Category Archives: Science

Tyres – The Invisible Ecological Menace

We have all heard almost to the point of frustration about climate change, pollution and how bad cars powered by fossil fuels are.

We are all exhorted to consider using an electric vehicle, or a hybrid so as to cut our carbon footprint, and stop climate change.

Obviously, all of this is deserving of support, and climate change is a very real threat, as is the increase in health problems as a result of the toxic gases in vehicle exhausts.

However, there is a sinister, yet little-publicised threat which may prove to be even more injurious to health and the marine environment, even if it has little impact on greenhouse gases and climate change.

Tyres.

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Yes, you did read correctly. Tyres are in the top ten of nasty pollutants that contaminate the world with micro-particles.

Tyres. Those innocuous black things attached to the wheel rims of your car, van, motorcycle, truck or bus.

We all know that tyres wear out – as we all have to buy them now and again, if we are to stay safe and legal.

So, what happens to the worn bits of tyre?  Well, they are eroded by the road surface and are released as micro-fibres, particulates that are fine enough to form as a dust on the road surface.

Subsequently, rain water washes these microfibres into the drains and sewage systems, where they ultimately make their way into the maritime environment – yes, rivers, lakes, reservoirs and oceans.

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Much publicity is generated around single use plastics in the oceans, but little publicity is around related to this almost invisible pollution.

Some of the particles are small enough and light enough to be dragged up off the road surface by the aerodynamic wake of passing vehicles, and may be suspended for periods of time, allowing them to be blown by the wind over quite large distances.

It is estimated that annually 68,000 tonnes of microplastics are generated by tyre tread erosion in the UK alone, with 7,000 to 19,000 tonnes entering the surface water system[1]. Research is currently being undertaken in the UK to deepen our understanding of the migration of tyre generated microparticles into the maritime environment.[2]

It may not be common knowledge but tyres are not constructed from pure natural rubber, but consist of 60-70% synthetic rubber – made with our old friends, the hydrocarbons, so the emitted micro-particles are not readily biodegradable.

Unfortunately, the qualities that makes tyres suitable, such as good grip, good braking qualities, and good car handling qualities rely on the tyre gripping the road surface through friction.

Friction between the road surface and the tyre tread actually causes the erosion of the rubber, and leads to the problem. The interaction also erodes the road surface, and any road marking paint on it too – but that’s another story!

Tyre particles vary in size and composition, so it would challenge even Agatha Christie’s Poirot to identify and track how these particles behave, and where they go once they have been shed.

Such particles will be dispersed widely around roads and byways, drifted by winds and the effects of vehicle aerodynamics, washed into various drains, culverts and waterways by rain.

Once in the water system the particles will exhibit different levels of buoyancy, and some will float onwards into estuaries and ultimately into oceans, and others will sink to the bottom and become part of the estuary sediment.

It is estimated that up to 10% of tyre wear particulate matter is released as airborne particles, which will settle over land masses, thus polluting them too.

What can we, the driving public do to minimise the effects of this?

Firstly, we can modify our driving behaviour to reduce the loads that our tyres are under.

We can make efforts to accelerate and decelerate gently and progressively, we can make sure the tyres are correctly inflated and remove un-necessary loads from the vehicle. This would help.

We could operate a smaller vehicle with a smaller engine and a lower mass.

This is a pipe dream, and we all know it. Unless governments intervene to legally force the use of smaller vehicles, we won’t trade our “Executive Urban Assault Vehicles” to sit in a minicar capable of reaching only 60 miles an hour with a following wind!

On my daily commute to work, I pass Farnborough Airport. This is the home to many ecologically-unfriendly executive private jet aircraft. The main A road that passes adjacent to it has recently had a new 50 mph speed limit imposed upon it, reduced from its previous 70 mph limit.

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It seems that the local council are keen to reduce emissions in the local area!

Regardless of this, vehicles still charge past me doing well excess of the new limit, and the police don’t seem to be enforcing the new limit.

Maybe we should drive less distances?  Maybe we should alter our fundamental mind set to become more locally focused, and adopty a new philosophy of not commuting longer distances?

I don’t think human nature is going to fix this particular problem.

It appears that the main thrust of the ecological argument is to initiate a societal shift from driving hydro-carbon powered vehicles to electrically powered cars.

However, this only addresses a part of the problem. Even if there is a global adoption of battery driven vehicles, the problems associated with the pneumatic tyre remain.

Until we have mastered an alternative to the conventional tyre we are still in trouble.

The auto industry faces a parallel challenge. What do we use as an alternative to the conventional vehicle tyre?

Answers on a postcard please…

 

[1] Friends of the Earth Report “Reducing Household Contributions to Marine Plastic Pollution 11/2018

[2] UK Government Funding for Research into Tyre Tread Erosion and Pollution

 

Elderly Drivers – Good or Bad – I Hope To End Up As One! (Or – Are They Safe?)

I parked the car, nonchalantly locking it with the keyfob, as I do every evening when I return from work.

It was a blustery, rainy late afternoon, and my journey home a relative nightmare. All of the major routes west of Heathrow Airport were in chaos. It seems that the average Brit is breathtakingly incompetent in wet conditions, despite bemoaning that its always raining here.

Either driving lunatically fast, or crawling along far too slowly, the result is multiple accidents, and long holdups. The delays were only made marginally tolerable by listening to the radio.

I decided that the solution to my grumpy mood was to pull my bicycle out of the. garage, and cycle the mile and a half to my alternate refuge, the Passfield Club.

It was only five past five when I arrived, and the place was almost deserted.

I ordered a pint of Fossil Fuel, and went at sat at a table at the far end of the room.

I was thinking about driving. Despite my journey, I knew that I was fortunate to be in a position to drive.

I have held a full licence since February 1977, almost 43 years. The car and motorcycle have become an intrinsic part of my life, and as a relatively fit man, I rarely think of the time when I too will have to hang up my car keys for the final time.

Before that time, I may have to downgrade my vehicle from the small SUV that I drive to a smaller vehicle. Maybe electric?  Who knows.

I recall hearing somewhere that many older people bought an automatic car after maybe decades of driving a manual gearbox car, and subsequently had an accident as a result of confusion over the foot pedals and their location.

 

Also, that older drivers were as dangerous as the young due to their worsening driving abilities.

I wondered if this really was an issue, so I decided to do some research, and here is what I discovered.

According to AXA Insurance’s Technical Director David Williams[1] drivers may face rises in insurance premiums as a result higher compensation claims being awarded following vehicle collisions and accidents.

The two age groups that will be affected most by this will be younger drivers in the 17-24 age group, and those over 75.

That surprised me a little.

Further digging revealed that there are an estimated 2.7 million drivers under the age of 25. Of that figure, 1.3 million are under 22. Combined, these groups make up about 7% of all UK drivers.

Drivers aged 17 -19 represent 1.5% of the driver population, yet they are involved in 9% of all fatal accidents in which they are the driver! Altogether, the under 25 age group are responsible for 85% of all serious injury accidents.

So where does this leave the older driver.

Bizarrely, a quick check of the stats[2] instantly confirms that drivers in the 17-24 category have a very high accident rate comparatively speaking, with 1,912 collisions per billion vehicle miles (CPBVM) travelled. The accident rate then progressively reduces as age increases, reaching its lowest point between the ages of 66 – 70 dropping to just 367 accidents CPBVM.

So, I am, in theory, becoming statistically less likely to have an accident, due to my relentless march into decrepitude.

The accident rate rises slightly thereafter, but peaks to its highest for the 81 – 85 age group – at a massive 2,168 CPBVM.

So, in overall terms, from age 60 to 70, not a bad record.

Some of the reduction may well be inked to the fact that older drivers travel less than other adults, with about half the average mileage covered.

 

Demographically, the older population is forecast to expand and the number of people aged over 65 in the EU is predicted to double between 2010 and 2050.

Now a quick look at the science.

Aging brings with it several inescapable changes, including sensory, psychomotor and cognitive reductions – failing eyesight and hearing, slowing reactions, and slower and impaired judgement.

The higher reported fatality rate for older drivers is due to increasing frailty leading to death in a collision that would have potentially only injured a much younger driver.

Current UK legislation requires that driving licences are renewed when an individual reaches 70, and are valid for three years before requiring to be renewed again. This is a sensible approach.

When combined with requirements placed on medical practitioners to advise the UK Driver Vehicle Licencing Agency of any medical condition which would require the revocation of a driver’s licence.

But us oldies are fighting back!

It would appear from several studies that there is an almost compensatory mechanism at work, and older drivers are good at making sensible adjustments to their driving, and adapt their driving to reduce their exposure to higher risk driving conditions.

Many will stop driving at night, or will adjust the times of day or the days of week on which they travel.

Now – back to my original thoughts.

As an individual with no formalised forensic vehicle accident training, I accepted at face value the statement that elderly drivers should not drive cars with an automatic gearbox.

road-safety-character-elderly-driver

Surprisingly, my research seems to indicate the opposite, and a number of reports actually suggest that older drivers should use an automatic car.

In fact, a Dutch study was conducted by the University of Groningen using a professional driving simulator. The research placed young and older drivers in both an automatic transmission car and a car with a manual gearbox. The subjects were then required to drive several routes, including rural roads, rural roads with random varied intersections and finally a route that necessitated joining a busy motorway, overtaking vehicles and then exiting safely at a junction.

The results were interesting, in that the older drivers performed better in an automatic gearbox car than a manual.

This is possibly because the time lag induced by the age-diminished psycho-motor skills to both brake and shift down the gearbox simultaneously impaired driver performance. This was discussed as far back as 2002[3], where research suggested that older drivers should, in fact switch to driving an automatic car.

Interestingly, even the younger drivers in the sample also performed better when driving an automatic.

I accept that there needs to be a safe transition period, so maybe when drivers get to 65, when they are statistically at their safest, they should change to an automatic car, so that they have a few years to adapt to the differences, so that they may benefit from the additional levels of safety that a car with an automatic gearbox provides.

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So, in six years, I will get my electric car, which will not only be cleaner in terms of emissions, but may even help me to stay alive a bit longer!

Mark Charlwood© January 2020

[1] Article Click4Reg April 2017

[2] Older Car Drivers Road Safety Factsheet (2016 data) Published May 2018

 

[3] Warshawsky-Livine & Shinar (2002)

A Smooth Skin Can Save Serious Money

Non-Stick Vehicles
A good way to save money

Every woman knows that unblemished skin is essential to looking good.

In modern vehicle aerodynamics, not only does a smooth skin look good, but it can also save large amounts of money for the owner or operator.

The aviation industry has been aware of the importance of a smooth finish for many years, and has developed many ways of reducing skin friction. Flush rivets and streamlined fairings go a long way to increasing achievable airspeed and reducing drag (and therefore fuel burn).

The latest generation of transport aircraft now increasingly use composite materials such as carbon fibre to construct airframe components. Such materials offer two main advantages – a high strength to weight ratio, combined with the ability to be joined using high technology adhesives rather than rivets.

However, an aircraft in line service becomes dirty over time, and the dirt particles accumulate to cause a breakdown in the airflow over the wing surface, thus increasing drag. Paint finishes also start to blemish and break down, causing further erosion of the erstwhile smooth finish.

This is where the relatively new science of Nanotechnology offers significant improvements to aerodynamic performance.

Nanotechnology is defined as “The manipulation of matter at an atomic or molecular level.” The standard unit of measurement is the nanometre, which is defined as being one billionth of a metre. To put this into context, an atom of Helium measures about 0.1 nanometres!

Developments in this field have enabled the production of commercially available coatings designed to bond to a vehicle structure, forming a perfectly smooth coating which prevents the accumulation of dirt and debris and helps to shed water, and protect paintwork.

The process for applying the nano-emulsion is simple.

Firstly, the airframe is thoroughly cleaned, and then treated with an acidic solution which has the effect of positively polarising the surface. This enables the nano-emulsion to completely bond with the structure.

The final stage is applying the coating itself. Once cured, the coating is fully bonded to the surface.

The fully cured coating is extremely thin – 100 times thinner than a human hair, and the total weight of the treatment adds just four ounces (113g) to the weight of the aircraft.

It is estimated that a treated aircraft will return a fuel saving of somewhere between 1% and 2%!

A number of airlines have been quick to evaluate these products. In 2011, EasyJet, grasped the opportunity to run trials, and had eight of their aircraft treated with the nano coating.

A carrier such as EasyJet’s fuel bill will represent about 40% of its total costs, and be in the region of £750,000,000 ($1,185,000,000) per year. A 1.5% saving on this figure is a massive £11.25 Million per year. As fuel prices only ever go up, these figures are just a start.

There are also additional hidden savings, as treated aircraft will need washing and repainting less frequently.

Another significant saving may be made on the amount of green taxes incurred by the operator. In Europe, these taxes are quite high, and a drop in fuel burn results in a proportional reduction in greenhouse gases.

Recently, British Airways announced that they are conducting a trial on a Boeing B777-200, and is hoping to see cost saving in excess of £100,000 in the year long evaluation.

This technology is not just limited to aircraft operators. The coating is equally effective in a marine environment, and coating ship hulls will improve hydrodynamic qualities.

Road vehicles can also benefit from improvements to their aerodynamics and haulage operators with a large fleet may well be able to enjoy cost savings as well.

So our womenfolk were right all along. Smooth is essential!

I Feel The Need….. The Need for Speed!

The sun streamed through the slightly dusty windows of the Alton branch of Costa Coffee, as I sat enjoying my coffee, catching up with the news, both digital and conventional.

 

An article caught my eye about road safety, so, having had my curiosity piqued, I conducted some research which I found very interesting, and in the spirit of friendship and understanding, I offer my thought to you, gentle reader.

 

Speed Cameras. Love them or loathe them, they do serve their purpose, which is reducing speed, and increasing safety. However, adherence to the speed limit isn’t the sole factor that a driver is monitoring, particularly when driving in heavy traffic, or demanding road conditions. Distraction management is not a skill that is taught during driving lessons, and maybe it should be.

 

It would appear that most Police Authorities are aware of this weakness, and allow for a tolerance in speed keeping, to ensure that motorists are not penalised unfairly for a momentary breach of the speed limit.

 

Most police forces in the UK have confirmed that they allow for a 10% error plus a 2 mph additional tolerance to account for minor lapses in driver speed control. This is an agreed standard set by the National Police Chief’s Council.

 

As far as I am aware, this margin was originally put in place to account for the inaccuracies of early speedometers, which were cable driven from either a gearbox on a road wheel, or from the vehicle transmission gearbox. I have also heard anecdotally, that the additional 2 mph was to account for what we could call distraction error.

 

A recent Freedom of Information request made by Auto Express© (www.autoexpress.co.uk) to UK police forces confirmed that 22 constabularies adhere to the guidelines, and cameras are calibrated to trigger at the posted speed limit plus 10% + 2 mph (i.e. in a 30 mph limit, a camera will trigger at 35 mph, in a 40 zone at 46 mph etc)

 

The remaining eight constabularies declined to offer full details of the trigger tolerances, which is a shame, but understandable.

 

According to a study conducted by the London School of Economics and Political Science, [1] speed enforcement cameras reduced accidents by between 17 to 39 per cent, and reduced fatalities by between 58 to 68 per cent[2], so they are definitely an effective measure in improving safety.

 

Interestingly, speeding accounted for 60 per cent of all fatal accidents in the UK in 2015.

 

However, whilst the cameras reduced accidents within 500 metres of the site, accidents outside the camera zone increased, as drivers either braked suddenly to ensure they were in compliance with the limit, or accelerated heavily once outside the camera’s operational range.

 

As a result of this behaviour, more and more speed limits are now enforced with average speed cameras, which ensure compliance over a greater distance, and without the related dangers of braking and accelerating in the locality of the speed camera site. This works very well, as I can testify to.

 

One of my regular routes takes me up the A3 towards London. Just south of Guildford, the national 70 mph limit drops to 50 mph, in the area known locally as Wooden Bridge. Up until recently, it was almost impossible to maintain 50 mph in safety due to aggressive tailgaters, dangerous filtering and regular high speed lane changes and sudden lane changes.

 

A few weeks ago, Average Speed Enforcement was activated, and as a result, most drivers now comply with the 50 mph limit, and aggressive tailgating is negated by the need to maintain 50 mph.

 

Human behaviour, being what it is, means that wherever it appears safe to breach the rules, then a driver will consciously break the limit. I admit that on an empty motorway, I often take a calculated risk and drive at 80 or 90. I have done so on a number of occasions, when my experience and perception indicates to me that it is safe to do so. I say that with the benefit of 42 years of driving experience, both on motorcycles and in cars.

 

It often appears that the authorities are willing to reduce speeds when appropriate, but not to increase speeds when the conditions warrant it.

 

Across the EU, they take a sensible and pragmatic approach. In France for example, I have seen a limit of 130 kph (81mph) with a further sign reducing the limit to 110 kph (68 mph) in rain.  Across the Netherlands, the Autoroute limit is 130 kph as well, so 10 mph faster than the maximum speed limit in the UK. So much for EU unity!

 

As it appears that drivers are incapable or unwilling to abide by speed limits, which to be fair, are generally there for the safety of all road users, the EU is now is now mandating that all vehicles manufactured after 2022 will be fitted with Intelligent Speed Adaption (ISA).

 

There is currently a lot of mis-information about what is perceived as external speed control. ISA is designed to complement the driver’s speed keeping discipline, and will intervene should the speed limit be exceeded.

 

ISA is an onboard system that tracks the vehicle’s position by GPS, and compares the co-ordinates with a speed limit database. The system then continuously monitors the vehicles speed.

 

ISA will be designed to offer three modes of operation.

 

At the most basic level, should ISA detect a breach of the posted limit, an audio/visual warning will be generated to alert the driver. This is referred to as an “Open” system. This is an advisory system only, and the driver may choose to ignore the system-generated warnings.

 

Should the authorities decide that the system should be more robust in its levels of intervention, then either a “Half Open” or “Closed” system will be mandated.

 

The Half Open system will be designed to provide force-feedback through the accelerator pedal should the posted limit be exceeded, thus giving the driver not only an audio/visual warning, but a sensory input that actively resists the foot pressure delivered to the accelerator. The driver would then have to consciously make an effort to overcome the feedback pressure. This enables a driver to breach a posted limit in the event that an emergency condition dictates it.

 

Lastly, is the “Closed” system, which actively prevents the speed limit being exceeded, and gives the driver no means of intervention

 

There are obviously drawbacks to the ISA as a system.

 

Firstly, there is a risk that further automation of the driver’s interactive functions will reduce the level of awareness and involvement, potentially leading to a reduction in attention to road and traffic conditions. Loss of awareness is highly dangerous, and could in itself lead to further accidents.

 

Secondly, once a driver has accepted the use of such a system, there may be a tendency to become over confident, with a perception of invulnerability as the system effectively manages maximum speed. However, as the system only monitors compliance with the maximum speed, the driver needs to remain involved and “in the loop” as conditions may dictate a much lower speed for safety.

 

Some drivers may also become frustrated at the system holding them at what they consider to be a speed that is too low for safety, especially where speed limits have been set arbitrarily rather than as a result of evidence based decisions. This may result in risk based behaviour.

 

 

 

So, vehicles are becoming much more automated, and much work needs to be done on developing that man-machine interface.

 

I am so glad that I enjoyed driving as a young man during the years when there were no speed cameras. As a country teenager, I took my chances with getting caught by the police whilst rocketing around the lanes of Sussex at lunatic speeds. I was lucky that I enjoyed this without sustaining a crash, injuring or killing anyone else, and without receiving any driving bans.

 

This is a privilege that is denied younger drivers now.

 

Brave new world?

 

 

You decide.

 

 

Mark Charlwood© May 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[1] Figures from 1992 – 2016 Cheng Keat Tang PhD

[2] Within 500 metres from the camera site

Can Underpants Contribute to Sustainability?

My Mother always used to tell me when I was a child, that I must wear clean underwear every day. Her justification for this advice, was that I wouldn’t be embarrassed if I had an accident, and got taken to hospital. Strange logic, maybe, but I grew up with the healthy habit of wearing clean underwear every day.

 

This offers two benefits to society.

 

Firstly, it reduces the chances of body odour, and secondly, ensures that any bacteria and microbes that accumulate in the old under-crackers are reduced to a much lower level that they would be if one were to wear them for days on end.

 

Having said that, the wearing of clean underwear every day takes its toll on the environment.

 

A report conducted by Yates and Evans[1] found that 12% of domestic electricity demand, and 13% of mains freshwater demand in UK homes was for laundering.

 

Further reports suggest that an average washing machine will consume 17,160 litres of water per year, and given that the average household uses their machine 270 times per year, that’s a massive 63 litres every time the machine is used!

 

Apparently, according to the UK’s Daily Mirror[2], the average UK man owns 13 pairs of underpants in total, buys new pants once every six months spending an average of £20.75 a year on them. Interesting?  Maybe not, but stick with me…

 

Now the same article also goes on to explain that shockingly, 10% of my fellow men wear their shreddies for seven days before washing them. YUK! Un-hygienic for sure, and probably not likely to make you irresistible to the ladies!

 

Society is stuck on an unsustainable track – The garment industry manufactures clothing, we buy it, use it, wash it, use it, wear it out, throw it away, and then buy more, and so the cycle goes on.

 

Interestingly, the textile industry is one of the major contributors to pollution and the generation of CO2. According to a report by the Ellen MacArthur Foundation the textile industry’s share of the carbon “budget” will increase from 2% in 2015, to 26% by 2050.

 

Manufacturing textiles is also greedy of other resources. In 2015, the manufacture of textiles consumed 98 million tonnes of oil. By 2050, this will have increased to 300 million tonnes, (always assuming there will be any left by then!)

 

A chilling by-product of manufacturing clothing, is the addition of an estimated 23 million tonnes of plastic microfibres into the world’s oceans.

 

We should be doing all that is possible to reduce the amount of new garments that are coming into existence.

 

I am not advocating that we extend the use of underpants creatively with a wearing pattern such as day one right side out, day two inside out, day three back to front etc., but there is a new alternative.

 

But there is hope.

 

Organic Basics is a Danish company that has been developing sustainable fashion, and designing clothing that impacts far less on the environment.

 

By using silver thread within the construction and weave of their range of pants and socks, they have extended the wear to wash interval hugely – and laundering a pair of pants just twice a month is now possible!

 

This is all down to the use of silver, which kills 99.9% of bacteria, and is used as an anti-bacterial filter by NASA in space travel.

 

The garments are made from 100% recycled materials most of which is recovered from post-industrial waste such as fibre, yarns and waste from weaving companies. Furthermore, they are fully approved by Bluesign, an organisation supporting a sustainable textile industry.

 

However, sustainability does come at a cost – in this case two pairs of men’s Silvertech® Boxers costs a whopping €56.00 (£48.56 as at 24/01/2019) so this may put them out of reach of many individuals.

 

There is light at the end of the tunnel though. A recent study by Nielsen showed that 66% of global consumers are willing to pay more for ethically sourced and sustainable products. In the case of millennials, this rises to 73%.

 

So, the question remains –

 

Will my Mother’s advice still hold good?

[1] Dirtying Linen: Re-evaluating the Sustainability of Domestic Laundry (2016) University of Manchester (UK)

[2] Daily Mirror, 21/04/2016

Have a Safe(r) Flight!

So, you are going on holiday. Fabulous! You have packed your clothes for your two weeks away, you’ve bought your travel insurance, reserved a rental car, and still have a sore arm from getting the necessary inoculations and vaccinations.

But how much thought have you given to your personal safety on board the aeroplane?

If you answered “none” to this question, then you are part of the huge majority of air travellers who arrive at the airport blissfully ignorant of the potential risks attached to their chosen mode of travel.

Air travel is an extremely safe and efficient way of getting to distant places. Statistics seem to support this, including the oft-quoted “You are safer flying than you are driving in a car to the airport”  Whilst this may have a degree of accuracy, the fact still remains that aircraft accidents do still happen, some of which are serious. With a little care and forethought, you can reduce your exposure to these possible risks, by taking some simple steps yourself.

So, back to my question. How much thought have you given to your personal safety on board the aeroplane?  Or, to put it another way, when do you start thinking about your on-board safety?  A week before travelling? The day before? When you are sitting in your seat, waiting to take off?

Modern airliners are generally very reliable, but there are phases of flight that are more dangerous than others. Interestingly, more aircraft accidents occur during take off and landing than at any other time of flight. This is particularly true in some of the less developed countries around the globe, where flight safety is degraded as a result of under-investment.

In the highly unlikely event that the aircraft should suffer a serious in-flight problem, an emergency landing may be needed, and it may be necessary to “abandon ship” down the escape slides. There may be limited time for the cabin crew to prepare you for doing this, so you need to think a little about the slides.

The slides are made of a very tough neoprene, and are inflated automatically should a door be opened once the aircraft has left the gate. Naturally, you will have been requested to watch the safety demonstration, and refer to the safety card, but the vast majority of you will have been far too busy reading the newspaper, and listening to your iPods to have done so!

The reason that I mention this here, is that despite the instructions to remove high heeled shoes, and to leave bags behind during a slide evacuation, some individuals still place more value on their laptop computer and their bottle of duty free than on their own lives, or those of fellow passengers!

Amazingly, during a fairly recent evacuation of a Boeing 777 in Houston, passengers were observed jumping down the escape slides carrying their wheelie bags, bottles, and other bits of variegated hand baggage. Selfish and stupid in equal measures!

You may then have to walk across broken glass and damaged suitcases once you get off the slide.

For that reason, you should consider what you would wear on the flight. Stout, flat-soled yet comfortable footwear such as Deck Shoes, Moccasins, Training Shoes, and Flat soled business shoes are a must. I recommend that you resist the temptation to remove these shoes and put on the in-flight socks until the take off and climb is completed and the aeroplane is safely in the cruise.

Approaches and landings carry a higher statistical risk of emergencies, so you should put your “sensible” shoes back on at the top of the descent. This is normally indicated when you hear the engine note diminish as the power is reduced, about 30 minutes before arrival time. You may also hear a passenger announcement from the pilots at this point.

I also recommend that you invest in a simple body belt, so that you can carry your passport and travel documents easily. Its more practical than carrying them in a shirt or blouse pocket, and it may save you being delayed if you do have to evacuate the aeroplane.

Those passengers who have footwear and a passport may be swiftly re-booked onto another flight. Those who don’t will probably have to wait for some time in the airport until their passports and belongings have been collected by airport staff.

Your last consideration before leaving home for the airport should be the rest of your clothing, and the material from which it is made. I recommend that you wear clothes produced from natural products, such as cotton.

These materials may burn in the event of fire, but they will offer you more protection from flames than man-made fibres such as Nylon, which is highly flammable.

Now, lets consider your flight. You have boarded the aeroplane, and have been welcomed aboard by a smiling Flight Attendant. Soft background music will be playing, and you will shuffle to your allocated seat. This is easy in a well-lit cabin.

Now imagine the same cabin, darkened, filled with smoke and full of passengers. Your ability to see will be severely limited. Therefore, you should count the number of seatbacks that you pass on your way to your seat. This will enable you to locate the exits in poor lighting conditions should you need to escape from the aeroplane in an emergency.

Once at your designated seat, you should stow your carry-on baggage in the overhead lockers.  Nothing could possibly go wrong with this.  Or could it?

This is an area for concern. The overhead lockers are not designed to carry very heavy items, yet passengers are often observed struggling to lift huge sports bags and holdalls, boxes, and even very heavy cases into the overhead locker above your seat.

In the event of a forced landing, these lockers may deform, resulting in the doors springing open, thus allowing the contents to fall on the passenger below – in this case you!

If you feel unhappy about the load in the overhead stowage, talk to a crewmember and ask, or even insist that the bag is removed from the overhead, placed in another locker, or put in the aircraft hold.

Now, before you sit down, you should use the opportunity to have a quick check of the area around your seat. Find the lifejacket stowage, and check that there is a lifejacket in it!

It may surprise you, but it is a sad fact that every summer, I witness passengers walking off aeroplanes with life jackets stuffed in their hand baggage. Not only is this a criminal act, it is also a very selfish one, bearing in mind that the jacket is safety equipment, and could potentially mean the difference between survival and death.

It is a legal requirement that a life jacket is available for each seat, and the aircraft will not depart until you have one – even if the only water you will fly over is the Manchester Ship Canal!

Most reputable European, North and South American and Australasian airline’s aircraft engineers will always check that every seat has a life jacket before the aircraft operates its first flight of the day. However, you may be flying on the third, sixth, or even the twelfth sector, so its always possible that someone has stolen the jacket as a souvenir since the engineering safety check.

Furthermore, you may be flying to a remote region on a carrier operated by a small and under-developed country. There is no guarantee that these checks have been performed, so you should take a peek to make sure that you have a lifejacket.

Once the aircraft is safely away from the gate, and starts taxying to the runway, the safety demonstration commences. This will consist of either a pre-recorded film, or a demonstration given by the cabin attendants.

I strongly urge you to watch the film or demonstration. You may be a regular traveller on a Boeing 737, or an Airbus, but each airline will have a different seating layout, different emergency lighting systems, and different types of safety equipment, so assuming that you don’t need to watch the demonstration is dangerous complacency.

Numerous safety items are covered on the safety demonstration; how to fasten and release your safety belt, how to use the drop down oxygen masks, and how to fit and secure a life jacket. You will also be advised to read the safety card, which will either be contained in the seatback pocket, or in some cases, riveted to the seatback in front of you.

The reason that you are instructed to read the safety card, is that it will contain information that the safety demonstration doesn’t cover. This will include how to open the doors and emergency escape hatches, and how to adopt the correct “brace” position in the event of making an emergency landing.

Pulling this card out to read it as the aircraft is skidding to a stop in a field is a little late in the day – so please read the information on the card whilst you are taxying out.

You may feel justified in ignoring the safety demonstration for numerous reasons. I was recently presenting a safety course and I asked a frequent flyer why she chose to ignore the demonstration. Her response was a common one: “It’s a bit patronising – any fool knows how to fasten a safety belt” Her frequent flyer colleagues all nodded their agreement.

Most passengers will be highly familiar with the operation of a seat belt, as they use one every day whilst driving the car. Think about where the belt release is. Its down by your hip.

Now, where is the belt fastener on an aeroplane? Its in the middle of your stomach.

Bodies have been recovered from wrecked aircraft, bearing trauma wounds to the hips, where the victim’s hands have been scrabbling to find the belt buckle that was in fact sitting in the middle of their stomach.

Some of these individuals survived the crash, only to be suffocated in smoke because they were unable to undo their seatbelts. Reviewing the operation of the seatbelt in the safety demonstration is done to remind passengers that the belt is different to the ones that they may be more familiar with.

You will also be shown how to put on and use the cabin emergency oxygen system.

Aircraft are pressurised to give a comfortable environment similar to normal air pressure at about 8,000 feet.

Very occasionally a fault may cause a drop in cabin pressure, and the air may become too thin to breathe comfortably. Therefore, oxygen masks will automatically drop from cubbyholes overhead each passenger seat. It is important that you put the mask on quickly, as it is possible to lose consciousness for a brief period if you don’t.

Many aircraft use chemical oxygen generators to produce oxygen, as it saves the requirement to carry large metal tanks. When activated, these generators combine two chemicals to produce oxygen, which is then delivered by a plastic tube to the mask. A by-product of this reaction is heat.

The generators are located in compartments built into the overhead lockers. Over time, they will be covered in a layer of dust. This dust heats up, and creates the smell of burning. This may create panic, as some passengers will assume that the aircraft is on fire.

So, what may happen in reality?

You may feel a slight popping in your ears and the cabin may start to become quite chilly. This is to be expected if the cabin altitude is rising. At some point the safety systems will detect the falling pressure, and the oxygen masks will automatically drop out of their stowages under the overhead lockers.

You may hear a pre-recorded passenger announcement that reminds you to put your mask on, and informs you that an emergency descent has been started.

If you have paid attention to the safety demonstration, you will have already grabbed the nearest mask, and will have put it on. The air flows as soon as the rubber tube is pulled.

Don’t worry about pulling the mask out of its connection to the air supply – the rubber tube is very strong and secured very tightly, and you do need to pull the mask firmly in order to start the oxygen flow.

Whilst this is going on, the Pilots will be doing their emergency drills. They will have donned their masks, and will have immediately put the aircraft into a fairly steep descent to get the aircraft quickly to an altitude where the air is breathable.

Modern aircraft wings are designed to create as much lift as possible, but lift is now the last thing that is needed. The pilot will have extended the speed brakes, which are large hydraulically operated panels located on the top surface of the wing.

Once these are lifted up into the airflow, they interfere with the lift, and the rate of descent is now much faster. They also cause some turbulence and noise, and this may add to the sense of alarm in the cabin.

However, you must remember, that the apparent feelings of being in extreme danger are deceptive, and whilst this is an emergency situation, you will be quite safe. Aircraft depressurisation is practiced by the crews regularly in the flight simulators, and is relatively easy to handle and resolve.

The last item that is normally demonstrated is the use of the lifejacket. Lifejackets are generally similar in operation regardless of manufacturer or airline. They will be simply placed over the head, and either tied around the waist with canvas cords, or secured with nylon webbing and plastic snap fasteners.

They are inflated by pulling a toggle on the front of the jacket, which discharges a CO2 cylinder into the jacket.

Although lifejackets are designed to have no “inside” or “outside” they are best worn with the CO2 cylinder outside, as the metal cartridge becomes very cold after discharging the gas, and may cause burns if left touching the skin. It is imperative that jackets are not inflated inside the aircraft cabin, as they will either get ripped, or will cause obstructions in a densely packed cabin.

Should you forget this, and fire your jacket early, you may deflate it easily by unclipping the inflation tube (the one that is normally used for topping up the jacket by mouth) and pushing your finger into the tube end. Inside is a Schrader valve similar to that used on a car tyre. Simply press the stud in the middle and compress the jacket to deflate it. Once outside the aircraft cabin, two or three deep breaths should re-inflate the jacket to the point where it will support you in the water.

If you are instructed to put on your lifejackets, then there will be an element of panic throughout the cabin. I strongly suggest that after you have donned your jacket and tied or buckled it up, you briefly release your seat belt and stand up!

It will be too late to discover that you have tied the jacket (and yourself) to either the seat frame, or your fellow passengers once the aircraft has ditched. Doing this ensures that the jacket is secured, and that you can still exit the aircraft when required to!

Aircraft typically have an approach and landing speed of anything from 150 knots (130 mph) to about 120 knots (105 mph) but in an abnormal or emergency situation this could be higher. As you will appreciate, under the rapid deceleration of an emergency landing, anything not secured in the cabin will become a projectile, and will travel through the cabin at very high speed. This will include unsecured items of hand baggage, food carts, and other pieces of aircraft equipment.

Aircraft structures are designed to withstand loads of up to nine times normal gravity, but under a crash landing scenario, these limits may be exceeded, and the cabin may start to deform during the deceleration.

The safety card will contain details of the correct brace position to be adopted should a forced landing need to be made. The brace position is designed to minimise the whiplash effects of rapid deceleration, and to protect the head from injury.

Some authorities suggest that bending forwards, and clasping your arms under your thighs will offer the best chances for survival. I personally prefer the brace position used by British Airways. This brace position is adopted by leaning as far forward as possible, and placing your hands over your head.

You should then place your feet flat on the floor, and move them backwards until they touch the baggage restraint bar under your seat. This will guarantee that your feet are behind the line of your knees, thereby ensuring that your legs won’t swing forwards under deceleration loads, and smash your shins into the seat structure in front of you.

I also suggest that although it is a natural tendency to interlace your fingers when you place your hands over your head, that you don’t do it!

If you are right handed, place your right hand on your head first, and then protect that hand by placing your left hand over the top of it. This will make certain that even if the baggage lockers above your head collapse onto your hands, you will not have all your fingers broken and will still be able to unfasten your seat belt, and still have the use of your good hand.

Taking your dream holiday trip of seeing Orang-Utans in the wilds of Borneo or Indonesia, may well involve a considerable amount of flying with air carriers of dubious or unknown quality. You wouldn’t travel without insurance or vaccinations – so surely investing fifteen minutes to watch and understand a safety demonstration is time well spent!

Now, its time to take a reality check.

According to the UK Civil Aviation Authority, during the period from 1992 – 2001, UK airlines carried 802 million passengers with no fatalities!  Quite an impressive record in fact.

The biggest UK Airline operates 285,000 flights per year. Over the last five years, they have only had to evacuate an aircraft on two occasions. These evacuations were only conducted as a safety precaution, rather than as the result of a cabin fire. This means that statistically speaking, you stand a one in 712,500 chance of having to evacuate an aircraft.

To put that further into perspective, The UK’s Health and Safety Executive estimate that the chances of you dying as a result of an aircraft crash are one in 125,000,000 passenger journeys. In fact, they calculate that you stand a one in 16,800 chance of being killed in a road traffic accident.

So, you are relatively safe in the air – but how safe are you once you check into your hotel? Do you know the risks? Have you thought about your welfare? This will be covered in a later posting.

 

Smooth Skin Can Save Serious Money

Non-Stick Vehicles
A good way to save money

Every woman knows that unblemished skin is essential to looking good.

In modern vehicle aerodynamics, not only does a smooth skin look good, but it can also save large amounts of money for the owner or operator.

The aviation industry has been aware of the importance of a smooth finish for many years, and has developed many ways of reducing skin friction. Flush rivets and streamlined fairings go a long way to increasing achievable airspeed and reducing drag (and therefore fuel burn).

The latest generation of transport aircraft now increasingly use composite materials such as carbon fibre to construct airframe components. Such materials offer two main advantages – a high strength to weight ratio, combined with the ability to be joined using high technology adhesives rather than rivets.

However, an aircraft in line service becomes dirty over time, and the dirt particles accumulate to cause a breakdown in the airflow over the wing surface, thus increasing drag. Paint finishes also start to blemish and break down, causing further erosion of the erstwhile smooth finish.

This is where the relatively new science of Nanotechnology offers significant improvements to aerodynamic performance.

Nanotechnology is defined as “The manipulation of matter at an atomic or molecular level.” The standard unit of measurement is the nanometre, which is defined as being one billionth of a metre. To put this into context, an atom of Helium measures about 0.1 nanometres!

Developments in this field have enabled the production of commercially available coatings designed to bond to a vehicle structure, forming a perfectly smooth coating which prevents the accumulation of dirt and debris and helps to shed water, and protect paintwork.
The process for applying the nano-emulsion is simple.

Firstly, the airframe is thoroughly cleaned, and then treated with an acidic solution which has the effect of positively polarising the surface. This enables the nano-emulsion to completely bond with the structure.

The final stage is applying the coating itself. Once cured, the coating is fully bonded to the surface.

The fully cured coating is extremely thin – 100 times thinner than a human hair, and the total weight of the treatment adds just four ounces (113g) to the weight of the aircraft.

It is estimated that a treated aircraft will return a fuel saving of somewhere between 1% and 2%!

A number of airlines have been quick to evaluate these products. In 2011, EasyJet, grasped the opportunity to run trials, and had eight of their aircraft treated with the nano coating.

A carrier such as EasyJet’s fuel bill will represent about 40% of its total costs, and be in the region of £750,000,000 ($1,185,000,000) per year. A 1.5% saving on this figure is a massive £11.25 Million per year. As fuel prices only ever go up, these figures are just a start.

There are also additional hidden savings, as treated aircraft will need washing and repainting less frequently.

Another significant saving may be made on the amount of green taxes incurred by the operator. In Europe, these taxes are quite high, and a drop in fuel burn results in a proportional reduction in greenhouse gases.

Recently, British Airways announced that they are conducting a trial on a Boeing B777-200, and is hoping to see cost saving in excess of £100,000 in the year long evaluation.

This technology is not just limited to aircraft operators. The coating is equally effective in a marine environment, and coating ship hulls will improve hydrodynamic qualities.
Road vehicles can also benefit from improvements to their aerodynamics and haulage operators with a large fleet may well be able to enjoy cost savings as well.

So our womenfolk were right all along. Smooth is essential!