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PostPosted: Thu Oct 04, 2007 22:14 
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RobinXe wrote:
Paul_1966 wrote:
The reasons for having belts on an airplane are so different from those on a car that there's no valid comparison between the two.


Um, what?

This is another comment I feel you're going to have to justify.

Why do you think there are belts on aircraft then?


In an aircraft the main use to to keep you in your seat if there is turbulance or violent manouvres.


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PostPosted: Thu Oct 04, 2007 22:51 
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semitone wrote:
RobinXe wrote:
Paul_1966 wrote:
The reasons for having belts on an airplane are so different from those on a car that there's no valid comparison between the two.


Um, what?

This is another comment I feel you're going to have to justify.

Why do you think there are belts on aircraft then?


In an aircraft the main use to to keep you in your seat if there is turbulance or violent manouvres.


Riiiiight, not quite.

Their purpose is exactly the same as in a car, to overcome inertia in the event that the vehicle changes velocity.


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PostPosted: Thu Oct 04, 2007 23:39 
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semitone wrote:
In an aircraft the main use to to keep you in your seat if there is turbulance or violent manouvres.


If that's the case, they test them to one hell of a load! I'm pretty certain that although they will certianly do that AS WELL, they are primarily intended to restrain you in a crash. Obviously not maximum airspeed into the side of a mountian, but a more survivable sort of crash - like a ditching, crash landing or taxiing crash


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PostPosted: Thu Oct 04, 2007 23:50 
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smeggy wrote:
The problem is that when seat belts were first widely used (became legally mandatory in 1982, then 1991 for rear seated adults) there was nothing else for occupant restraint/protection, like: crumple zones, multiple airbags, deforming components, impact protection. I would guess that everyone at that time would have accepted that the benefits of belting up seriously outweighed the associated problems. Now many cars have these other safety features, hence it’s reasonable to re-evaluate their effectiveness when used within a modern car.


Semitone has already pretty much answered this but I'd just like to add that (especially in European cars), the airbags are NOT designed to replace the belts but to work with them. As Paul 1966 frequently complains, it is possible for a belt to inflict injuries - serious ones. There comes a point when you're simply asking too much of it (or too much of your body, strictly speaking)! One solution is to not bother with the belt at all and take your chances on whatever else brings you to a halt -(at least you won't die of belt-inflicted injuries)! A better solution (in my view) is to limit the amount of force that the belt can exert on you and then put a small airbag in to try and make up the difference. That way, the belt restrains you as much as it can without doing you serious damage and the airbag / car interior does the rest. Obviously, it is possible to exceed the limitations of both devices but that's pretty much as good as it gets with current technology!


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PostPosted: Fri Oct 05, 2007 00:01 
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Paul_1966 wrote:
I think there are multiple reasons auto manufacturers start fitting certain things, either as options or as standard (often starting as the former and gradually becoming the latter).

Go way, way back in motoring history. Why did manufacturers start fitting vacuum ignition advance and electric starters? Probably because they saw that these options would be popular with a lot of people, which they were.

Why did they start providing electric turn signals as an optional extra? Because it was sold to people as being far mroe convenient that winding down the window to give a hand signal, and of course it then became mandatory for signals to be fitted in later years, but even if that had not been the case, I think they'd have probably become standard fitments automatically because people would come to rely upon them and would not want to be without them, any more than anyone today would want to go back to hand cranking and making manual adjustments to the ignition timing.

But we don't have to look very far to see plenty of instances, especially in more recent years, of things which have really only become standard fitments because of legislation.

Rear fog lights anyone? Sure, they were around as options before U.K. law mandated them on new cars, but for something which was simply not that popular an option, would they have become standard features due to popular demand in the way that electric starters and turn signals had? I very much doubt it. They're only fitted on new cars here today because EU regulations demanded it.

And relating this somewhat to seat belts, the same could be said for the seat belt buzzer/warning light on all new U.S. vehicles. Fitted by popular demand? No -- Fitted only because they're now required by Federal law. People who wanted to use belts would buckle up anyway and those like me who don't will soon disable the annoying warning devices.

So I think there's quite a division between things which have become the norm due to public demand and those which have become the norm because of legislation or other business influences.


But your history doesn't add up!

Volvo were offering belts as an option in the late 1950s! Most manufacturers were doing it in the early 1960s - LONG before anyone made them a legal requirement! So what was in it for them? Well, they must have offered them because people were willing to pay for them!

As for electric start etc, the benefits of something that makes the occupants' lives easier / more pleasurable were traditionally very easy to sell. Safety devices were not as easy to sell because you get no benefit from them (if you're lucky) - perhaps for the entire life of the car! Even DESPITE that, they still sold to those with enough money to pay for them. All that making them a legal requirement does is ensure that they are provided for poor people who can't afford anything but the most basic specification in a car.


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PostPosted: Fri Oct 05, 2007 00:02 
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on commercial airliners I'm sure I heard an anecdote saying that they prefer you to wear the lap belt throughout the flight so that your body doesn't go flying around in the event of a crash so they can identify the body from the seat number?

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PostPosted: Fri Oct 05, 2007 00:08 
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Paul_1966 wrote:
The reasons for having belts on an airplane are so different from those on a car that there's no valid comparison between the two.

As for motorsport, although closer, even that is rather different from everyday driving on a public highway. It is much more controlled, driving conditions are totally different, there are emergency crews standing by who can be at a crash scene within seconds, etc.


No. I've already spoken about aircraft belts and I disagree with you. As for Motorsport, I don't think that motorsport is that different - just more extreme. Rally cars tend to have pretty much all the same crashes as road cars - just faster / harder. They tend to have harnesses which offer better protection than a 3 point belt but are more restrictive so having marshals around to help the competitors out of their belts is a good idea. The principle is exactly the same as in a road car though - the belt is something to stop you having to use all the sharp / hard bits of the car interior to slow you down!


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PostPosted: Fri Oct 05, 2007 00:20 
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Paul_1966 wrote:
And their reasons for claiming a difference in public service vehicles are.....?



Their reason is that as most Public Service Vehicles carry standing passengers (who, by definition are not belted up!) they can't very well discriminate against them by providing belts for the seated passengers!

The European Commission looked at the case for banning the carriage of standees (and mandating belts on bus seats) but decided against it. Now I know you think that legislators only do this sort of thing to opress us, removing our freedom of choice etc, but actually, they looked at the number of lives likely to be saved and found that (unlike cars) so few people die in bus crashes that it wasn't worth it. Public Service Buses are pretty slow and very big so they don't decelerate especially violently in most impacts. Unlike cars, therefore, belts were not deemed by the legislators to be likely to provide much benefit.


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PostPosted: Fri Oct 05, 2007 00:33 
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Mole wrote:
Paul_1966 wrote:
The reasons for having belts on an airplane are so different from those on a car that there's no valid comparison between the two.

As for motorsport, although closer, even that is rather different from everyday driving on a public highway. It is much more controlled, driving conditions are totally different, there are emergency crews standing by who can be at a crash scene within seconds, etc.


No. I've already spoken about aircraft belts and I disagree with you. As for Motorsport, I don't think that motorsport is that different - just more extreme. Rally cars tend to have pretty much all the same crashes as road cars - just faster / harder. They tend to have harnesses which offer better protection than a 3 point belt but are more restrictive so having marshals around to help the competitors out of their belts is a good idea. The principle is exactly the same as in a road car though - the belt is something to stop you having to use all the sharp / hard bits of the car interior to slow you down!

Pretty much concur with that, though there are a couple of further considerations peculiar to competition cars.

The first is that the belts have to bear more of the workload in the event of a crash than in a road car - rally cars don't have airbags as they'd continually fire off when going over violent bumps / "yumps", nor do they crumple as much as a road car due to the additional stiffness built into them in order to make them fit for purpose. Hence belts have to be bigger, stronger, and more restrictive than the equivalent road car ones.

The other principal difference is the intrusion of having a steel roll cage in the car to bang your head on in the event of. This is the primary reason that helmets are worn in rally cars, and again why the occupants have to be so much more solidly restrained with fixed belts rather than "inertia reel" arrangements that allow more freedom of movement.

The net result of all this is that the such restraint systems are hugely more effective. My last rallying crash was head on into a dry stone wall at about 45mph. In a road car that would have been a big accident but as it was we hopped out without any ill effects whatsoever - no whiplash, nothing.

But as mole says, the principal remains the same, it's just more extreme demands.

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PostPosted: Fri Oct 05, 2007 08:14 
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Mole wrote:
The other principal difference is the intrusion of having a steel roll cage in the car to bang your head on in the event of. This is the primary reason that helmets are worn in rally cars, and again why the occupants have to be so much more solidly restrained with fixed belts rather than "inertia reel" arrangements that allow more freedom of movement.

The net result of all this is that the such restraint systems are hugely more effective. My last rallying crash was head on into a dry stone wall at about 45mph. In a road car that would have been a big accident but as it was we hopped out without any ill effects whatsoever - no whiplash, nothing.

But as mole says, the principal remains the same, it's just more extreme demands.


hmmmm yup one of the main reasons we sometimes have to wear helmets when testing where i work is the fitment of a roll cage..... i recall a great top gear clip where clarkson smacks his head on the side window of a tvr he's twatting around (he had it coming).. the thought of doing that, or the same to a steel pole isn't tempting.

one thing 4/5 point harnesses have over regular belts, and one type of crash i'd imagine rallying is more prone to is rollover and that the harnesses stop you falling out of the seat.... which if i follow correctly is one of paul_1966's accident types where setbelts might be worse than non at all (after a long and unpredictable series of if..then statements!)


Last edited by ed_m on Fri Oct 05, 2007 10:08, edited 1 time in total.

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PostPosted: Fri Oct 05, 2007 09:09 
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ed_m wrote:
i recall a great top gear clip where clarkson smacks his head on the side window of a tvr he's twatting around (he had it coming)


possible thread diversion ... wasn't it the MG SV or has he done it more than once?

[edit] MG SV - 4.19 onwards http://www.youtube.com/watch?v=N98dvmNk ... ed&search=

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PostPosted: Fri Oct 05, 2007 10:04 
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Mole wrote:
semitone wrote:
In an aircraft the main use to to keep you in your seat if there is turbulance or violent manouvres.


If that's the case, they test them to one hell of a load! I'm pretty certain that although they will certianly do that AS WELL, they are primarily intended to restrain you in a crash. Obviously not maximum airspeed into the side of a mountian, but a more survivable sort of crash - like a ditching, crash landing or taxiing crash


I see your point but they try really hard to stop civil aircraft crashing because once they do the chances of being killed are very high. A simple lap belt holds you in the seat but it does little to stop your body hitting the things in front and will likely cause back injuries.

If the primary reason was to restrain you in a crash they would fit something better than a lap belt.


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PostPosted: Fri Oct 05, 2007 13:54 
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I think in aircraft, they rely on the back of the backrest ahead of you to do the bit that the diagonal belt on a car is supposed to do. It's true that air crashes aren't generally as survivable as car crashes and maybe the industry just took the view that the extra weight of providing an upper belt anchorage for each seat made the whole plane non-viable compared to the potential for saving lives so they just didn't bother. Coaches tend to do much the same thing - lap belt and then have impact resistance requirements for the back of the seat in front of you.


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PostPosted: Fri Oct 05, 2007 15:34 
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A plane is a woodworking tool :P


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PostPosted: Fri Oct 05, 2007 15:36 
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RobinXe wrote:
A plane is a woodworking tool :P


what is a chopper then :D?

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PostPosted: Fri Oct 05, 2007 15:59 
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Touche


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PostPosted: Fri Oct 05, 2007 22:24 
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Heres a good reason for wearing youre seatbelt.
Given the choice of a possible injury in the car vs this, take your pick Paul1966 and then tell me its still a good idea.
Warning *graphic* footage (not closeup but close enough).

http://www.youtube.com/watch?v=WZvY2mCZE2o


http://www.youtube.com/watch?v=i_S9qV8vLwI

http://www.youtube.com/watch?v=iX3DR5No3LM

http://www.youtube.com/watch?v=1wDbrj4eIEg

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PostPosted: Fri Oct 05, 2007 23:08 
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DeltaF wrote:

That's seriously bad viewing!


What also troubles me is how the driver of the first grey car didn't seem to react, the car just kept going :shock:


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PostPosted: Sat Oct 06, 2007 09:20 
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Mole wrote:
Their reason is that as most Public Service Vehicles carry standing passengers (who, by definition are not belted up!) they can't very well discriminate against them by providing belts for the seated passengers!

The European Commission looked at the case for banning the carriage of standees (and mandating belts on bus seats) but decided against it. Now I know you think that legislators only do this sort of thing to opress us, removing our freedom of choice etc, but actually, they looked at the number of lives likely to be saved and found that (unlike cars) so few people die in bus crashes that it wasn't worth it.


Ah, so we must legislate seat belts for car occupants because it's the state's duty to force people to do something for their own good, but the people who might get hurt while standing on a bus can go hang just because they are far fewer in number?

I notice that as yet not one single person has answered yes to my questions as to whether he would support a government-mandated diet, compulsory surgical procedures, etc. all backed up with fines for non-compliance. I assume, therefore, that there would be no support for such laws.

In this case, perhaps you could explain exactly why you think that the state should not force these things upon people for (a) their own good and/or (b) the benefit to society, but that it should force things like seat belts and helmets upon people.


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PostPosted: Sat Oct 06, 2007 10:16 
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Paul_1966 wrote:

Ah, so we must legislate seat belts for car occupants because it's the state's duty to force people to do something for their own good,


If its for genuine reasons then yes, but absolutely ONLY if its a genuine reason with no other complicating factors, like the politicians pushing for it because of a financial incentive...you understand im sure.

Paul_1966 wrote:
but the people who might get hurt while standing on a bus can go hang just because they are far fewer in number?



I agree.
Ive always held the belief that bus passengers should be belted in and no standing room and there shouldnt be any on trains either. Its illegal to travel standing up in a car for obvious reasons so why allow it anyplace else?



Paul_1966 wrote:
I notice that as yet not one single person has answered yes to my questions as to whether he would support a government-mandated diet, compulsory surgical procedures, etc. all backed up with fines for non-compliance.


Absolutely NO. The difference between a diet whereby you inflict harm on yourself over a long period of time vs that of an almost immediate ( possibly) death from not wearing a belt is why such laws wouldnt have any support, and rightly so.

Paul_1966 wrote:
I assume, therefore, that there would be no support for such laws.


Youre right.

Paul_1966 wrote:
In this case, perhaps you could explain exactly why you think that the state should not force these things upon people for (a) their own good and/or (b) the benefit to society, but that it should force things like seat belts and helmets upon people.


Eating yourself to death is one thing. Being flung through a screen or out the side into someone else thereby killing them is something entirely different, dont you think? That possibility has to be considered when deciding as to the law and its requirement.

I take it youve seen the footage of the guy on the highway getting a bit of a "bump on the noggin"? By an SUV........... :o theres your reason for wearing a belt. Also traumatising someone else and creating havoc ( look at all the panic responses) for others.
Your arguments making no sense, belts save lives more often than they take them. Thats good enough for me.

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