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Posted by Johnny B Good on March 21, 2009, 3:04 am
 


 I used to run a Reliant 3 wheeler on a motorcycle driving licence until
I got the chance to take my car driving test courtesy of the firm I was
working for.

 The thing you have to appreciate is that you need to discover how to
handle it when cornering on two wheels as soon as you can take the
opportunity to do so in relatively safe circumstances of your own
choosing (just as you would with a conventional four wheel vehicle's
skid handling characteristics).

 The advantage of testing a vehicle's handling under extreme conditions
in circumstances of your own choosing is that you'll be better able to
avoid exceeding your vehicle's handling limits in everyday use and be
better able to take the best course of action in the event of a real
emergency situation.

 The problem is that most drivers have no idea what the limits of
handling are for the vehicle(s) they drive, nor how to best avoid or
recover from exceeding those limits and, consequently, the optimum
action to take when faced with an emergency situation.

 Admittedly, a modern four wheel car is a much safer proposition for an
unskilled driver with very little roadcraft than a three wheeled vehicle
but the owner/driver of any such three wheeled vehicle would be well
advised to gently explore the handling limits as soon as they can get
the opportunity to do so.

 A three wheeled vehicle can be as safe as any four wheeled vehicle,
provided the driver has the essential extra driving skills such vehicles
demand for their safe use. Motorcycle experience provides a considerable
contribution to the skills required in the handling of a three wheeled
vehicle.

--
Regards, John.

 Please remove the "ohggcyht" before replying.
The address has been munged to reject Spam-bots.


Posted by clare on March 21, 2009, 2:50 pm
 
On Sat, 21 Mar 2009 03:04:45 GMT, Johnny B Good


Very true of the "tricycle" 3 wheelers - but with the single rear
wheel version it is VERY difficult to get them up on 2 wheels.-
particularly if they are also front drive.

Posted by vaughn on March 20, 2009, 8:52 pm
 

You can't really talk about stability without mentioning what type of
stability you are talking about.  According to this SAE paper that compared
3 and 4 wheel conficurations, you get one answer for lateral stability, and
another, very different, answer for rollover stability.  Sorry, only the
absttact seems to be available on the web.
http://www.sae.org/technical/papers/820139

There are many dead and maimed farmers that learned the hard way about
three-wheel roll problems when their tractors rolled over...and they learned
it at dead slow speeds!


Yes, but this is independent of 3 or 4 wheel configuration.  Either of them
may be built high or low.  How many 3-wheeled race cars have we seen over
the years?

Vaughn



Posted by harry on March 20, 2009, 9:16 pm
 wrote:

web.http://www.sae.org/technical/papers/820139

The reason you don't see three wheeled race cars is because the centre
rear wheel is a pain in the bum to change.
There have been several homebuild sports cars in the UK  with the
three wheel configuration.  The rear (driven) wheel is invariably
massively wider than the front two wheels, leading to the problem of
spare wheels. Unless you have the undersized spare system thst is.

Posted by harry on March 20, 2009, 9:18 pm
 wrote:

web.http://www.sae.org/technical/papers/820139

The problem re. roll centres/suspension stiffness in a four wheeled
car is that the solution changes depending on the number of passengers
in the car. This is not so with a three wheeled car.

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