Jack, I was using a sprint car to show what caster effect was because it is
the most extreme example. It is easier for people to understand the idea of
what we are talking about by using such a simple car like a sprint car. I
never thought about running one for a land speed record.
Big Ditch Doug
LSR!
Put bicycle tires on a 700hp sprinter. and run it for a land speed
record.Then what?
Thanks Jack
----- Original Message -----
From: "Doug Odom" <dlodom@charter.net>
To: nt788@comcast.net
Cc: "land-speed" <land-speed@autox.team.net>
Sent: Friday, June 12, 2009 2:23:26 PM GMT -08:00 US/Canada Pacific
Subject: Re: [Land-speed] Car Spins
> Any steering input reacting to caster will load or unload one rear wheel.
> Caster causes spins. There I've said it!
>
> Jack
Jack, I agree that caster CAN cause a spin BUT it can also help you from
spinning.
Think about a sprint car. Short wheelbase and wide tread width with lots of
caster to keep it from following ruts in the dirt track. When the car cuts
left into the turn the driver turns the wheel to the right keeping the
front
wheels pointed the direction he wants to go. Now this jacks weight into the
left rear tire and off the right rear that is trying to rotate the car.
The longer the wheelbase and or narrower the tread width the less caster
weight jacking will occur.
Put a car on 4 wheel scales and turn the wheel from straight ahead to one
side and see how much it changes the rear wheel weights. Now crank as much
caster as you can into it and test it again. Or you can just believe me
because I have spent hours and hours doing this for roundy round set ups.
Big ditch Doug
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