> wrote in message
oups.com...
> Byron, glad you remember me. I haven't been doing much in the sim
> world lately. I'm hoping rfactor will change that I'm racing karts
> right now, which is the reason for my question...
>
> I'm building a new kart chassis. It's designed already, and I've
> welded the basic structure together. The idea of the design is to
> apply the idea of a rigid race car chassis to a racing kart. The
> center section of the kart is designed to be rigid. All the flexing in
> the chassis will be isolated to the front and rear tubing.
>
> So this is new gound I'm breaking here in terms of karting, but I
> figured there might be some car chassis design guidelines regarding
> chassis rigidity for varyious types of cars. And if there is, then
> someone on RAS would know. This information is probably in Milliken,
> but I don't have access to that book right now. I could add as much
> structure to the center section as necessary, but don't want to go
> overboard.
>
> As for measuring chassis rigidity, it's a common thing. The units
> would be force per unit of deflection - like lb/in or kg/mm, same as
> wheel rate. Rigidity is measured like you guessed, pin down three
> corners, apply a force to the fourth corner, and measure deflection. A
> car with a stiffer suspension would need a stiffer chassis to properly
> distribute roll torque.
>
> I know stiffer is better. But, stiffer is also heavier, more
> expensive, more time consuming, and more restricitive to the design.
> If I knew that street cars typically have a chassis rigidity of 1% of
> wheel rate, then I'd use that number as a target for my kart chassis.
> If the ratio is more like 1:1000, then I'm in trouble
>

So in the case of this kart of yours, this "centre section" is like the
chassis and the tubing is like suspension. Or is there seperate suspension?

How do you make adjustments? ie oversteer/understeer?

> BTW, what is FFS?
>

For frigs sake!