rec.autos.simulators

> I need to use keyboard steering and I've basically got the left &
> right keys increasing the steering angle to about 30 degrees. If the
> user has no keys pressed then the steering travels back to 0 degrees.

> If I use Beckmans magic formula (Phors Part 29...),

>  Flateral = weight * 31 * SlipAngle * (1 + POW(ABS(9.625 *
> SlipAngle),2.375))

>  then the front-wheels slip angle is only momentarily at its peak, it
> then passes through the max-force slip angle & tapers off, leaving the
> car with extreme understeer.

> If I however limit the max steering angle to  +/- 8 degrees it steers
> ok, but once the car starts to slide there isn't enough steering angle
> to control the oversteer & it's useless.

>  It appears to me that one can't use keyboard control with slip
> formulae that taper off after the peak, if I use a simple flat
> limiting it works ok.
> (Well sort of works, it still won't slide out with full steering lock
> while accelerating from 0.)

> - If you HAVE to implement keyboard control (i.e. if u are working for
> a commercial product)... try to implement some sort of "magic steer"
> that will turn the wheel just enough to be on the slip angle peak
> value.

> - If you are working to a "sim for fun" (like I'm doing), just forget
> about the keyboard! There's no point in implementing real physic and
> then "destroy it" with key control?.. would it be possible to drive a
> real car with the keys???

> Stefano Casillo

> - If you HAVE to implement keyboard control (i.e. if u are working for
> a commercial product)... try to implement some sort of "magic steer"
> that will turn the wheel just enough to be on the slip angle peak
> value.

> - If you are working to a "sim for fun" (like I'm doing), just forget
> about the keyboard! There's no point in implementing real physic and
> then "destroy it" with key control?.. would it be possible to drive a
> real car with the keys???

> > - If you HAVE to implement keyboard control (i.e. if u are working for
> > a commercial product)... try to implement some sort of "magic steer"
> > that will turn the wheel just enough to be on the slip angle peak
> > value.

> > - If you are working to a "sim for fun" (like I'm doing), just forget
> > about the keyboard! There's no point in implementing real physic and
> > then "destroy it" with key control?.. would it be possible to drive a
> > real car with the keys???

> It seems to me that if the racing line is known then you can quickly
> figure out if the user is steering too much or too little, and adjust
> the steering automatically.

> I am assuming that this is what N2002 does when using the keyboard,
> works quite nicely ....

> Colin

> > - If you HAVE to implement keyboard control (i.e. if u are working for
> > a commercial product)... try to implement some sort of "magic steer"
> > that will turn the wheel just enough to be on the slip angle peak
> > value.

> > - If you are working to a "sim for fun" (like I'm doing), just forget
> > about the keyboard! There's no point in implementing real physic and
> > then "destroy it" with key control?.. would it be possible to drive a
> > real car with the keys???

> It seems to me that if the racing line is known then you can quickly
> figure out if the user is steering too much or too little, and adjust
> the steering automatically.

> I am assuming that this is what N2002 does when using the keyboard,
> works quite nicely ....

> Colin

> > - If you HAVE to implement keyboard control (i.e. if u are working for
> > a commercial product)... try to implement some sort of "magic steer"
> > that will turn the wheel just enough to be on the slip angle peak
> > value.

> > - If you are working to a "sim for fun" (like I'm doing), just forget
> > about the keyboard! There's no point in implementing real physic and
> > then "destroy it" with key control?.. would it be possible to drive a
> > real car with the keys???

> > Stefano Casillo

> Yeah, it is mainly for fun (some way to have fun eh...) and I was
> thinking along the same lines as you. There's no way to make a serious
> sim with keyboard control.. I might just finish off my fun driving
> game then move to a more serious "SIM" later on.

> Another question, re Slip, I got to thinking last night, assuming no
> weight transfer in lat or long direction & no long slip, if the car
> was going fast, & one slowly started to turn the steering wheel in one
> direction, if you turned it very slowly (and didn't hit anything),
> wouldn't the rear/front slip angles be nearly the same, & if this was
> the case, due to the front wheels steering, & therefor have a
> fractionally higher slip angle (just a bit), wouldn't the front end
> always lose it's grip before the rear end & therefor always
> understeer??
> (Sentence too long.. breath ;)

> I thought I understood this "SLIP" thing but other people in RAS are
> saying the car should eventually spin out???