[ODE] Slip angle for a car

[Gerhard Wesp]

On Wed, Feb 25, 2004 at 12:24:59PM -0000, Stephen Smyth wrote:
> 
> cos(alpha) = x*Vx + y*vy + z*Vz 
> 
> Is this completely wrong? 

Almost right :-)  You need to normalize the vectors, i.e. 

  cos(alpha) = 
    x*Vx + y*vy + z*Vz / sqrt( (x^2 + y^2 + z^2)(Vx^2 + Vy^2 + Vz^2) )

Regards,
-Gerhard
-- 
Gerhard Wesp             o o           Tel.: +41 (0) 43 5347636
Bachtobelstrasse 56       |       http://www.cosy.sbg.ac.at/~gwesp/
CH-8045 Zuerich          \_/