b) NO, I mean that the rear tyres leave the 'assumed' fully gripping position of being INSIDE the cornering trajectory of the front tyres(as occurs with a road car being driven at SENSIBLE speeds) to the point where BOTH rear tyres are now (probably) equally placed either side of the central trajectory. I.e., BOTH rear tyres are 'sliding' sideways.
c) It depends what YOU mean by oversteer. If you mean 'both rear tyres lose some sideways grip' then YOU are correct. However, having the steering at or less than the angle of the trajectory would NOT imply OVERsteer to me..... merely 'steer' if such a term can be used here.
For me, oversteer is EXACTLY what it says..... when you need to apply NEGATIVE lock (i.e. the vehicle has 'steered' PAST the optimum and now requires corrective action) to maintain the kart's trajectory i.e., that the rear wheels of the kart has moved SO far OUTSIDE the average trajectory that the driver needs to apply NEGATIVE lock just to hold it. As I tried to say before, as an example of this, see any of those mindless 'drift racers'. The rear of their car is SO far 'out' that the driver maintains opposite lock for the whole corner.
So, for me:- a) Understeer is when you have to apply MORE lock than would follow the trajectory of a non-sliding vehicle b) Oversteer, is when you have to apply OPPOSITE lock to maintain the trajectory c) what karts do is to apply ZERO lock mid corner (as an optimum) and I would coin the term 'steer' (half way between over and under steer) for this 'state' and call it 'steer' to impart the meaning that it is NEITHER OVERsteer nor UNDERsteer but is that 'Goldilocks' position of being 'just right'.
I am not sure I understand the term 'slip angle' enough to use it here. Does it refer to the angle a tyre presents to the 'trajectory' or does it refer to the angle at which the CHASSIS references the trajectory? The former meaning would give at least THREE 'slip-angles' in a kart in any corner and thus I can't see how we can discuss the matter simply if THAT is the meaning.
Ian
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