I’m trying to understand the effects of a bike’s trail on its steering stability. There, however, is a concept of slippage velocity of the tires during steering of which I cannot make heads or tails of.
Book- Motorcycle Dynamics
Author- Vittore Cossalter
Page no. 13-14
1st Question: Why should the final resultant velocity of the front tire be in the same initial direction of motion ? Shouldn’t it be in the plane or rotation of the front tire, now that a steering input has been given?
2nd Question: What is this slippage velocity ?
I’ve tried Google as well. But there isn’t any information on this topic in simple words.