User talk:Tulipacerebri

Trail braking

paragraph in question:

Traditionally, trail braking is done exclusively with the front brake even though trailing the rear brake will effectively slow the motorcycle, also decreasing the turning radius. If the motorcycle is leaned over, forces from the front brake and the deceleration causes the motorcycle to yaw (lean), while use of the rear brake generates a torque that tends to align (straighten) and stabilize the motorcycle.[7][clarification needed]

1.I can't see where this is covered in the reference [7] Cossalter Motorcycle Dynamics 2.Terms lean and yaw are different.

Bike lean involves a rotation about the roll axis (front to rear), with a roll centre being below the ground for a given bike,rider,rate of turn and turn radius. Yaw is a twist or rotation as seen in a plan view. [TF p.3-22]

When leaned over the contact patch moves from the mid point to the inside of the tyre profile. Applying the brakes creates a torque force turning the wheel more into the turn, which will tend to reduce lean angle i.e. upright the bike. e.g. in a left steady state turn with lean, applying the brakes will torque the steering anti-clockwise ...which increases the centripetal force for that rate of turn thus tipping the bike outwards...i.e. straightening it up. [TF P14-10]. At the rear wheel braking creates a torque that yaws the frame into the turn applying a lateral force on the steering axis which also turns the wheel into the turn. [TF P14-10].

TF: Tony Foale Motorcycle Handling and Chassis Design - The Art and Science 2002

Rear brake application will alter squat position and typically should tend to straighten the swing arm angle slightly increasing wheelbase and rear wheel trail and front wheel trail.. . Some frame designs aim to minimise squat so reducing this effect.