wrote)
The coefficient of drag for motorcycles is usually pretty bad unless they
are faired, and it still ain't great.
The power required to overcome drag is 1/2(p*v^3*A*C)

p is the densitity of the fluid
v is the airspeed
A is the area
C is the coefficient of drag


80-ft length of the semi
(vs.)
8-ft length of the motorcycle

Does this play (much) of a role here?

Is that role expressed (adequately/sufficiently) in the above formula,
through "C" ...drag?


Paul-Mont
http://www.totalmotorcycle.com/motorcyclespecshandbook/1MotorcycleManufacturer.htm
Fun site - make / model / year. My Yamahoppers were both in there.