Quote:
Originally Posted by PeterS
Hmmm, this is a bit difficult and I'm glad to be educated . My understanding is that a standard sit up and beg motorcycle is around .9. That works out perfectly with the calculator and a 1955 13hp Royal Enfield on test. It was using it's maximum hp and it's power and fuel consumption were very accurately recorded.
Can you link me to some site giving the cd of various bikes ? Perhaps some allowance for the rider sticking up on top? The rider must get the .9 cd surely ?
What do you think Craig's model would rate ? .35 ?
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The Cd 0.9 value is from Sighard Hoerner's 1951 book,Aerodynamic Drag.It includes bike and rider.It is based upon an average 6 sq-ft frontal projected area.