Quote:
Originally Posted by swamp2
I would expect a similar trend across a very wide range of bikes, but if you narrowed your list to ultra high performance bikes I believe the trend and R^2 values would not be nearly as good. Too many tire, chassis, state of tune variables when the bikes themselves are very close.
Drag would be an interesting effect especially on a high speed track. However, I'd be willing to bet that the slope and R^2 for a drag regression do not show as strong of an effect. This will be in part to drag not varying as much as power to weight ratio. Sporty cars are simply all pretty darn similar in regards to fronal area as well as Cd.
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My only real point with the cycles was to point out the effect of drag at high speeds. In my own experience, on a 600cc cycle I could out ccelerate almost any car on the road by a large margin up (1/4ths in the low 11's) to about 125mph...after that ultra high performance cars started catching up or even passed me if given long enough as the cycle would top out around 155. Thus, though I raced a 600, for the street I ran 1000's that were good for 186.
I am theorizing that some of the outliers may be partially explained by drag, and that by adding drag to the existing model it might become even more predictive. And by adding drag I bet the model might even account for both "Super-performance" cars and Superbikes without the need for a dummy variable.