Looking at your first picture, you might be able to get lower drag from your tuck by slightly standing up on the pegs, lifting your rear so that it is less angled. Take another picture like this and confirm that your frontal area is not increased.
Also, hard to see from your first picture, but does your front fender have deflectors on the sides of the forks? Moto GP bikes have those, and I would assume they contribute to lower drag.
Quote:
Originally Posted by jakehammer2000
how did you determine the appropriate taper rate? Was expected top speed a factor in that math?
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I have hucho's book on aerodynamics, and I read in it that the longer the shape is, the greater the taper rate could be. Shorter vehicles have best drag at a taper rate of 13 degrees, while longer vehicles can get away with 22 degrees. Motorcycles are definitely the short kind.