Try checking out Team Delft.
Human Power Team Delft & Amsterdam
Although they are working with streamlined bicycles, they have accumulated a fair amount of data about streamlining in the past few years which may apply to motorcycles as well. AFAIK each iteration has been tested in a wind tunnel. They are also the only other team to reach the 80 mph speed at Battle Mountain. Hopefully a lot of their info is public and available since they are a school.
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As Scott says, these HPVs look quite difficult to control.
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This is correct. The vehicles at Battle Mountain generally race in near no-wind conditions and still can crash due to stability issues. Some of that has to do with rider input but any more than a few mph wind can easily blow these vehicles across the road.
JJ