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The nose section has to be strong in compression both because of pressure and for crush space in a collision. One can make a set of aero bars from a pair of bar end grips, some aluminum angle stock, and tubing that fits on a flat handlebar. The speed limit for most roads commuters use is 25-30 mph. Back angle will depend on riding style and traffic conditions. A low drag shell is needed to get energy consumption down to 0.1-0.2 hp. The ground clearance of the shell would be much higher so that a rider can put a foot down at a stop. The simplest set up is a parabolic nose and a conic tail piece ala Oscar Egg's Rocket.
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