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There are useful posts in Aerodynamics and Motorcycle/Scooter sections. The body's widest part is at the shoulders, about 20 inches. Handlebar width is normally 23 inches. Any thing to deflect air around the chest and lowering your shoulder height helps but the biggest gain is from smoothing the air behind the rider as per the Rocket by Oscar Egg. At recumbents.com in Technical/bike building there is a thread on software for designing shells.
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