The best cure for sidewind after making sure the CG is ahead of center of pressure is downforce, especially on the front wheel. The bottom profile should be more curved than the top and the cross section should be an elipse. The angle of attack of the whole body would be nose down. With a recumbent the rider's weight is more to the rear than an upright so a longer tail is needed. See the Aptera shape developed by Dr. Alberto Morelli. The engine should be as far forward as possible ala the Gurney Alligator and a long parallel link swing arm for the rear suspension.
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