hi grand,
i have to react on one thing of your post;
the sittingposition i have on my first proto recumbent motorbike may be totally different from the scooter it has been, the weight destribution is even. in my case there is no more pressure on rear or front wheel then with the original sittingposition. i have checked it.
the longer tail may be better with sideways pressure, it will do seriously negative in drag. when you minimize the surface of the rear and loose the air earlier the drag will be reduced a lot. that's why this VW 1L car or a speedboat's tail is this short.
abel
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