Thanks Geebee and Otto for info. It looks like if I use as much as I can from the shells of a HPV Cd will drop. It is more a question of how much can I change and still feel comfortable in full traffic, riding between cars in two lanes, which I find one of the big advantages of two wheel riding. Even with traffic jams I loose only some minutes. The back rest riding position is about 20 degree from vertical. This gives me a good feel in the high speed curves.
Maybe in a new design I can try a little more to gain some cross sectional area.
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