Quote:
Originally Posted by Racer x
The real difference is the tuck. If your back is flat then there is less void behind you.
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Yes and no, it's more complicated than that. The idea isn't to reduce "voids" as you call them, the idea is to control the flow over over the vehicle+rider body and reduce the about of separation.
Spend your evenings researching on scholar.google.com looking for research papers about CFD and/or wind tunnel tests on motorcycles. Check for sources like SAE or ASME or maybe even AIAA journals.
Look into other topics like trip wires or spoilers when you do your searching. Trip wires are a way to induce small turbulence in order to contain the flow better so it doesn't separate into large turbulent regions. The idea is it will follow the surface of your body longer. Skin friction << form friction, therefore taking a small hit on skin friction ddramatically reduces form friction.
most studies will have fancy pictures like this, not useful for much without knowing their scale/variables/whatever. But they look neat!!!
