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Old November 5th 08, 07:07 PM posted to sci.energy,rec.aviation.homebuilt,rec.aviation.military,rec.aviation.marketplace,sci.engr.mech
alexy
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Posts: 53
Default Dimples On Model Aircraft Could Greatly Extend Range

wrote:

A bicycle wheel spins much faster than 20-25 knots apparent to the air it
interfaces with. At 30 knots, for example, the surface of the wheel might be
moving closer to 100 knots apparent to the wind.


It's just double the speed of the hub.


Maybe he was riding into a 40 knot headwind? g
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