Optimal rpm for fuel economy???

[Orin Eman]

> 
> On Thu, 20 Sep 2001, Browning David wrote:
> 
> > I think another very important factor is wind resistance.
> 
> Speed squared, yes.

The wind resistance is indeed proportional to 'air speed' squared.
The power to overcome this is proportional to wind resistance multiplied
by ground speed.  With no wind, this means the power required is
proportional to speed cubed.

FWIW,
Orin.