In article , Rick Cavallaro wrote:
On Sep 29, 4:25*pm, ThinAirDesigns said:

In this analysis, we show that
in a 27.5ftsec wind, and with the vehicle traveling ***directly
downwind*** over the ground at 55ft/sec, the retardant force on the
wheels needed to drive the propeller is less than the propeller needs
to keep the vehicle at that speed.

[cough]bull****[/cough]

So on the one hand we have someone who's actually built the thing and shown
that it works doing an analysis of it working, and on the other hand we have
a random usenet poster saying it's bull**** for no reason. Who to believe....