Anyone prepared to show me the maths for this? I guess we need to know 1) the drag of the prop, 2) the capactiy of the prop to gather energy and 3) the amount of energy required to drive forwards against the drag.
Ok, thanks for all replies.
Everyone agrees that the energy gathered by the Windmill is enough to drive the windmill forward directly against the drag of the wind that is powering it.
Anyone prepared to show me the maths to prove this? I guess we need to know 1) the drag of the prop, 2)...
Can you make a wind turbine powered boat or cart that travels forwards directly into a headwind without storing energy at any time?
Like this:
http://www.treehugger.com/files/2007/02/windmill_sailbo.php
It seems to me that it's a bit like making a cart that's geared in such a way as to...