3 ms·
You could probably build such a propeller to a boat as well, having the wind drive the underwater propulsion (only with worse efficiency than with rolling wheel
by yason 16y ago
You could probably build such a propeller to a boat as well, having the wind drive the underwater propulsion (only with worse efficiency than with rolling wheels, though).
You could build a similar device that travels upwind as well, albeit slower, right? The energy extracted from headwind by the propeller needs to be greater than the energy needed to keep the vehicle stationary against the headwind.
Using a Darrieus or Savonius turbine on the vehicle or boat would allow for more flexible headings without having to point the propeller to headwind direction.
- electromagnetic 16y agoThe turbines when pointed at the wind are actually not facing the wind. They're at an angle to the wind, which means you're making power from the turbine. As long as the power made exceeds the wind resistance and rolling friction of the vehicle. Also you might be interest in this: http://www.treehugger.com/files/2007/02/windmill_sailbo.php http://www.treehugger.com/files/2007/02/windmill_sailbo.php I was actually looking for a horizontal turbine boat I saw, but this came up before. However, the question with boats is whether it can beat the current as well.