Re: [Electric Boats] Station keeping Azipod -- was Re: Multidirectional Docking Electric Motors

 

Well sometimes anchoring isn't an option, expecially when you want to MOVE.   Consider a wagon, with a windmill geared to the wheels.  If the gearing is low enough, the windmill will turn the wheels and push the wagon along, even upwind.  The difference is that wagon wheels normally don't SLIP.  To convert this contraption to a boat you're going to need a BIG prop with really low pitch to get absolute minimal slip.  And getting the correct gearing between the turbine and the prop would be a challenge.  But it HAS been done: http://www.youtube.com/watch?v=oKqC5JsurOk&feature=related http://www.youtube.com/watch?v=NNbNNSDljGI&feature=related http://www.youtube.com/watch?v=IzGCYaJbf0A&feature=related A side benefit would be that as the vessel began to move into the wind, the apparent wind velocity would increase, providing more power, and hence more speed.  So the faster you go, the faster you go, until hull drag or wind resistance overcomes the increase. Just how practical it would be is another discussion altogether.  I can just imagine the boat in a seaway with all that weight aloft... --- On Thu, 11/11/10, danbollinger <no_reply@yahoogroups.com> wrote: From: danbollinger <no_reply@yahoogroups.com> Subject: [Electric Boats] Station keeping Azipod -- was Re: Multidirectional Docking Electric Motors To: electricboats@yahoogroups.com Date: Thursday, November 11, 2010, 10:56 AM   I agree with Willie. Your best bet is anchoring! Seems to me that using wind power to generate energy, to resist that very same wind energy, along with inevitable losses, is impossible. Sorta like trying to make a perpetual motion machine. --- In electricboats@yahoogroups.com, Steamboat Willie <stmbtwle@...> wrote: > > To be honest I think it could be made to work, but you're going to need a REALLY BIG prop to be able to develop the thrust required to push you up wind against the turbine drag.  After all, consider a sail as a big "turbine blade" and the centerboard/keel as a big "propeller blade".  In THEORY it'll work.  In practice, I dunno.  > > Willie >

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