Yes, a paddle boat is either a pump or a boat depending on how you wish to use the boat's paddles.
Are saying Leonardo's copter could lift itself in theory if it were light enough? That would be something to see. I always thought it was impossible in theory. Harry Michel Jullian wrote: > Of course, what would be the difference? Would a paddle boat pushing against > the quay (i.e. acting as a pump, pumping water backwards) work any differently > than when it's on the move? It's still paddles, or whatever, pushing a medium > backwards in order for the craft to go forwards if nothing prevents it (the > quay for the paddle boat, excessive weight in the case of the Leonardo copter) > > Michel > > ----- Original Message ----- > From: "Harry Veeder" <[EMAIL PROTECTED]> > To: <vortex-l@eskimo.com> > Sent: Wednesday, February 21, 2007 9:28 PM > Subject: Re: [Vo]: Lifters > > >> Michel Jullian wrote: >> >> >>> >>> Indeed. It would be like insisting that a helicopter doesn't work by pushing >>> itself against the air, it just doesn't make sense scientifically. But I >>> guess >>> it does make sense economically for the people who make a living on >>> promoting >>> the more mysterious hypotheses :) >>> >> >> >> The design in the attachment is suppose to fly by pushing the air. Well >> it will certainly push air but it won't fly. However, it can be made to work >> as a pump. >> >> But suppose it did fly...would knowing how it works as pump be sufficient >> to explain how it flies? >> >> >> Harry >> >> >
