Keith W wrote:

"Bob Salvo" wrote in message
...

Anyone?
Bob

That's against the laws of thermodynamics. If you can make a passive device
produce thrust you should rule the world with your new perpetual motion
machine! At best it reduces losses.

In my country, our gliders move forward because the wing produces
thrust, and our sailboats move over the water because the sail produces
thrust. Whether we should rule the world is causing much controversy.

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Eric Greenwell
Washington State
USA