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#21
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At 20:12 21 October 2004, Denis wrote:
COLIN LAMB a écrit : If a wing is replaced by a rotating cylinder, with the forward surface rotating upward, lift will be produced. The local air velocity is high on top and low on the bottom. This upward force is known as magnus effect. The information above comes from my helicopter handbook. The theory is used to explain some helicopter principles, but caused me to wonder more about it. Has anyone every produced an airplane using the magnus effect? If the cylinder is rotating faster, I would expect that lift would be increased. Does anyone know if there have been any writings and/or test aircraft? Not much use with a glider, for obvious reasons - but the answer would make me a bit smarter. I was not able to find much on the internet. No sailplanes, but a sailboat did navigate using rotary masts. The boat sailed around a triangular course in a completely upright position - no heeling. It was designed by Flettner -- the same one who gave us the Flettner (anti-servo) Tab. |
#22
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"COLIN LAMB" wrote in message ink.net...
If a wing is replaced by a rotating cylinder, with the forward surface rotating upward, lift will be produced. The local air velocity is high on top and low on the bottom. This upward force is known as magnus effect. The information above comes from my helicopter handbook. The theory is used to explain some helicopter principles, but caused me to wonder more about it. Has anyone every produced an airplane using the magnus effect? If the cylinder is rotating faster, I would expect that lift would be increased. Does anyone know if there have been any writings and/or test aircraft? Not much use with a glider, for obvious reasons - but the answer would make me a bit smarter. I was not able to find much on the internet. Thanks, Colin N12HS Colin, I have to find an old book of mine. It has a picture of a boat that was steam powered but featured no side-wheels, propellers ot masts. Instead it had two large vertical cylinders which were spun at different speed or even in opposite directions. The force vectors created by these cylinders and the fact that there were two of them made the boat very manouverable; it would even go sideways. Sounds like what you are describing , just turned by 90°. Uli Neumann |
#23
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"Joe D." wrote:
About 20 yrs ago, something similar was marketed as a flying tube. It was essentially a 1/2 height aluminum soda can, open on both ends. The lip on one end was slightly weighted. You threw it like a football, overhand with a side spin. The tube's open axis was the flight path. It flew very well, would go 200 feet. It was amazing to see such a low mass object cut through the air so far. Don't remember the name. -- Joe D. There are similar things available now. But those fly along the axis of the cylinder. The tube I am flying flies (sort of) perpendicular to the axis of the cylinder. Steve L. |
#24
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Denis writes:
No sailplanes, but a sailboat did navigate using rotary masts. Calypso. A similar effect is used on an helicopter instead of tail rotor (the tail is not rotating but side lift is created from main rotor flow by blowing air through on side or another ) Called a Notar I think. -- Paul Repacholi 1 Crescent Rd., +61 (08) 9257-1001 Kalamunda. West Australia 6076 comp.os.vms,- The Older, Grumpier Slashdot Raw, Cooked or Well-done, it's all half baked. EPIC, The Architecture of the future, always has been, always will be. |
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