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#21
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George,
I have seen that arrangement before, it seems to have the ability to blend the properties of a helicopter and a wing, but there are enormous practical considerations to be overcome before it could fly. None are deal-killers, but the sum of them is quite a bit of development work to assure production capability. Mostly, concerns center on the 1) structural capability of the rotors, which have virtually no hinge (about 50% hinge offset) and 2) the ability to stop/stow and redeploy while airborne, with the tremendous stresses and dynamic changes inherent in that trick. The X-wing tried that (with a larger rotor) and was never successful, in the end. Certainly, the Diskrotor tries to win back some low disk loading, a very good first step! Nick "George Vranek" wrote in message ... Hello Mr. Lappos Would it be fair to toss a fourth rotor configuration in to the competition? www.diskrotor.com George "Dave Jackson" wrote in message news:IbHZe.556210$s54.151893@pd7tw2no... Nick, Would it be fair to toss a third rotor configuration in to the competition? How about the Side-by-Side Kamov KA-22 "Vintokryl: http://www.vstol.org/wheel/VSTOLWheel/KamovKa-22.htm ~ Speed of 192 knots [record] ~ Payload of 36,343 lbs [record] ~ Gross weight of 65,036 lbs This is a 44-year-old helicopter. Just think of what could be done with today's engines and composite materials. I think that it's a slam-dunk for the Vintokryl. Dave "Nick Lappos" wrote in message ... Just to keep the juices flowing, and get this newsgroup buzzing again, try this: http://webpages.charter.net/nlappos/...comparison.pdf |
#22
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Nick,
here are my answers on your concerns. "Nick Lappos" schrieb im Newsbeitrag ... George, I have seen that arrangement before, it seems to have the ability to blend the properties of a helicopter and a wing, but there are enormous practical considerations to be overcome before it could fly. None are deal-killers, but the sum of them is quite a bit of development work to assure production capability. Mostly, concerns center on the 1) structural capability of the rotors, which have virtually no hinge (about 50% hinge offset) .....but thanks to the GFRP technology, the helicopters with hingeless rotors are quite succesfull. and 2) the ability to stop/stow and redeploy while airborne, with the tremendous stresses and dynamic changes inherent in that trick.....the trick is in the sequency: first stow, than stop and first rotate, than redeploy. It is even possible to keep the disk in a slow rotation after stowing the rotorblades and use it as a small AWACS. The X-wing tried that (with a larger rotor) and was never successful, in the end.....but the X-wing equipped with the disk rotor could be the world first supersonic helicopter!!! Certainly, the Diskrotor tries to win back some low disk loading, a very good first step!....thanks for the flowers....and not only this! The disk brings law and order in to the aerodynamic of a helicopter rotor. Nick |
#23
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This will fix the entire problem.
http://www.vtol.org/issues.html#mono Of course, I don't think I'd like to ride in it, or under it, or whatever you do with it. Frank |
#24
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Hello Helowriter,
The machine on the www.vtol.org is a tiltrotor! Remember, the tiltrotors have not optimal rotors for howering and not optimal props for crusing. Therefore they are the wrong way to make a helicopter flying fast. The V-22, which is a result of 50 (five, zero) years of development, carries half as much, just so far, at twice the cost of an equivalent conventional helicopter and is only 50 % faster!!! The diskrotor helicopter shown at www.diskrotor.com equipped with two F-119 engines will take off, hower, autorotate and land as a convetional helicopter and cruise supersonic as the Concorde did!!! George "Helowriter" schrieb im Newsbeitrag ups.com... This will fix the entire problem. http://www.vtol.org/issues.html#mono Of course, I don't think I'd like to ride in it, or under it, or whatever you do with it. Frank |
#25
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George,
The only disagreement I have with your posts is the statement of futurity that pervades your thinking, as in "The diskrotor will...." Don't take this the wrong way, but nothing "will" until it "has" and not even a model of the diskrotor "has" flown. The technical hurdles in making a rotor that operates in a wide variety of speeds, rotational rates and maneuver states is a very challenging undertaking. When do you think you will fly something, even a part-scale model? Nick George Vranek wrote: Hello Helowriter, The machine on the www.vtol.org is a tiltrotor! Remember, the tiltrotors have not optimal rotors for howering and not optimal props for crusing. Therefore they are the wrong way to make a helicopter flying fast. The V-22, which is a result of 50 (five, zero) years of development, carries half as much, just so far, at twice the cost of an equivalent conventional helicopter and is only 50 % faster!!! The diskrotor helicopter shown at www.diskrotor.com equipped with two F-119 engines will take off, hower, autorotate and land as a convetional helicopter and cruise supersonic as the Concorde did!!! George "Helowriter" schrieb im Newsbeitrag ups.com... This will fix the entire problem. http://www.vtol.org/issues.html#mono Of course, I don't think I'd like to ride in it, or under it, or whatever you do with it. Frank |
#27
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Thanks for the response, George. I worked with Evan Fredenberg for
many years. There is no reason to send the documents. Good luck with your concept! Nick |
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