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This thread is privately moderated by phil alvirez, who may elect to delete unwanted replies. |
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hybrid sailplanes:why?
the idea started when i was considering getting a fuselage of a sailplane similar to the ask 21 that i like very much, and design a wing/tail for thermaling, even if this means not looking scale-like. i just like the shape of modern sailplanes fuselages. so this means engineering the whole thing to match the fuselage, and it is not an easy task. after shopping for a suitable fuselage, i ended up buying first a 2 mt ask 21 from hobby king, and later an asw 28 from same source. then i decided to give them a try as they are, before discarding the wings and tayloring new sets for thermaling, with larger area and higher lift airfoils. the result was that both planes crashed several times due to strong tendency to tip stall. i tried improving them by adding dihedral to the '28, and then enlarging their wing area, but even if showed some improvement, still they were not pleasurable to fly, to say it mildly.
i have been able to work on the '28 wing. the new wing, that has more area, also uses a naca 6409 high lift airfoil that i have used extensively through the years, and polyhedral, and the results were a great improvement, and no more tip stall tendency. with this i even managed to get rid of the ailerons, so now i am able to do all that i need with only rudder and elevator. see my blog. i will add more as i finish-and fly test-them. |
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Last edited by phil alvirez; Apr 08, 2013 at 12:43 AM.
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