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Old Jul 07, 2001, 12:03 AM
stevenfrancis2000 is offline
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Forward Swept Flying Wing


Is it possible to make one with a larger sweep than just a few degrees? I searched the web and the examples were just a tad swept forward. Also, a question on washout and reflex. With the tips being infront of the cg, would the washout still be down, or should the washout be moved to the center? Would reflex be curved down instead of up?
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Old Jul 07, 2001, 12:35 AM
Jim Petro is offline
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The Dream Catcher Hobby company makes quite a few nice gliders including the Toucan. It has a very futuristic fiberglas fuselage ending with a shark fin. The wings are thin and well swept forward. It does not incorporate any wingtip twists because it is aerobatic. There is minimal reflex when balanced and trimed for max performance. The original design was first published in Model Aviation several years ago.
Old Jul 07, 2001, 08:30 AM
cwatters is offline
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Quote:
Originally posted by stevenfrancis2000:
Is it possible to make one with a larger sweep than just a few degrees? I searched the web and the examples were just a tad swept forward. Also, a question on washout and reflex. With the tips being infront of the cg, would the washout still be down, or should the washout be moved to the center? Would reflex be curved down instead of up?
You would need wash-in OR normal reflex OR some combination of both. My recommendation would be not to build this unless you really can afford to experiment a lot...

For example slightly too much wash-in and your model will be prone to tip stalling. Too little and it might be unstable in pitch (I assume you are talking about a tail less model).

If I really had to build one I would probably start with a section designed for an unswept flying wing (eg +ve pitching moment) and use no wash out and mimimal forward sweep.



Old Jul 07, 2001, 12:16 PM
motorhead is offline
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The problem is getting the weight foreward. This is why the Toucan has a fuse. I have a wing with a strait leading edge and had to add a fuse to get the CG right.
Mike
Old Jul 07, 2001, 12:32 PM
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One problem is where to put the control surfaces. If you were to add winglets they would pull the wing around so that it would fly swept forward. Ailerons will have similar problems.
To get a correct CG, you'll need a lot of weight in the wingtips. Putting 2 batteries out there would be a problem, so you'd need a lot of ballast.
I think the only practical way is with a fuse and tractor motor. But then its not a flying wing.
Old Jul 07, 2001, 07:20 PM
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Don't forget that a swept forward wing has to be exceptionally stiff torsionally, with or without fuse.
Old Jul 08, 2001, 11:14 PM
U2Steve is offline
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Now with more COWBELL!
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I was reading this thread, and went to the Dream Catcher site to check out the Toucan. I think I'm in love! Jim Petro, did you ever build one? And do you think it would take electric power?


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