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Old 06-11-2005 | 02:49 PM
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DanSavage
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From: Trabuco Canyon, CA
Default RE: Su-27 L.E. flaps

ORIGINAL: wsmalley
The mixer(s) are going to respond respond to the amount of stick you feed in, right? E.g., if you give full up elevator, you would get 'full down' LE flaps. On take-off, you would 'level' the elevator which in turn would 'level' the LE flaps. It seems you would want down LE flaps until you got to speed? I noticed there is something called an 'Omni' by Vee-Tail which is a programable mixer- they're apparently not shipping now though. I guess my point is I don't think you'd want the flap configuration constantly changing. I could, of course, be missing something!
Correct. Technically, they're the RC version of CL stunt flaps where the flaps operate in conjunction with the elevators. I had been thinking about something you wrote in an earlier post where the video of a full-size flanker showed the LE flaps deployed instead of operating like stunt flaps. So, I came up with yet another control setup seen in the pic below.

Instead of tying the LE flaps into the flap channel, you'd tie them into the aux channel of a 7-channel radio. This way you could deploy them seperately from the TE flaps, but still get the effect of stunt flaps when the LE flaps are retracted, ie down flaps with up elevator. As far as the flap position constantly changing, I don't really see that being a problem as long as the amount of flap and elevator are more or less aerodynamically balanced. CL stunters have been doing this for years to increase manueverability. I'm thinking of building a system like this for my Platypus.

Dan