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08-31-2008, 10:04 PM | #1 |
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Bipe aileron linkage geometry!?!
Was reading a thread on RCU discussing bipe aileron linkage geometry. Bipe in question is a WM Ulti 40s, but I'm wondering about biplane aileron setups in general.......
Is the stock geometry going to induce any unwanted aileron differential between same-side (upper and lower) ailerons? Or should the suggested control horn mod be included into the build? Here's some photos to show what I'm talking about..... Can anyone elaborate on this theory, or is it flawed.... Is it even enough to worry about, or just build it stock and forget about it? Thanks in advance guys. Last edited by BigBreeze; 08-31-2008 at 10:07 PM. Reason: spelling!! |
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08-31-2008, 10:12 PM | #2 |
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Re: Bipe aileron linkage geometry!?!
This looks to me to be the most desirable setup.....
Last edited by BigBreeze; 08-31-2008 at 10:15 PM. |
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09-01-2008, 09:23 AM | #3 |
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Re: Bipe aileron linkage geometry!?!
Don't worry about it.
If youwant to get complicated, why not do it like the Pitts and Christen eagle. They have an attachemtn which protrudes in front of the aileron leading edge. There is then a slot in the wing, again ahead of the aileron, to allow the attachment and connecting rod to pass. The first method you show is used on my GP Giant AEromaster. No problems there. I used that method on an ACE 4-120 bipe for years with no problems. The second method you show is used on the SIg Hog Bipe. However, the horns are on the lower surfaces of the ailerons. The third method could mean a weak linkage since there i snot much area where the horn is. You'd most likely need to attach it inside the aileron, perhaps to the face of an aileron rib and of about equal size, to achieve the required strength so that it does not pull out. If you really get industrious, you could set up your ailerons with horns for all three methods and the simply connect them in the suggested ways and compare how the plane behaves. Then you'll know for certain and all the speculation will be worth squat. |
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09-01-2008, 09:53 AM | #4 |
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Re: Bipe aileron linkage geometry!?!
I use the method shown by Bigbreeze. Ply fitting bridges over and under the rear trailing like a wedge cut out of the ply. No need to weaken the trailing edge. Pushrod is Carbon fibre so it's fairly light.
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09-01-2008, 10:02 PM | #5 |
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Re: Bipe aileron linkage geometry!?!
I guess I could just "fly it and forget it", but I'm wondering how many negative aerodynamic forces come into play with potentially FOUR wings all going different amounts of deflection!!! (ie, imagine aileron differential programmed into transmitter, plus top and bottom now deflecting different amounts, if you know what I mean!?!) Lift and drag would be different on each wing, this plane could get hairy!
Anyways, that could introduce potential snapping tendencies at very inopportune times!! I guess i would like to make this little bipe as true as possible from the start without having to fight with all the adverse tendencies throughout the flight, if there will be any. |
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09-01-2008, 10:16 PM | #6 |
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Re: Bipe aileron linkage geometry!?!
Forgot you had a diagram at the first. The last diagram is the most accurate, aerodynamically. As DO 335 says, they'll all work.
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