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Mini-HowTo
aileron-flap differential on full house sailplane
I'm getting into my 1st full house sailplane (Eraser Extreme 3.2m) & have some questions about settings. Most of what I read about settings are in relation to TD flying, hi-starts, etc. (so launch mode,zoom,...) but I will just be flying slope. When I'm in "regular flight" mode, R aileron up 100%, R flap 50%, L flap -50%, L aileron -25%.
My questions: 1. should the leading edges of the L aileron & L flap be the same, ie form one long leading edge? or should the L aileron have less differential than the L flap. 2. since I am not using a hi-start,...should my launch mode simply be a slightly cambered wing(s) 3. for landing, w/ crow-butterfly deployed, should there be any differential on the ailerons (so if I am turning R to straighten the wings, L aileron should remain at neutral, or should it deflect some in the opposite direction? thanks all! |
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you want the flaps to follow the ailerons, but about 40% of the movement - that's dead simple on my old JR Tx so in your scheme: R aileron up 100%, R flap 40%, L flap -40%, L aileron -100%. however, you will also be using differential - more up than down - so if you were using 50% differential (and that's quite a lot) - that would be more like: R aileron up 100%, R flap 40%, L flap -20%, L aileron -50%. Hope that helps? launch camber - only relevant for max height gain for F3F - for general flying launching, don't bother - just chuck it off... for landing approach with CROW - I still have the differential - cant be bothered programming it out - BUT - I also use rudder to give more control under CROW - and I know some other folks do too. Phil. |
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Last edited by Phil.Taylor; Mar 27, 2013 at 03:24 PM.
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Thread OP
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great info!
thanks Phil,
that's exactly what I needed to know, thanks for the "rudder" tip during landing...I won't be using 50% necessarily for the differential, rather, wanted to use easy round numbers to illustrate ratios... I won't bother w/ camber as I chucking it...i'll do just that, throw it out... christian |
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happy to help!
for aileron differential - I generally use a ratio of "3 up" vs "2 down" (measured at the control surface) - I found that 50% (2 up vs 1 down) killed the roll rate too much Phil. |
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-and when in crow mode, you want the flaps to act only as down flaps, no longer mixed to the ailerons if you follow, or it will get very funky.
-Flaps to ailerons in flight mode are mixed at about 1/3rd, works for me and others. -Remember to add some ailerons up a touch when flaps go down in crow to create some washout, saves the wing tips stalling so easily |
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Interesting discussion...
I have only setup one four-servo wing glider... also a TD style glider. I flew it only on the slope, with the main goal of doing big air acrobatics. I had some differential in the Ailerons... similar to what Phil recommends... maybe a bit less. I tried to get just enough differential to eliminate the adverse yaw thing. I tend to use my Rudder in the turns so adverse yaw was not a big deal. As Phil mentions too much Aileron differential make precise rolling very difficult. I also tended to fly my wing with no "set" camber (in aerobatic mode) and used a "snap flap" mix to pull/push camber/reflex for banked turns and loops... equal camber/reflex in flaps and ailerons. I suppose the more neutral (less camber) your wing, the less differential you need on the ailerons. My Flaps followed the Ailerons, with lesser throws; and no differential. My main goal with the flaps was to have some roll ability; small camber/reflex throws; and maximum flap deflection for landing... 70° or more if I could get it. I never got the chance to play with "crow" too much. The full deflection flaps slowed the glider down pretty well. I agree with Phil that a good full Rudder throw is very helpful when landing. Dawson |
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Check out Kevin Newton's page on setting up F3F ships: http://kevin-newton.blogspot.com/200...ng-glider.html
I've used this as a guide for years. I program negative differential in for landing when I am using crow, so that you have more roll control when the ailerons are up. Tuning is fun! Andy |
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