Deploying flaps and torq? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-23-2005, 11:34 PM   #1
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Deploying flaps and torq?

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I finally finished the repairs to my Beaver, well almost. I went out to fly it tonight and I noticed that when I deployed the flaps to full deflection I also got a little left bank in the wing. Just a little, nothing like a tip stall. I figured I was not getting the same deflection from both flaps so I checked it when I got home with a deflection gauge and they are within less than a 1/16" of each other. So then I started to think maybe it was torq or prop wash being disturbed by the flaps. Any thoughts?
Ted LeBlanc
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Old 08-23-2005, 11:45 PM   #2
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Beaver Damn

I think the next thing I would do is put a light mylar seal over the lower aileron gaps and try it again.
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Old 08-24-2005, 08:35 AM   #3
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If it is propwash, the rolling effect will disappear when you throttle back to idle.
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Old 08-24-2005, 08:50 AM   #4
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Have you looked at the flap rigging when stowed? The L/H may be rigged a little deployed giving a roll to the right which is compensated when you trim the model, left wing down trim. Once the flaps are deployed and equally rigged the slight left trim gives you a roll to left.

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Old 08-24-2005, 08:56 AM   #5
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If you have a computer radio capable of it, mix a little right aileron with flaps.
Ron Mattiuz

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Old 08-24-2005, 09:19 AM   #6
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All good suggestions.

Many other causes could be the culprit;
- slight difference in control surface size
- slight warp
- linkage slop
etc. etc.

It could even be something as obscure as an issue with your tailfeathers that is aggravated by the "dirty air" coming off the flaps.

The easy fix (now that you have the 9303) is already suggested; slave a mix to your flaps. The down side of this solution is it will be airspeed dependant. You could add a second mix slaved to throttle to reduce this effect but it would still only be a little closer as throttle is not the factor affecting airspeed.
MAAC# 12719
Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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