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plane turns left with full flaps

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Old 06-25-2014, 11:44 AM
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raptureboy
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Default plane turns left with full flaps

I have a Top Flite 60 size mustang, and when I drop the flaps to full it makes a diving left turn. even at 25% flap it turns slightly to the left. I have the flaps on seperate channels so they can be adjusted independently and have the control horns set in the same position. They appear to be in the same position when down or up. What could be the problem and possible solution?
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Old 06-25-2014, 11:48 AM
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If what you believed to be true was false would you want to know the "REAL" truth?

"You shall know the truth, and the truth will set you free" AMEN
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Old 06-25-2014, 12:09 PM
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Perhaps under load the left flap extends down more then the right? Are the servos in the wing with direct pushrods? Did you activate a mix unknowingly?
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Old 06-25-2014, 12:37 PM
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First I would ask, how fast or slow is the plane traveling when the flaps are deployed and you notice the left wing drop?
It the plane is not stalling forcing the drop then I would check with a deflection gauge and make sure each flap is extending to the same position/degree. It's possible that one flap is extending further than the other, or a servo is bad and not holding down the flap when it's under pressure.

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Old 06-25-2014, 04:33 PM
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Originally Posted by raptureboy View Post
I have a Top Flite 60 size mustang, and when I drop the flaps to full it makes a diving left turn. even at 25% flap it turns slightly to the left. I have the flaps on seperate channels so they can be adjusted independently and have the control horns set in the same position. They appear to be in the same position when down or up. What could be the problem and possible solution?
Reduce the right flap travel a few notches. Just because they look even when deployed does not mean they are. This should correct your left turn problem.
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Old 06-26-2014, 04:35 AM
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Thanks guys.They are connected by short 2-56 rods and there is no mix. I am flying somewhere around 1/4 throttle when I drop them with the gear still up, at that speed dropping them to 25% causes the plane to drift off to the left and full delection causes a banking left turn. I am using brand new futaba digital 5151 servos running on 6v. I will try reducing the right one and let you know what happens.
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Old 06-26-2014, 05:30 AM
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1 of 3 things as I see it...the flaps are not deploying the same. There is a mix with ailerons or rudder. Or the 2-56 rods are to flimsey causing one flap not to deploy the same as the other. You wouldn't see this without a load on it.
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Old 06-26-2014, 07:48 AM
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All good tips thanks. I have the 60 size P-40 with split flaps and no issue there, pretty much the same setup. If there were more of a gap between the flap leading edge and wing trailing edge would that potential issue? Now that I look closer it seems that I did not get the one flap hinged as close as the other.
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Old 06-26-2014, 07:59 AM
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Something that might add to the actual problem........how is the lateral balance?
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Old 06-26-2014, 09:21 AM
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It seems to me you are overthinking this. 50 years of airplane stuff tell me that 90% of flying is experimentation so don't worry about why it's happening. Reduce the travel on your right flap until it flies straight a level when you drop the flaps.
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Old 06-26-2014, 06:34 PM
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Flaps cause pitch up moment so you might be getting some kind of stall activity, too! Methinks you have unequal throws or initial flap settings.
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Old 07-02-2014, 09:14 AM
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Well I reduced the throw on the right flap and still no difference. I also trid increasing the throw on the left but still no change, so I will try and get an angle gage to see what the degree of deflection is.
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