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Flap / Elevator Mixing

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Old 05-05-2010, 12:38 PM
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mooseflyer
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Default Flap / Elevator Mixing

I recently finished one of the great planes cherokees, and decided to install the flaps. I like the scale look while landing with the flaps down, as much as the functionality. However, this plane exhibits a considerable amount of "ballooning" when the flaps are used. I've got a radio with mixing capabilities, but have never tried mixing flaps with elevator to help correct some of this. Any suggestions would be appreciated.
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Old 05-05-2010, 12:42 PM
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Default RE: Flap / Elevator Mixing

What radio do you have?
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Old 05-05-2010, 12:42 PM
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Default RE: Flap / Elevator Mixing

Tower Hobbies 6XM
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Old 05-05-2010, 12:50 PM
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Default RE: Flap / Elevator Mixing

The programming of the radio shouldn't be a problem. I guess what I'm trying to ask is how much elevator to mix in.  I would assume down elevator, but I'm not sure how much.  I also assumed it would depend on the flight characteristics of the plane, so a ball park would give me a starting place.
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Old 05-05-2010, 12:52 PM
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Default RE: Flap / Elevator Mixing

It is not uncommon for the plane to balloon when you deploy the flaps. You can limit this by slowing down as much as possible before deploying the flaps

The question is: Once the flaps are deployed and the plane slows down and settles in, does it fly nicely? If it does, do not mix elevator into the flaps.

If however, you find that the plane wants to fly "Nose-Up" with the flaps deployed and you must constantly hold a little down to keep her level, then you can try adding about 6 - 8% down elevator to the flaps
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Old 05-05-2010, 12:59 PM
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Default RE: Flap / Elevator Mixing

It flies nice and steady once it "settles in".  Thanks a lot for the info.  I'll try to slow down more before deploying them.  Also, I have a proportional knob for the flaps.  I'll try putting them down in stages along the landing pattern.
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Old 05-05-2010, 04:42 PM
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Default RE: Flap / Elevator Mixing

On a GP RV4 I had to compensate with down elevator mixing. I used about 19% down for my ballooning. Problem rectified. Also wait to deploy your flaps until you are set on your glide path ... you may not need elevator compensation due to slower airspeed.
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Old 05-06-2010, 09:50 AM
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Default RE: Flap / Elevator Mixing

Thank you for your input. 
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