I'm getting ready to set up the flaps on my large scale H9 Skylane, and since this is the first time I've done flaps I have a couple of questions.

I've already got the ailerons set up, using separate channels, have 2 channels available for the flaps and plan on doing it this way rather than using a "Y" harness. I'm using a Futaba 7C, and plan on using the 3 position switch (G I believe) for up, partial and flull deployment. Alternatively I could use the variable positon knob that is available. Is one preferable to the other?

Assuming I use the 3 position switch, mapping each servo to that switch is no problem, but how do I set flap travel amount at each of the 2 deployed switch positions. Is there an "end point" adjustment that will become available once I've mapped the switch? Seems to me there should be so that you can make sure flap travel is matched on opposiste sides and not introduce roll due to assymetrical movement. I suspect I'm missing something trivial here.

Thanks.

OK, I've got the flaps set up on the three position switch, everything is moving in the right direction and I've adjusted out the binds using the linkages. With the switch in the fully deployed posiiton, I can use the endpoint adjustment on each servo to match the travel. I do not have any adjustment available in the middle partially deployed position. Is there a way to use the radio to exactly match the flap travel at the intermediate position. If so, I haven't figured it out yet.

Thanks for your help.

Bob

Bob,
If you have both servos run off of one channel in the radio then there isn't any adjustment for each flap in the radio. You'll have to mechanically adjust the flaps so that they are even.

As for adjusting the middle setting on the flaps, you should be able to adjust that with the subtrim adjustment in the radio.

Ken

Set the middle first either with mechanical linkage adjustment (preferred) or sub-trim. Then set the end points.

Ken and Bruce:

I am using separate channels for the flaps, and will do everything I can with the linkages to get things even before resorting to the adjustments within the radio. I just wasn't sure how to make any final "fine tuning" adjustments for the partial deployment setting.

I don't have the most nimble fingers in the world, and the mechanical adjustment on these is a pain for me. the flap servos are internally mounted on hatches, and the linkage is all internal. Not much room to work, and un-attaching/re-attaching the linkages to the servo arms in the hatch opening is very awkward.

When all is said and done, how close do the travels need to be to not induce roll when deployed? Should I be targeting +/- 1/16th? Less?

Thanks,

Get them as close as you can and use sub trim. Get them as close as you can and deploy the flaps up high and see what happens.

You probably will not get them perfect without flying it and trying them. Go to a high altitude and deploy, see what needs to be done and land. Make your adjustment and take off again. Repeat all steps until level flight with flaps is achieved. Sounds like a recipe huh? Hopefully not for disaster!

Brett and Andy:

Thanks for the input. I'm pretty deliberate with my linkage and travel adjustments, particularly getting things as right as possible mechanically so they'll be pretty close before it ever goes in the air. The flaps are HUGE, though, and I just don't have a feel yet for what's acceptable and what is not and as I said the mechanical adjustments are a pain. Granted, they are inboard but they really dwarf the ailerons.

Thanks.

No worries, once you get them close mechanically you can tweak the sub trim and get them perfect without tinkering with the linkages.