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Hat-tip and credit to Dan Marchetti, the former owner and builder of my B STOL for this repair he designed to the Rib trailing end to which the flaperons attach. He did this mod to all 5 ribs on the left wing. I installed on on the outboard Right wing which I found cracked. I like to call it the Marchetti Flaperon Bracket Mod
Avid Flaperon Mod.zip
The tip spreader referred in the files above is a necessary add if all brackets (in the case of this wing) broken at once and is affixed to the end of the trailing spar and to the inside of the aft of the wing tip. Your situation may not require it.
avid_flaperon_mod_12-21-2020.pdf
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Hi Guys,
I'm a new member - in the Davis/Woodland California area.
I've been helping a friend get his Kitfox Model II (Rotax 582) flying and correctly rigged - and having lots of fun flying it too.
But with the fun has come a bit of undesired sphincter puckering excitement.
A couple of weeks ago, the flapperons went into full flutter at ~75mph! Recovered quickly with pulled power and gentle up roll. Yikes.
I found a lot of slop in the remarkably complex control linkages I could tighten and remove. Additionally, the shoulder bearings on the flappers were not tight and I've fixed that. So far, no more flutter.
BUT -
On full flaps, I get a uncommanded and _almost_ uncontrollable roll to the left. Almost full right aileron controls the roll, but it does not seem like a condition I would want to approach landing in! Half flaps seems fine with no roll tendency.
Any insights or suggestions?
I did a quick search and have seen that other mention limited roll authority on full flaps, but no mention of uncommanded roll.
I've also posted this to the TeamKitfox forum - I really need the help. Sorry if you've seen this twice.
I look forward to your input.
Also - if there are folks around wanting to fly out, get in touch.
Cheers,
Owen Hughes
Attached is a picture of the plane: