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   Post on Uncommanded Roll on Full Flaps in Avidfoxflyers General Hangar

   By Osprey220, posted 26 Jan 2018

   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: