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FireFly Stall Pre-Buffet

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jbhart(at)onlyinternet.ne
Guest

Posted: Tue Feb 24, 2009 10:25 am Post subject: FireFly Stall Pre-Buffet

Kolbers,



Before I offset the thrust line, the FireFly would stall/mush straight 

ahead.  After I lowered and offset the thrust line to get more air over the 

horizontal tail surfaces and to center the ball without a tab on the rudder, 

things changed.  The thrust line has been moved to the left.  This gives the 

left wing a little more lift than the right.  At idle and pulling the stick 

slowly back the FireFly right wing will buffet lightly and then falls off to 

the right.  With power on, the buffeting is much more pronounced.  It gives 

an early warning, to not pull the stick further back.  If you do, it will 

continue to buck with increasing amplitude until the right wing stalls 

continuously and over you go.



This is the disadvantage of an off set thrust line to trim out the FireFly 

at cruise.  Use of a rudder trim tab instead of offset thrust line would 

solve this problem.  



Jack B. Hart FF004

Winchester, IN

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