Predator tip stall.

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Hi ,
Has anybody solved the problem of the wing tip stall with the  predator in a low speed turn and on landing .
Thanks,
Earl.

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geink Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (CA) USERID: 144996 Newbie Joined: 02/Mar/2009 Online Status: Offline Posts: 9	Quote Reply Topic: Predator tip stall. Posted: 23/May/2009 at 8:54am
	Hi , Has anybody solved the problem of the wing tip stall with the predator in a low speed turn and on landing . Thanks, Earl.

congo Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (AU) USERID: 197508 Newbie Joined: 23/May/2009 Online Status: Offline Posts: 14	Quote Reply Posted: 23/May/2009 at 2:45pm
	You can try adding more washout to the tips, outer 25-30% of span. Try to get 15mm or so warped up at the trailing edge near the tip, this will reduce AOA at the wingtips. Tip stall on a long wing should be expected in a low speed turn, you are near stall, and the inner wing has less relative airspeed than the outer wing in a turn, ..... the inner wing will always stall first (in smooth air). In rough air, more speed needs to be carried in any event. There is no reason to make slow turns onto final, it's suicidal on real planes, so why attempt it on models? Keep up your airspeed and safety margin, then wash the speed off once low over the landing area or close to the threshold. Edited by congo - 23/May/2009 at 2:57pm