john marsh Posted December 12, 2007 Share Posted December 12, 2007 I am building a chorus gull from RCME plan by Brian Peckham Feb 02 I have aqurery with the wing washout the plan asks for the rear spar to be built on a 3/8 packing strip from ROOT TO TIP to give correct washout does this mean 3/8 for the full length or 3/8 tapering from root to tip I will be pleased for any help my email [email protected] Quote Link to comment Share on other sites More sharing options...
Erfolg Posted December 12, 2007 Share Posted December 12, 2007 I am suprised that Timbo has not answered this one.I do not know this plan. But it is normal to go from 3/8" at the tip to 0" at the root. As a a geometric shape you could call the packing peice a wedge or triangular shape. Both panels to be built identicly to each other as reflective images The genral idea is to build into the wing a warp, the purpose of which is to ensure that as the wing reaches a stalled condition, the roots will stall first (simultaneously) and the wing tips to keep on generating lift. This results in a benign stall or mush. Whereas if the tips or tip stalls, the result is usually a spiral dive until airspeed is regained, or the ground struck. Far better to have a lower efficiency wing away from the stall, than constant care during landing.I understand that aerobatic models have no wash out, as it is desirable to be able to stall the wing at will, and have the same flying characteristics when inverted.Erfolg Quote Link to comment Share on other sites More sharing options...
Former Member Posted December 12, 2007 Share Posted December 12, 2007 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
john marsh Posted December 13, 2007 Author Share Posted December 13, 2007 Erfolg&Eric thanks for the info i'll try to avoid the crunch Eric Quote Link to comment Share on other sites More sharing options...
Douglas Butterworth Posted January 11, 2008 Share Posted January 11, 2008 Hi i have been trying to build these wings and i wandered about the same,did you notice drawings of two of the wing ribs missing and the wing ribs drawn are a different size to whats on the plan,just a thought.D Quote Link to comment Share on other sites More sharing options...
Douglas Butterworth 1 Posted August 29, 2013 Share Posted August 29, 2013 Hi all i am still wrestling with this plan i am a slow builder lol,lol, no i have been building other things in between any way has anybody resolved this problem yet ?weather its 3/8inch packing from root to tip or just at the tip?again was there a missprint?some of the wing ribs are not the same dimentions as printed on the wing plan as opposed to the profile for the rib template so i am still open to any sugestions looking forward to hearing from anybody who has built this model to throw some light on it,doug Quote Link to comment Share on other sites More sharing options...
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