Thread: Discussion Plank 101
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Old Sep 30, 2012, 05:55 AM
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Originally Posted by Quick61 View Post
Yea, I kind of liked that first one my own self. As to the fin, on SAL and DL type gliders, there is a lot of force being put on the fin/rudder during launch. I have blown off more than a few tails when I started in building DLG's, that and cracked tail booms. From the looks of the tail Kent has drawn, to hard of a discus launch will put a lot of stress on the joint where the fin meets the boom. That's why you see the vertical tail surfaces on DLG's above and below the boom in almost a balanced side loading. With all the surface on top, it has to be very, very strong or it will fold over like a wet noodle or twist the boom till it cracks.

Thanks Mark.On the first two you showed the tail area is horizontal rather than vertical,I presume to get around the problem.Less efficient than the same area vertical?
On that last pic it looks as though it could be vulnerable on a less than perfect landing.
Regards Stuart.
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