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Old Oct 01, 2012, 09:57 AM
Joel K. Scholz is offline
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Kingsland, Texas USA
Joined Aug 2000
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Lee, I certainly cannot claim to be an expert in bird plane design, but I have an idea as to why you might be having tip stall problems. I think it is because you are devoting far too much wing surface area to the ailerons. High deflection rates will stall the wingtip and when 30 % or more of the wing is stalled you will tipstall. While the Kestrel is my first devoted bird plane , it does not have a tipstall problem and its wing structure is far less sophisticated than yours. The v-tail is more effective in controlling the kestrel and ailerons are not even really needed. Why not try greatly reducing your aileron size and fly them with significant differential. I hope you do not mind this suggestion, I realize you have far more experience with this type of design than I do. I might add I have found your thread very inspirational and have already begun designing my next attempt. An 82" Osprey.
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