Robert whitaker Posted April 30, 2021 Share Posted April 30, 2021 i am fitting ailerons and flaps to a previously rudder/elevator model. question, before i cut the wings in half, how much dihedral can i get away with without affecting aileron performance span is 78" section is about a clark y chord tapers from 9" to 6" i don't want a flat wing as they look "droopy" and it's a "looks like" a real sailplane thanks bob Quote Link to comment Share on other sites More sharing options...
David Davis Posted April 30, 2021 Share Posted April 30, 2021 There's a chap over on RC Groups, George Stringwell, the former British and Irish r/c glider champion who has a formula for dihedral on vintage models converted to r/c: one inch for every foot of half span plus one inch. In your case, the half span is 39" or just over three feet. So according to his formula you should have 4" dihedral. As you are fitting ailerons, 2.5" to 3" should be alright. Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted May 1, 2021 Share Posted May 1, 2021 The effect any dihedral may have on ailerons will also depend on their size both in length and chord. The other aspect is what sort of roll rate are you seeking. Many full size gliders are not permitted structurally to roll so aileron performance tends to be 'tuned' to give a desired control response whilst limiting adverse effects. About the only thing you can say for certain is you wont need as much dihedral as for rudder only! I would suggest halve what it had and see! Quote Link to comment Share on other sites More sharing options...
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