Is 140 degrees too much for a V Tail Glider?
I’m rusty at math, but looking at building a 1.75 meter electric glider with a V tail instead of a conventional tail. The area of the fin and rudder is 22.5 sq in. The area of the stab and elevator is 61.3 sq in. 22.5/61.3 times arctan gives 20 degrees from horiz. Multiply 20 degrees x 2 and the angle inside the V is 140 degrees! My only other experience with V tail gliders is my nanoplane falcon which has an inside angle of 110 degrees. I went to the DJ Aerotech site and studied their materials to come up with the above “constant control authority” method of calculation. Each of the resulting panels should have an area of 41.9 in sq per their calcs. Those of you that have v tail sailplanes – what is your inside angle? 140 degrees seems high (flat) to me.
