stanh
Active Member
I am nearing completetion of a Kelly D project that was started in the mid 80's then set aside. When it was picked back up, the decision was made to mount a Rotec R3600 150HP radial engine and round the fuselage, etc. Doing some preliminary weighing of the components of the plane, it is OK with the 1600 pound gross weight that is listed on the plans but I would like to consider the gross at 1700 -- maybe even 1750. I have the horsepower to handle a little more weight and am installing Bruntons flying wires -- so feel OK there. The question I have is in reference to the wings and their strength. They are 50 inch chord with the airfoil based on 23012 (modified Taylorcraft) and wing loading is 6.95 pound per square foot based on the 1600 gross weight. The spars are aircraft grade spruce -- the front one is 5x3/4 inches and the rear one is 3 1/4x3/4 inches is size. There is no information that is on the prints or that I can find on the computer on design strength of the plane. The designer (Dudley Kelly) is no longer with us and I can't find any contact information on the design engineer. Mr. Kelly worked on the design/drawings of the Hatz planes and designed the Kelly D to be a simplified Hatz. The Hatz CB-1 has a wing loading of 8.15 pound per square foot and the Hatz Classic has a wing loading of 9.44 pounds per square foot. I don't have any information on the Hatz wings physical structure to make any comparison as to what Mr. Kelly designed into the Kelly D.
With all that being said, I would appreciate any comments.
Stan
With all that being said, I would appreciate any comments.
Stan
