ORIGINAL: Ed_Moorman
My buddy, Flaps Laffert, and I are on our 8th canard, all of them his designs. We have done pushers, tractors, a pusher twin, a tractor twin and a flying boat. We use positive 3 degrees in the canard.
My advice is to use a large canard (25%-40% of the wing area) and make sure the plane isn't tail heavy.
I am at 174sq.in. for canard and 654 for the main. Just made it over your 25% mark. Now that you gave that as a minimum, do you think I should increase the span of my canard (I want to keep the same chord).
Thanks for the 3% suggestion. What about the .05 Cm that I mentioned. Is that a rule you all have used?
I started with Rutans airfoils and worked on them until I got the Cm I wanted and stall ratios (main to canard)
Used Profili Pro V.2
My twins are about 3.75 inches from the CL in yaw. What do you think about engine loss p-factor? The only vertical stabilization I am having are the exhaust stacks being vertical and in sym. airfoil shape. Rudder is extensions from inside the outer portions of the wings (flat plates introduced downward into the air stream) what does your intuit say?
Do you have pix of your canards on the Internet somewhere?
Thanks a million for the input, information and help.
Ionikios