I am assembling a Razor 3D at the moment myself. Mine has a Kangke .50 with a Perry carb. (adds about 10% more RPM)and Bisson "Pitts"muffler. I have had luck with this engine using an 11 x 5 APC (that's what I run on the TT Pro .46 in my Saratoga40) and I will start there and see as well how an APC12 x 4 does for 3D.
Not a bad ARF at the $120 current price. I had some problems with the hinge slots being badly out of alignment for the elevator halvesand opted to go with Du-Bro Nylon pinned hinges epoxied in place throughout instead of the CA so Icould get the control surfaces even with the stabs. I'm thinking it ought to be a great sport model, if not 3D on this engine.
I'm really curious to see how the thin wing profile does with all the control throws possible. My other 3D capable models have a relatively much thicker wing. This one is like a pattern wing with a 3D empennage - it's almost a "flying" rudder.
