RE: GP Waco?
Actually, the most perfect engine for the Waco is the OS 160 twin. The problem with that engine is the price. they are going for 900 bucks. With a .91 or 1.20 four stroke, you are going to need to dive to gain inertia (just like with the full scale). You wind up trading altitude for airspeed in order to do basic manuvers. But you have to do that with the full scale, or at least you had to do that with my Grandfather's YMF. The only roll was the Barrel Roll, and to loop, you had to dive (a lot). There is a lot of parasitic drag with this one, especially if you add the flying wires. I have one with the OS FT160, and another with the G-26. These are both Stickbuilt, and the one with the G-26 has been modified to the point where it is no longer the same airplane that was kitted by Pica. There is not one part that is the same as the original. Even the wing plan is scale. It is going to hit the scale at somewhere around 17 pounds (all up).
Bill, Waco Brother #1