Mitch,

good to see you around the forums again. You're going to love that engine if you haven't flown it yet. Very elastic, amazing high end brute power and not critical on the carburetor. I've been able to get it to idle, factory settings, at under 2K rpm on a pretty light Rev-Up 11x7-3/4". Snap the throttle open and it will hit 15K almost instantaneous. Props do make a big difference on how it behaves so try a few out. I've liked the Falcon wood props that are similar in design to the APC's. Xoar's are good too but heavier and better if you want to turn a larger 12" prop in which case the Speed drops down to a more typical long stroke. The high timing of the engine is what makes it remarkable since it is also a long stroke. Top end rpm on small props (11x7, 11x8) but excellent lugging power on large props (12x8, 12x10). All in all a very flexible, well natured, easy to start RE engine.

You'll notice that the mixture control is not very senstitive which is where it should be at. The threads on the mixture needles is typically very coarse so that a small movement of the servo will cause the needle to turn the equivalent of 1/4 - 1/2 a turn. In the case of the Speed, I think it is closer to 1/4 turn and the engine is not very "peaky" so it is just right for adjusting the needle depending on the fuel level in your tank.

BTW, the standard NR fuse top header has a 1-1/8" rise (C-to-C) which might be a better fit for that particular model. You can still angle the pipe up slightly if needed by bending at the coupler.

Keep us posted on your flights!

David

P.S. What is that bird?