I just finished my Twist. I put a Magnun 70 4stroke with a 14X4 on it. Awesome combo. This is my first 3D plane and so far it's just a blast! Takes off in 10 ft or less and out of site verticle is no problem at all. I haven't learned any 3D manouvers yet, but I don't think with this combo it will be a problem doing anything. I can bring it down to just above idle and bring it in at a walking pace. I bet with some practice I can drop it on a 3 point landing with no roll out. With this motor, I mounted it as far forward on the mount as possible to allow room for the carb linkage and it balanced right on 4 1/2". The manual says between 4"and 5". Should be no problem moving CG back a little once I get use to it more. So far I have nothing but good to say about it.
Smiling from ear to ear,
pETER