outacontrol41,

I think the 1.25 would be plenty of power. I have one in my FuntanaX 100 and it is 12.5 lbs and it does fine. It's not the greatest for vertical but then it weighs 2.5 lbs more than the heaviest Twist 150 combination. If I were to recommend one and you wanted to be sure you had everything you could want, I'd haqve to say then do as I did and go with the 1.50. Beware I've flown just a little and with a 24oz. fuel tank my 1st gallon of fuel is almost 2/3 gone. The 1.50 sucks the fuel much more than the 1.25. I'm hoping that after it's completely broken in and I can lean it out it won't hurt the wallet as much. Better start buying by the case if you go 1.50 or bigger. What I meant about I would of gone with the 1.25 is the manner in which I fly. I'm not into real heavy duty 3D. If you are by all means get the 1.50

Gibbs