I Have A 46FX In Mine And I Fly Most Of The Time At 1/2 To 3/4 Throttle And Get Very Good Flight Time.
I Am A Believer In That It Is Better To Have It And Not Need It Then To Need It And Not Have It.
I Would Use The 45.I Have A Fox 29 That Was Very Used In 1974. I Still Fly It.If The Manufacture O.Ked It I Would Use It.Put It On A Test Stand To Check It Out.
It Is A Great Ship.My Favorite.
[8D]