Basically the engine and servos, etc. weighed more than the scratch build plane. MVVS 40 and pipe are not light when trying to make this work. Balanced, yes. To much torque, yes. fun to fly, no. You can never relax for one second.
This plane previously had a MVVS 21/with pipe and would not go verticle unlimited, that little 21 puts out more than an FSR OS 25 I would bet, I do have an FX 25 so know how that works.
So you don't misunderstand, I have a scratch built Morris Knife with MVVS 45 on it, a great combo that does it all and never lacks for power, plus it actually glides on deadstick, unlike the penknife w/Mvvs 40, that starting to settle when power is lacking.
I like lots of power but I did not enjoy this setup at all.