If it can fly with a .46 2 stroke, you would sure think your 70 would do the job.
If it can fly with an electric motor, then anything oughta work.
All but the very expensive electric setups that I have ever seen are
extremely anemic. If you pay as much as 3-4 good glow engines for 1
electric setup, then it will work. Maybe that's what they mean, it
will fly with the very expensive electric combos. 70 sure oughta,
but I see they recommend an 80. Or 82, whatever Saito has around that size.