Now I have it on GWS B drive. Funny thing, it doesn't want to run, when ESC is powered from 3s LiPo. It just stops when I apply more than 1/3 throttle. On the other hand it works fine on 2s LiPo.
So here is my setup (the best I got):
2s 340 LiPo
GWS B drive
GWS 7x4.3 slow fly prop
Everything on the plane 24in wingspan and 240 sq in.
The airplane RTF total weights 5 3/4 oz - I love this 3.5 oz/sq ft wingloading
at 3/4 throttle at 3.5 A the thrust balances the plane (5.75oz).
at full throttle and 4.5 A the thrust is about 2 oz more. I can live with that. It should give me flight time only 5-8 min
I didn't measure RPM, but calculating power from HP calculator I guess the efficency is about 75%. Good or bad?
Still original magnetic ring.