RE: CA models Extra 27% or 31% for mvvs 58?
I don't know what you guys are thinking, but the MVVS 58 is absurd for a "12" lb 78" plane. Even the MVVS 45 is too much for it. I had bought the MVVS 58 for my 87" Yak and decided it was too heavy and big for that airframe. Other people are flying this combo, but I opted for lower wing loading instead of insane power....for what, I ask? The MVVS 45 I ended up putting in this 17.25lb plane is unlimited vertical with good pull-out from a hover....and its brand new. The 31% CA is supposed to weigh in the 18.5 lb weight range, so add a 1-1.5lbs for reality, and that's absolutely perfect for the 58, and it will still be a rocket.
The 58 will produce in the 40+lb thrust range, so tell me why that isn't enough for a 20lb plane? Sometimes I think people just get carried away with numbers and lose touch with reality. Put it in the 31%, you'll be thrilled with it.