Interesting you mentioned the servo failure possibly due to engine vibration....I have a 33% Yak54 with the ZDZ80 RV which I've had for many years. I have 5645's on each elev surface which has always been plenty of torque and speed for that plane. about three weeks ago I had one of the elevator servos just quit while on the ground doing engine run ups. At low idle this motors shakes the crap out of the air frame and a buddy and I were discussing how violent it appears to be on the elevator surfaces when on the ground. Then the failure occurred days later, thankfully on the ground. That would have been a handful. It's hard to say if that was the exact cause. The servos have been in the plan for at least 6 years however not flying for several years. Age or vibration??? that is the question. The electric B model will be an awesome setup for power as always. I just cant stand the short flights and lack of sound on a warbird. However, you will really be able to nail down the scale appearance!.
My motor showed up:
