RE: Sig Wonder Build
Dash:
I used a 15 CVA on the OS aluminum mount.
The tank is a 4oz Hayes Slimline, with a 700 nickel metal pack under it. (Helps to get the tank as high as possible in the fuse for good fuel feed.)
The throttle servo's in back by the trailing edge of the wing, and the elevator servo is all the way in back in the stab. The receiver and the switch are accessible through the standard rear, lower hatch. The black tape on the bottom of the stab is securing one of the two antennae for the Futaba 2.4 receiver.
When it was new, I had a small Nicad pack in the same place, and it balanced perfectly with no ballast. The nickel pack required one 9mm FMJ bullet in back near the elevator servo to bring the CG back. If I had it to do over, I'd have tried mounting the battery futher aft and thus wouldn't have needed the ballast in the tail.
My servos are all HiTec HS 81 metal gear micros. If you use micros, don't use plastic geared ones, the vibration will eat the teeth.