My plans had shaped fixed rudders. I built flat ones with moving rudders. I used one rudder servo and tied the two rudders together with a wire. If you look you can see it under the elevator. I found my props from Hobby King. A set with cw and ccw props. I use one battery to two ESC's. No need to disconnect one of the ESC red wires. Mine works great. Here's a link to your OV-10 build
https://www.rcgroups.com/forums/show...0-Bronco-build Have more info if wanted.
Skyhawk