I just "built" one. Since I had 4 Futaba BLS-157's, I used those on the ailerons, but used a single Savox 2231 on the rudder (push-pull) and a pair of 2270's on the elevators. On my servo torque tester (2S Lipo powered), the -157's pulled ~31 pounds (with a 1 inch arm, that equals ~495 oz-in), the 2270's about 25 pounds and the 2231 about 26 pounds. Don't toss the nice M3 flat socket head screws that come with the Savox that are intended to mount the servo on r/c cars, they work great for the links as well! I used a Hitec 5685 on the throttle, all on 8.5V.