FlyStraight

I think you need only like 90oz/in torque servos for 30cc planes. There are lot of choices out there and most servos fall in the $30 to $40 category for 30cc planes. You might put a hitec 7955 or 5955 on the rudder. I read that there is a problem with the new 7955 servos when using them on straight lithium batts with no regulator. I don't know if the problem manifest itself on 6v overtime. Hitec is looking into it but the old 7955 and 5955 are problem free. Personally, I would go with a ts-170 (old 5955 hitecs) on the rudder and maybe ts-150 or something like that on the other surfaces. A cs64 on the throttle, it's analog with karbonite gears and I had mine for 140 flights on my gas 50cc with no problems. I do run a gray nyrod for the throttle that seems to absorb vibrations. I have ts-170's on everything on my 50cc plane running on 6v nimh. Will definitely go with a123 batts in the future. My friend used the ts-150s on the elevators and ailerons on his 50cc electric plane with no problems with one ts-170 on the rudder. That's $245 bucks minus $35 tower member coupons for $210 total divided by 6 servos that's $40 per servo, not a bad deal plus you can take those servos and put them on the 50cc plane down the road. The ts-150's are futaba servos and ts-170 are hitec and both have ball bearings and have metal gears with ts-170 having titanium gears. You could also do better and or cheaper with other make/model but I'll let others chime in.