Hello Pete X:

Makes tears in my eyes, when I have to agree with Ken! However with models up to 1.3 cu. ins and even bigger for moderate scale-like flying these servos will fill the bill for 2 on aileron, one each on elevator, throttle, and rudder.

You may wish to check out specs of Hitec servos 425, 475, 545, 625, and 635. (http://www.servocity.com/)

All the hype for digital 'umpteen #s of torque servos is strictly marketing-hype to get into your wallet. I cannot say that for the 40% 3D block-the-runway types because there I have no experience. However in my observations from the days when our competition pattern models with 4 servos, just one for the ailerons, and even our fast Formula I pylon racers also just 4 servos, got the job done, until the current digital craze, and having flown 1 to 1 scale, for 41 years, some without even power boosted ailerons, other than arm boost, , I think it's the old cliche of, "Mine is bigger than yours," that keeps modelers buying the biggest they can obtain.

This model, 101" w/span, 28#, machine Zenoah G-62 electronic ignition has served its purpose for some 10 years with two Hitec 425 equivalent servos on the ailerons, and one 605 (now 635) on the elevators, with standard servos on rudder and throttle. Definitely good enough for me.


The red machine flew well also with about the same line-up except 2 605s on the elevators. It got sold after serving me for about 3 years. 1.20 2 stroker. 72' w/s.