boosted 180
You are trying to go against the industry's general desisn directions here in my view. The larger airplanes sinly need more torque to pull and hold the control surfaces. A edge is a very airobatic airplane, so I assume you intend to fly airobatics or 3-D. In 3-d, the servos actually hold the airplanes near full weight in knife edge, harrier etc. So a 4-5 pound airplane is putting about that weight on the contgrol surfaces. There are some mini survos that doubled up will pull and hold approporiately. Something like a JR DS 3241 that cranks over 60 oz power may do the job, but you will not like the price, around $80.00 each, correspoinding Fatuba about the same. My Banshee, about the same size has JR DS 8411, and 8611 on rudder, all over 200 oz. And yess, I can feel the difference from those and say standard servos. I for one resisted the high dollar, high power digital servos until, I flew a buds exact airplane. Night and day! Mine equiped with good servos that week simply because of the difference in flying character. Your little servos on larger airplanes are working very hard just to hold the surfaces up, much less move them. You re going to pay the price in lost airplanes, sooner or later, and I suspect sooner. The small ones are simply not designed to take the forces you are placing on them. You are much better off going with a good standard servo with 60 or so oz minimum. For what it worth, I started in RC in the late 1960's in my 30's. Having been arround for so long does not make me the brightest bulb on the tree, but at least experienced. Hate to see good birds in pieces. Hope others will give you about the same information.