I've got a Sopwith Pup bi-plane that I would like to replace the aileron servos on. This design uses two servos, one at each wingtip to drive the ailerons. So each servo drives the lower and upper wing ailerons via a pushrod from the lower aileron to the upper aileron.

During crosswind landings, this type of aircraft (slow flying, floater type scale airplane, about 14 pounds) has been known to scrape and/or hit the lower aileron on the runway, causing a jolt to the servo occaisonally.

I'm concerned about damaging nylon servo gears and want to upgrade to metal gears or carbonite. I don't need anything much faster than a standard servo because this is not a fast airplane (WWI Scale). I also don't want a lot of current drain because I'm only using a standard 4.8V pack that came with my reciever, so current drain much higher than a standard servo is not attractive. Can you recommend a servo for this application?

Also, what is your feeling on when I should use a choke, or buffer, or filter on the servo lead lines? This airplane puts about 36" of wire running from the reciever to each aileron on the wing tips. I've seen some jitter occaisonally with my standard servos, but thought that maybe I should just go to a heavy-duty extension to prevent voltage drop. What is the difference between a choke, a "booster", and a buffer/filter? What does Futaba offer in that line?

Thanks!