what mini servos can i use for stab & rudder?

the instructions call for reg servos OR mini servos if installed in the tail but they don't spec torque or anything...

this is my first electric powered sailplane, i will install the servos in the tail but have no idea what servos to use
(don't need digital, just good strong mini-servos)

thanks for helping,
V.

It would be easier to help if you would tell us what airplane you're working on.

If it's instructions call for regular servos, then it might be a 2m or standard, but who knows for sure. Based on the standard size suggestion, Hitec's Mighty Mini 225 is an excellent choice for most 2m/standard airplanes. It's under an ounce in weight, whereas most standard servos are usually just a bit over 1.5oz. And it is as strong as most standards.

I put a JR-341 in the tail of my 3.7 meter DG-800 a few years ago, and its far from the strongest or fastest mini servo available. Initially I was worried about room, but after I removed the tail post and got in there, I found there was tons of room for the servo and the shortest arm, and I ended up with plenty of throw as well.

Its really basic- make a short pushrod, zero your radio trims and subtrims, clamp the elevator in its neutral position, and put a 1/2" dab of Goop on the four corners of the servo. Put it in place, and let the Goop cure. Next day, turn your radio on and check that everything came out zeroed, and youre ready to go. If the servo needs to come out, a pair of long needle nose pliers will allow you to twist the servo free and try again. If everything looks good, glue your rudder post back in, and reinstall your rudder. I had a very minor change in CG as well.

This is 3D glider MAD FOX made by JR.
I would call it the answer to 3D Kulbutin.

Wingspan: 74"
Length: 54"
Weight: 60 oz.
Airfoil: RITZ 1-30-10
Wing area: 615 sq.in.
Wing loading: 14 oz/sq.ft.

I have the "standard" alev. version NOT the full flying stab as shown in the pic

darock, i was thinking about the Hitec's Mighty Mini 225 but i've heard stories about the plast. gears stripping & the metal g. being sloppy and heavy... is it true?

On the Fox, a friend of mine Steve Lang (aka "Surfimp") had a Fox from S2g and he had a hard time getting the pushrod to move the raked-back fin with any accuracy. I think he ended up with a servo in the fin in the end.

The small size of that thing might complicate things however. A 225 may be too thick. Measure, and maybe make a dry-fit test. If I was to take a guess I'd bet youre going to be forced into an HS-81 MG due to size.

That model in the picture isn't what you'd call an "electric powered sailplane"????????????

whatever.......

It that's the model you're planning to use the servos with, the Hitec HS-81 just mentioned will work and probably fit well.

Heard stories? About plastic gears in a 225? The 225s come with nylon gears like are in 75% of all the servos by all mfgs. And metal gears usually only add one or two tenths of an ounce. And no metal gear servos I've used by any mfg have been sloppy. Hitec does have a composite gear set that they use in some of their servos. The composites are something like 5 or 6 times as strong as nylon gears are and weigh the same. I use them whenever I can. I've never had one strip in use, but have had nylons strip. Guess you could call composite gears plastic, but so is nylon.

I think hes right, actually. There was a run about 2 years ago that had real problems with the electronics just giving up the ghost for no reason. If you go back into the archives of RCSE there was quite a thread about them. On balance, I'm very please with Hitec stuff. I think they were crazy to quit making the 555 and Superslim receiver, but I have enough stashed receivers.

My friend Bruce (slopeflier33) used a 225 on the elevator of his Chinese 4 meter Discus with no problems.

thanks slopemeno!

well yes, i think it might be called that> since i do have an electric motor for it & since i won't be uing the 3D elev config...

see new pics. i have the yellow one