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Old Oct 20, 2002, 12:09 AM
Registered User
United States, WA, Kent
Joined Apr 2002
132 Posts
Help! My wing servos stick out of their bays!

Help! I'm building a relative thin-wing sailplane and have had some problems mouting the wing servos!

The manufacturer recommended Hitec HS-85BB+ and HS-85MG+ for the wing servos, which I purchased.

The problem is that the aileron servos sit about 3/16" out of their servo bays and the flap servos sit about 1/16" out of their bays. Will this present a problem with flight dynamics? The supplied covers assume a flush fit. If I make a custom cover, or use a sticker, will this work?

Any suggestions?
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Last edited by Sanman; Oct 20, 2002 at 05:04 AM.
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Old Oct 20, 2002, 04:00 AM
Just a plane Junkie
Portland, Oregon
Joined May 2002
462 Posts
I have the same thing going on with a plane I'm building using the recommended servos (hs-55's). I'm going to cover them with Ultracote or some sticky-backed Sky Shine (like a sticker).

I don't think it will affect performance noticeably. If you have 200sq inches of wing area (im guessing this amount for my 1.5m), the servo area would represent 1% or less of the total. Then say it makes that area 30-50% less efficient... It seems quite insignificant compared to the other flight performance variables.

I'm no aeronautical engineer though
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Old Oct 20, 2002, 05:07 AM
Registered User
Punta Gorda, FL
Joined Apr 2002
4,952 Posts
The thinnest servos are from Voltz and Multiplex and are about 10 or 11 mm thick. They are on the pricey side of the HiTech's. Just tape over the servos and don't worry. You probably won't notice the very small degradation in performance. When the model is on the ground, keep it right side up so the servo bumps won't show. After a while you won't even think about it much.
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Last edited by Ollie; Oct 20, 2002 at 06:31 AM.
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Old Oct 20, 2002, 01:33 PM
An Original!
Joined Aug 2001
965 Posts
Don't forget the new HS-125 and HS-5125 wing servos. Also 10mm thick, good torque and new hibrid gearing. Servo city has them in thier specials section for $74.95 and $119.95 respectively.
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Old Oct 20, 2002, 07:59 PM
Registered User
United States, FL, Starke
Joined Apr 2002
2,259 Posts
...or let them stick out and put plastic covers on them that provide for this. Hobby Lobby has them.

http://www.hobby-lobby.com/servomount.htm and go to the bottom of that page.

Unless your one of the top 5% (and if you were, you wouldn't be posting this here), you will not see any affect on the performance of the plane.

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Old Oct 20, 2002, 08:09 PM
TLAR Black Belt
ejett's Avatar
Athens, LA, United States
Joined Apr 2002
1,251 Posts
Hitec Wing Servos

The pricing that was quoted to you from servocity is for pairs of servos. That would put the 125's at about $35 ea. and the 5125 digitals at about $60 ea.

The 125's are what I'll be using on my next project.

I'm not good enough yet to appreciate the extra perfomance of the 5125's.
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