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Old Apr 07, 2013, 10:03 PM
Transplant in 1996
United States, NE, Scribner
Joined Aug 2011
195 Posts
Help!
Retrac servo!

I am building my new kit (Great Planes P51B Mustang 57" WS).
My question is: I am using my Airtronics equipment (throttle, ailerons, rudder, elevator and retracts) all using the 94102's. Will my 94102 servo be OK to use on the retracts and ailerons? or do I need to get a larger one's?
ANY and ALL feedback appreciated!!!!!!
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Old Apr 08, 2013, 10:09 AM
Registered User
United States, ID, Shelley
Joined Dec 2011
445 Posts
OK on ailerons, but probably not on the retracts, depending on the type being used.

I have used a number of the Standard (94102) servos over the years, including many on faster/heavier planes or larger control surfaces than what you're probably looking at. So unless you're building a real speed demon or are otherwise expecting high loadings on the surface it should be fine.

What type of retracts are you using? If you're going pneumatic, the 94102 would be fine as it only has to operate the air valve. I went to this exact setup after having insufficient power with (2) 94102's trying to operate a pair of of mechanical retracts. They weren't the best retracts, and they had 4" wheels, but the wheels were lightweight models, so somthing had to change.

Over the past winter, I've change out the pneumatics for electrics for more trouble-free operation, which freed up the 94102 for ue in another plane. An upgrade you may also want to consider. Hobby Peple has some decent electrics for @$60 for the pair, and lots of others are on the market now as well.
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Old Apr 08, 2013, 01:47 PM
Transplant in 1996
United States, NE, Scribner
Joined Aug 2011
195 Posts
I am going to use a set of Dave Brown mechanical retracts. They seem to snap in place fairly good. According to Great Planes, the Mustang shood be about 5 1/2 to 6 lbs.
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Old Apr 08, 2013, 01:58 PM
Registered User
United States, ID, Shelley
Joined Dec 2011
445 Posts
You'll definately need more than the 94102's in both power and throw.
Unless you can keep the linkages really straight, you'll probably want one servo for each retract to minimize the length of the control rods. With one servo, it can get real frustrating when only one of them isn't set correctly, you make an adjustment to the linkage, but then the other one is off.
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Old Apr 08, 2013, 09:20 PM
2 Fast 2 Low & 2 Loud
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United States, CA, Winchester
Joined Nov 2011
3,207 Posts
I tried one of the Spektrum retract servos with the adjustable end points. It was nice to have this feature for fine tuning... SPMSA7000 go here > http://www.spektrumrc.com/Products/D...odID=SPMSA7000
and good price here > http://www.amainhobbies.com/product_...FeR_Qgod8nQAhA

It's nice to be able to slow the gear, too.
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Last edited by scootrb4; Apr 08, 2013 at 09:27 PM. Reason: spelling
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Old Apr 09, 2013, 10:19 AM
Registered User
Jacksonville Fla.
Joined Mar 2007
2,214 Posts
Retracts servos are different than other servos the throw is different and the way they throw are different. Research your choice of retract servos carefully
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Old Apr 10, 2013, 07:05 PM
Transplant in 1996
United States, NE, Scribner
Joined Aug 2011
195 Posts
I figured maybe I could use (2) Airtronics 94102's for the retracts, could someone explain how to wire both together with my 6 channel rx.
PLEASE someone HELP!!!!!
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Old Apr 10, 2013, 09:23 PM
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United States, ID, Shelley
Joined Dec 2011
445 Posts
The 94012's have limited throw and power for use in retracts, but a simple "Y-harness" should do the trick. Connects both servo's to the one receiver port.

Just make sure your linkages are going the right way so that both servo's are pushing and pulling the right way at the same time. You'll want to control them with a toggle switch on the transmiitter rather than a slider or rotating knob so that you know the servos have gone their full travel distance and locked in position.
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