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Old 12-03-2013, 08:43 PM   #1
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Default Adding Ailerons (Servo on top or under Wing)?

Hi again,

Bought a Pico J-3 Stick Slow Flyer, want to add ailerons, have servo's and 4 channel receiver, do I mount servo's on top or bottom (under) wing?

Thanks Bruce

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Old 12-03-2013, 08:48 PM   #2
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It looks best on the underside - that way you don't see them.

Don't go too overboard - they really don't do much good on that plane but a fun project to play with.
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Old 12-03-2013, 10:06 PM   #3
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I know it's not best cosmetically but I decide based on limiting snags in the grass etc.

Under wing if Top-winger...

Top of wing on low wingers and deltas.

The only time I don't follow that is when I have wheels etc. and model is a hard surface RoG job like my Mig3

You can of course use a single servo centre of wing and torque rods ... then servo is well protected ....





Idea ...

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Old 12-04-2013, 03:38 AM   #4
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I put em top deck for belly landers like the small edf's . Actually learned that from Nigel. Jammed enough servos in the grass to know. Have ground clearance ? then under the wing. I have the center wing torque rod setup on the Deuces Wild. Works nicely

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Old 12-04-2013, 06:00 AM   #5
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Doing a mental inventory of planes I've built, I see that I've put them on both top and bottom. It really does depend on the plane, as everybody's said.

I try to keep the servo arms, pushrods and whatnot off the ground, so on a belly-landing flying wing, I'd have everything sticking up.

On a recent biplane build OTOH, I put all the servos in the bottom of the upper wing, with the arms sticking down, which makes them harder to see.

In many planes it's a matter of taste.

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Old 12-04-2013, 06:41 AM   #6
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The centre torque rod system is actually better than most give credit ... it's down to proper tube fit to rods ... and geometry.

You have a single servo ... it's hidden out of sight ...

It is also possible to have a servo central fitted but operating ailerons by spanwise rods or nyrods / Bowden .. so you still have same horns and connectors out there.

But as Dawk says - gear stuck out top of wing saves all those stripped servos etc. on belly landers.

Here's slideshow link to my conversion of bottom mounted servos on 50mm T45 :

http://s6.photobucket.com/user/nluth...%20servo%20mod

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