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-   -   Adding Ailerons (Servo on top or under Wing)? (http://www.Wattflyer.com/forums/showthread.php?t=72718)

RVDriver 12-03-2013 08:43 PM

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

rcers 12-03-2013 08:48 PM

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.

solentlife 12-03-2013 10:06 PM

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 ...


dahawk 12-04-2013 03:38 AM

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

mclarkson 12-04-2013 06:00 AM

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.

solentlife 12-04-2013 06:41 AM

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 :



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