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Wing mounted servos

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Old 04-10-2008, 11:37 AM
  #1  
Tango Juliet
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Default Wing mounted servos

I'm looking for techniques/tips for installing aileron servos in a wing so that they are either recessed, or hidden behind hatches with only the arms sticking out. I'm modifying a SS60 with seperate aileron servos and I'm having trouble visualizing[sm=71_71.gif] how to go about doing this with the cleanest look. Construction photos would be greatly appreciated.
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Old 04-10-2008, 12:39 PM
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Default RE: Wing mounted servos

Here is how I did my 4*120 wing. I used white pine for the brackets to mount the servo's
I had to make some fancy ones for the flap servo's because of the tubes for servo leads.
Hope this gives you some ideas
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Old 04-10-2008, 01:28 PM
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Default RE: Wing mounted servos

Thanks. I really like the arrangement of the flap servo. It makes for a short linkage. Originally I wanted to have the servos on their side with only the arm coming through a slot, but your idea seams a little simpler to reproduce. I'll have to see what others post, but I'm intrigued by your setup.
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Old 04-10-2008, 08:27 PM
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Default RE: Wing mounted servos

I used 1 servo and 2 flexiable guided wires. The yellow guide tube is in a recessed groove which is filled in.
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Old 04-11-2008, 12:12 PM
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Default RE: Wing mounted servos

I use a piece of ply the thickness of my sheeting (or 1/16" if it is a covering). I build a support frame in the wing from basswood. If the wing has a covering be sure to recess the support framework so that the ply is flush with the surface.

Cut the ply to fit the opening. On the inside of the ply CA a piece of 1/8" lite ply (make sure to allow for the support framework). Then mark the location of the servo on the lite ply. Cut a slot for the control arm and using MEDIUM CA (or epoxy ) secure 2 pieces of 1/4" square basswood to screw the servo in place (make sure you drill 1/16" holes to prevent splitting). Drill 1/16" mounting holes through the ply AND support framework (be sure to enlarge the holes in the ply so the attaching screws do not bind).

When you remove the hatch/cover the servo comes off with it. Makes life easier when you need to work on (or replace) the servo.

FWIW - This is the method used on the SIG Rascal 40.
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Old 04-11-2008, 12:35 PM
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Default RE: Wing mounted servos

How about the technique used by Great Planes on their .60 Cub.

the manual
http://manuals.hobbico.com/gpm/gpma0162-manual.pdf

Page 26. its very simple and looks good too. Just plan to have the servo between ribs so depth isn't a problem, then re-enforce the ribs on both sides suitable to sink some small wood screws into to mount the plate and your done.
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Old 04-11-2008, 03:49 PM
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Default RE: Wing mounted servos

I just finished a plane with recessed servos as well. The servos are inside the ribs, horizontal. I made a ply reinforcement to outline the rib and the servo arm is all that sticks out. Here are a couple of pics. If you need pics of what it looks like with the door off let me know. the only tricky part is getting a clean shot to the control surface without hitting the door.
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Old 04-11-2008, 04:01 PM
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Default RE: Wing mounted servos

If you could just remove three screws and rotate the hatch out of the way, an interior shot would be nice.
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Old 04-11-2008, 05:42 PM
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Default RE: Wing mounted servos

I will get you a pic tomorrow.

I was born and raised in Mobile. I flew at your club for a few months when we were back in the US in 2005.
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Old 04-11-2008, 05:53 PM
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Default RE: Wing mounted servos

The link that superflea provided is exactly what I was trying to explain.
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