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« on: December 01, 2017, 12:23:22 PM »
topalle
Topalle Srinivas Azad
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Hi everyone,
I'm working on a project which is an autonomous plane. Which follows waypoints and is controlled by a pixhawk. So for that, I need a very stable Air-frame and the control surfaces need to have very little play.
Can you post how you make your control surfaces and attach them to the servos?
Till now, I used to glue on my control horns using CA or Hot Glue.
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« Reply #1 on: December 26, 2017, 05:55:34 PM »
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Bro it totally depends on the type of plane. If it's a park flyer and made of foam. Most of us use control horns with  ca. But for something that lasts. I think string driven control surfaces are more precise than control horns.
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« Reply #2 on: December 26, 2017, 05:56:18 PM »
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I mean control rods
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« Reply #3 on: December 26, 2017, 05:56:52 PM »
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So the servos won't necessarily be near the control surfaces
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« Reply #4 on: December 26, 2017, 05:59:42 PM »
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You can use nylon or Kevlar strings as you wish and. The only difference is that there  are two control horns on either side of the surface and two strings attach to the servo.
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« Reply #5 on: December 26, 2017, 06:00:25 PM »
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So how is the progress so far Bro?
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« Reply #6 on: December 26, 2017, 06:02:29 PM »
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This is may help you: it's the real deal.
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« Reply #7 on: December 26, 2017, 07:11:51 PM »
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the control surfaces need to have very little play.
Can you post how you make your control surfaces and attach them to the servos?
Till now, I used to glue on my control horns using CA or Hot Glue.
Hi Srinivas,
Assuming that the TE of the fixed surface (wing, stab, fin) and the LE of the control panels (flaps, ailerons, elevator, rudder) are hard (ie, balsa, not foam), the best way to ensure minimum play is to round the edges that meet, and tie them together with figure of eight stitching using appropriate thread.
THIS HAS NO SLOP AND NO FRICTION. Better than any hinge!

Use 5 min Araldite Klear to stick the control horns into full depth slots in the control surfaces.

Another source of play is the pushrod end (clevis or Z bend) being a loose fit in the hole in the control horn.
To cure this you need a bush in the horn. You can cut slices from the plastic tube in Johnson's Ear Buds  Grin
Hope this helps.
Regards

PS. Let us know if you are considering using cables instead of pushrods. Cables have their own issues!
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« Reply #8 on: December 26, 2017, 07:33:37 PM »
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load one side with a spring - and use a non stretch string (like kevlar) for movement on the other side.

it will have zero slop(play)

practically speaking - a little play will make no difference , unless you are flying at very high speeds


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« Reply #9 on: December 26, 2017, 08:41:41 PM »
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@saikat sir,
"I lean on old familiar ways..."
(With apologies to Simon and Garfunkel)
Regards
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« Reply #10 on: December 27, 2017, 05:08:39 PM »
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Yes i have thought about that too @saikat sir
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