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Pushrod movement question

Old 03-28-2007, 12:48 AM
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Alex7403
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Default Pushrod movement question

Hello,

im breaking my head with something here

How to avoid stress on the servo?

In the pictures there is a changing gap of the right red and the hole in the strap, it’s the circular movement of the servo arm. (it wants to move in that direction)

If I lock that gap with glue, it will make the movement of the pushrod harder on the servo.

one way to solve it is to keep the metal bars that go into the pushrod short, without reach the red sleeve?

or how long should the metal bars be, relative to the red sleeves?


the plane is sig mid star 40 kit

ideas? Pictures?

Thanks

Alex
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Old 03-28-2007, 01:22 AM
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Default RE: Pushrod movement question

Can you rotate that servo 180º so you have a longer piece between the servo and tube to flex?

I remedied this on my Sig Somethin' Extra using small pieces of cable between the clevis and the CF control rod.



They flex but won't compromise control.

somegeek
Old 03-28-2007, 02:28 AM
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Default RE: Pushrod movement question

Thanks

I was building it as a trike so the long arm will move the front wheel, but i see a tail drager is inevitable, oh well

with what do you glue the cable in the pushrod?

thanks again

Alex

Old 03-28-2007, 12:38 PM
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Default RE: Pushrod movement question

I used NHP Flash Black. It's a rubberized, somewhat flexible CA glue.



somegeek
Old 03-28-2007, 01:03 PM
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Default RE: Pushrod movement question

There is an easy fix for this. Give me a few minutes and I'll draw up a picture for you.
Old 03-28-2007, 01:15 PM
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Default RE: Pushrod movement question

Ok, glue a block of scrap balsa or plywood about 2 or 3" long to the back of the bulkhead and secure the outer pushrod to the aft end of it.

This will allow some flex at the servo end while holding the outer pushrod in place.
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Old 03-28-2007, 02:14 PM
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Default RE: Pushrod movement question

Thanks Mike,

looks like a good simple idea, ill do it today.

p.s. great videos about covering, thats my next step.

Alex
Old 03-28-2007, 02:16 PM
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Default RE: Pushrod movement question

Good luck!

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