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Old Jan 20, 2013, 06:05 PM
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Question
Do good Hitec HS-82mg servos sound like this?

Hi! I put these Hitec HS-82mg servos on my E-flite Pitts Model 12 and the video shows what they sound like? Is this normal? Thanks for all advice!

Servo Chatter - R/C aircraft servos (0 min 16 sec)
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Old Jan 21, 2013, 03:17 AM
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Difficult to tell because I can make them more noisy by turning up the volume on the video

Seriously, mine sometimes sound a bit like that, but the buzzing indicates that they're encountering some resistance. How stiff is that control surface with the servo linkage disconnected from it?
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Old Jan 21, 2013, 05:42 AM
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It's pretty stiff. I'll disconnect and see if they are still that noisy.
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Old Jan 21, 2013, 05:57 AM
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You need to get it as free as you can before you reattach the servo. It may be a case of simply flexing it back and forth a few times to free up the hinges, otherwise you'll have to look for where it's fouling.
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Old Jan 21, 2013, 06:01 AM
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Thanks. I had worked the ailerons a lot to make it loose as possible. I will try out the servos alone to see if that's doing the noise, though.
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Old Jan 21, 2013, 07:10 AM
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The 82's are lousy servos. For good performancs get 85's. And as mentioned check surface movement, good luck.
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Old Jan 21, 2013, 01:36 PM
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Not bought any Hitech servos in over 12 years (too pricey for what is delivered )
But it does sound like that servo is being overdriven
ie: running out of linkage travel before the servo does.
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Old Jan 21, 2013, 04:20 PM
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Linkage is good, plenty of travel. They should have ratings on these servos for noise potential. So the 85s work better? Bare-- What servos do you use?
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Old Jan 21, 2013, 07:48 PM
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With the linkage disconnected the ailerons should hang to almost full deflection. Sure sounds stiff to me.

Steve
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Old Jan 21, 2013, 08:05 PM
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They don't. They have to be pushed to to full deflection. I used the CA hinges and am regretting it. Know any way I can loosen them up?
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Last edited by Saxguy1000; Jan 22, 2013 at 06:21 AM.
Old Jan 21, 2013, 08:33 PM
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If done correctly, CA hinges work fine.
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Old Jan 22, 2013, 02:59 AM
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Quote:
Originally Posted by Saxguy1000 View Post
They don't. They have to be pushed to to full deflection. I used the CA hinges and am regretting it. Know anyway I can loosen them up?
You just have to flex the control surface back and forth by hand for a while.
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Old Jan 22, 2013, 06:24 AM
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These hinges have been really tough for some reason. I spent a while flexing them and it didn't make too much difference.
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Old Jan 22, 2013, 08:42 AM
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Your chatter starts from the first movement. Usually the chatter doesn't start until the servo meets some strong resistance.
If it was CA binding I would have expected extreme flexing to bust it loose. Are the ailerons too close to the wing and you have actual physical interference in the movement?

What was the result of the servo noise without the ailerons hooked up?
You are flexing the ailerons without the servos hooked up, right? (Had to ask)

Cut and replace if all else fails.
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Old Jan 22, 2013, 09:20 AM
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Here's a video of the same servos (this is right aileron) not connected to the ailerons:

HS-82 servos without load but noisy (0 min 27 sec)


The servos are on separate channels. You'll hear that they are about 50% as noisy as when hooked up in the video above (post #1).
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