Crash = servo check - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-07-2003, 07:08 AM   #1
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Crash = servo check

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Who physically checks each servo gear after a crash? I just finished setting up wife's new trainer. The impact last year destroyed the gears in the throttle servo. Couldn't believe it. I normally just turn them and if they sound funny I check them. Well the throttle was a no brainer.

The servo for the elevator sounded and felt fine, but decided to check anyhow (already lost a brand new plane to a elevator servo with missing teeth). Well, the gear had 2 teeth missing. Sounded fine, but really glad I checked it. I think this will become a standard practice. (Not that I will have to - mind you.)
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Old 04-07-2003, 07:29 AM   #2
Kevin McGrath
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You dont have to crash to strip servo gears.Bumping a control surface while transporting or moving the model will do it.Also control surface flutter in extreme cases.
Adding a gear check to regular maintainance is a good way to lengthen the life of any model.....
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Old 04-07-2003, 07:43 AM   #3
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Yeah Scott knows about flutter

I always take the top of the servo after a crash (rough combat year ) and check the gears; just in case. If a plane is flown a lot then the servos get checked at the bi-annual cycling time.

I should probably check more often but haven't had one fail .... yet

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Old 04-07-2003, 08:08 AM   #4
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I would check after every crash but I don't think that would be checking often enough. :P

I don't always visually check the servos (some are quite buried in my planes) but use a more manual method. I cycle the servo through a full range of movement while "loading" the servo slightly by holding (gently) the surface it controls. Check for those oz/inches, sometimes it's not a broken gear but a dead spot on the motor or a bad pot (more common). To check for a bad pot I look for good repeatable centre positioning and quiet zones at several positions. I also vibration test my servos and Rx....

I also understand many don't send their equipment in for service regularly. I send my TX's in for checking/tuning at least every other year....

HTH, Jim.
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Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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