Thread: Discussion MJX-F45 Single Rotor FP
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Old Jan 20, 2013, 03:54 AM
tiggertoo1962 is offline
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Scotsman in Germany
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Germany, BY, Schwabach
Joined Oct 2012
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twitchy servos

Hi guys

Big Bird II arrived yesterday just before I had to go to work. Only had enough time to find out that the charger doesn't work (email sent straight away) and that the heli made a "tsst, tsst, tsst" sound when running on the bench. Thought it might have been flybar strikes caused by slop in the blades, so I shimmed them without any noticable improvement. My thoughts then turned to unbalanced blades maybe having the same effect (strikes) but since I don't yet have fine scales I couldn't check it. Made a vid for analysis below. As can be seen, the flybar looks to be balanced and not hitting the blades.

"tsst, tsst, tsst" noise (0 min 40 sec)

Had a closer look this morning and discovered that the aile and elev servos have their own minds, and start twitching when the battery is plugged in. Happens even before binding with the TX. The noise I heard is obviously the servos twitching when the motor is running.

twitchy servos (0 min 17 sec)

Is there an easy fix for this or do I need to send the heli back as a duffer?

Sorry about the vid quality... took it on my #808 so couldn't see what I was filming

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