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450 Class Electric Helicopters 450 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 06-09-2013, 10:35 AM   #1 (permalink)
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Default DS76T GETTING HOT WITH TAROT ZYX UNDER NO LOAD?

I know the ds76t servo isnt the greatest but for the $ & after breaking my 9257clone in a crash i figured i give it a shot. It is a digital servo that shouldnt be ran at a high mhz so i have my zyx set to analog 71mhz. When i was setting up the tail, getting everything at 90degrees without the pushrod connected to the pitch lever the servo was buzzing a little. I touched it & it was warm, i connected the pushrod & set the limits for no binding. After that the servo was hot, definetly hotter than it should be & its runnning on analog. There is no binding anywhere, last night i spent an hour checking the mechanics because iknow the servo doesnt have a lot of torque. I even polished the tail rotor shaft with my dremel & polishing compound & have absolutely 0 resistance between the slider & tr shaft. My tail deadband is set to 14. Do i need to change gyro deadband? Or try running at 251mhz? But i dont want to fry the servo before i have a chance to fly it.
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Old 06-09-2013, 01:27 PM   #2 (permalink)
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Im running a cc 10 amp bec at whatever the default voltage setting is. I think its 5.2v?? Pretty crappy if the ds76t is heating up from that voltage. I have ran a regular ds76 on the tail without any problems other than it being slow & weak
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Old 06-10-2013, 01:26 AM   #3 (permalink)
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Quote:
Originally Posted by brettskywalker48 View Post
I even polished the tail rotor shaft with my dremel & polishing compound & have absolutely 0 resistance between the slider & tr shaft.
I've never heard of anyone doing that... is that even a good idea? I normally use silicone and teflon lubricant for the tail slider shaft. It works well for reducing friction.

The thing with these cheaper servos is that a lot of the frequency ratings are not listed anywhere and so you're better of using a name brand servo and FBL controller combo. If you spend the extra money, you won't regret it and you won't need to spend all of your time guessing what frequency to run it at etc. So much less headache.
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Old 06-10-2013, 12:57 PM   #4 (permalink)
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I yanked the ds76t out, put a gotek 9257 in. I have a hitec 5084 with a broken case, which im going to order a replacement case for tonight. Yeah it safe to polish any of your shafts as long as you dont remove any material from them. If u find some rough spots using the proper polishing compound will smooth them out. You can polish stainless to a mirror like finish, then u will know there arent any burrs or nicks present in the metal
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