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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 09-29-2007, 07:31 PM   #1
iwasaseabee
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Default Bad HS-65MG

I have had 3 Hs65 mg servos go bad in the same rh aileron position on my v2. I cannot find any mechanical binding or interferance on the heli. The first went bad after a month of flying, I sent it back and put a new one in. I received the old one back and the new one went bad!? I put the repaired one in and in only 5 flights it has failed again. I am using a dx 7 with 6100 receiver, should I try replacing my receiver? Could my radio settings be causing some kind of interaction? What should I look for? Thanks!
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Old 09-29-2007, 07:41 PM   #2
Rick Rotorhead
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Aw man! The exact same thing happened to me! 3 servos, all hs65mg's all in the aileron slot on the right side of the frame (check the threads you'll find me be-moaning about it at length). In the end I decided it was one of two possible causes 1) tight fitting servo case in the frame slot - this can slightly deform the servo gearbox at cause failure due to internal binding 2) A Rx fault putting servo power through the signal wire and frying the servo's amp/electronics.

I cured it by filing out the frame slot (though it really wasn't tight) and changing the Rx to a different make. My Rx was originally the Futaba 146ip and I put a Shultze 8.35W in there instead. Now, my servos are fine, but I've got a persistent glitch problem instead!!!

Check the obvious first - free swash plate movement and an easy fit of the servo case in the frame.......
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450SE Silver - Power: Neu1107-2Y + 10t pinion ESC: Jazz 40-6-18 Governed. - Batts: 4s, FP 2100 Evolites. Pitch +/- 12* (TC63 PC 0,25,50,75,100), cyclic 6* HS2900
HS65Mg x3 + GY401 + S9650 tail.... Rx: AR6200 - Tx: FF9Super(T9CP) +Spektrum Module
Crash count = 13 for 179. Trex time aloft = 22:42
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Old 09-30-2007, 07:17 AM   #3
iwasaseabee
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Thanks rick for the advice! I went and checked the servo opening and it fits perfect,I went and filed the edges a little more anyway. as far as the bird I cant find any thing tight or binding. I read your previous posts and it sounds the same. I'm going to try a new receiver and see what happens. Thanks!
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Old 09-30-2007, 01:30 PM   #4
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Are you really really sure that nothing is binding??? I just kill my ESC because I replaced attached part and the screw (circled in red) was 1.5 turns too tight. The servos could move the swash with ease (or so I'd thought), but when I move it by hand it took a whole lot of effort. Similar syptoms, all three servos buzzing, replaced gear sets still buzzed, replaced with new servo still buzzed. Only discovered problem after much head scratching, but ESC got damaged as a result of BEC being overloaded. The thing would fly but lossed HS within 1 min of take off.

Try powering your Rx by a battery instead of the ESC to eliminate an ESC fault.

I was also puzzled by why my AR6100 was working fine while this was all happening. Can only conclude that it handles low voltage pretty well and draws very very little current.
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Old 10-01-2007, 07:09 PM   #5
Rick Rotorhead
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Yeah, all the links should just be able to fall under their own weight when disconnected at one end!
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450SE Silver - Power: Neu1107-2Y + 10t pinion ESC: Jazz 40-6-18 Governed. - Batts: 4s, FP 2100 Evolites. Pitch +/- 12* (TC63 PC 0,25,50,75,100), cyclic 6* HS2900
HS65Mg x3 + GY401 + S9650 tail.... Rx: AR6200 - Tx: FF9Super(T9CP) +Spektrum Module
Crash count = 13 for 179. Trex time aloft = 22:42
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Old 10-12-2007, 08:52 PM   #6
iwasaseabee
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Yeah all on the heli is perfect! received servo back from Hi tec repair order said bad amplifier. So I replaced the receiver with another AR6100 No problems since. I will say hi tec has an excellant turn around on warranty repairs. I'll try sending my receiver in for warranty next.
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Old 10-12-2007, 10:31 PM   #7
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Vibration can kill a servo! Is your setup running smooth?
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Old 10-13-2007, 06:44 AM   #8
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Don't fret,I'm in the burnout club also! I had three, yes 3 65mg servos burnout at the same time. I bought 3 of the 65HBs and swapped the MG gears and servo tops w/bearings to the HBs, all's well so far. That was 8 months ago.
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