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HelicopterMain Discussion › Damaged a servo with 7.8v ! Dumb me !
03-15-2015 11:20 PM  3 years agoPost 1
Cobra 46

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Cambridge il usa

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This isn't the way I wanted to start my flying season !!
So I put a kosmik in my LHS Heli and set the voltage to 7.8 v to go with my 2 s lipo and thought I had it all covered !! Rec good to 9.6 v ,, tags 01 good to 8.4 v ,, Until I went to fly it today (1.2 hr drive ) and the pitch servo did nothing !!! Crap !! 😞 now what ???? bad wire nope, plugged in wrong ?? Nope ! Radio prob ?? Nope !! Dumb ass problem ??? DING DING DING DING YEP!! I didn't look at what the max servo voltage !
Spectrum h6040 servos good for 6 volts ! Crap!
Lessen learned now I need 4 servos !

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03-16-2015 01:40 AM  3 years agoPost 2
Fauropitotto

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Tampa, FL

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Ouch!

Lesson learned I bet.

Almost did the same thing with an earlier heli, but after building from an airframe I had to spend a considerable amount of time looking at servo specs, power bus specs, etc. Picked components from the ground up for the HV setup.

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03-16-2015 06:50 AM  3 years agoPost 3
EEngineer

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TX

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Dude....that sux...

Keep a log of modifications....and always update the maintainence log....

You have a lotta money in this, etc.

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03-16-2015 09:49 AM  3 years agoPost 4
Cobra 46

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Cambridge il usa

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Good idea on the log !! When every Heli is equipped differently it does get hard to remember all the details !!! ( has nothing to do with age!!! )

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03-16-2015 06:56 PM  3 years agoPost 5
kingmeow

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The Garden State, US

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Been there done that but on a plank with less costly servos. After that lesson, now I check battery input and servos on any new projects or repairs!

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03-16-2015 07:27 PM  3 years agoPost 6
Rob43

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Midland, MI USA

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I don't understand...

"...kosmik in my LHS Heli and set the voltage to 7.8 v to go with my 2s lipo...".

Were you attempting to operate the Kosmik BEC and a 2S Lipo? Using a 2S lipo as a buffer pack?

Rob

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03-16-2015 10:49 PM  3 years agoPost 7
Cobra 46

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Cambridge il usa

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Rob
Yes that is correct
And the spectrum servos are 6v max
I had the kos set to 7.8 v or 8 v. I would have to check

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03-18-2015 05:36 AM  3 years agoPost 8
wc_wickedclown (RIP)

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long beach calif

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i use the SPEKTRUM H6160 HV DIGITAL HIGH SPEED 8.4v

im running them at 7.4 so far so good 36 bucks

Insha Allah made in america

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03-19-2015 12:16 PM  3 years agoPost 9
Cobra 46

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Cambridge il usa

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Thanks wick. I'll look them up !! Wow. 39 bucks each !! ! That doesn't hurt anything like $ 99.99 each.

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03-19-2015 03:00 PM  3 years agoPost 10
jharkin

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Holliston, MA - USA

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How long did you have that servo hooked up before it died?

7.8 is out of spec, but its not that far out of spec and I would be surprised if you burned it up with just a short exposure. "6 volt" servos are rated for 5 cell operation, and in the old days 5 cell NiCD and NIMH would start as high as 7.5v hot off a fresh charge. We used to ,and still do, run "6v" servos at these voltages all the time with no real damage.

Ive even got some "4 cell only" servos that Im overdriving to about 6.5v in non-critical plank applications. They dont last as long but they work.

So again Id be surprised if you fried the servo instantly with just a brief exposure to 7.8v.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

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03-19-2015 04:04 PM  3 years agoPost 11
wc_wickedclown (RIP)

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long beach calif

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Cobra 46
Thanks wick. I'll look them up !! Wow. 39 bucks each !!
ebay 36 bucks free shipping
glad to help brother

Insha Allah made in america

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03-19-2015 08:33 PM  3 years agoPost 12
Cobra 46

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Cambridge il usa

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Jharkin
They where in there during setup I flew it twice and I went to fly it again and one servo was dead on my preflight and another burnt up while trying to figure out what was going on !!

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03-22-2015 12:59 PM  3 years agoPost 13
jharkin

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Holliston, MA - USA

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ouch... sorry to hear about it, guess those servo are sensitive.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

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03-22-2015 03:08 PM  3 years agoPost 14
Cobra 46

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Cambridge il usa

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Now there junk !! Lol. Got the savox in waiting for time to fly !

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03-23-2015 08:43 AM  3 years agoPost 15
HeliHov

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NorthEast USA

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That happens sometimes and sorry about that. It`s one of those things where it leaves you kind of pissed off at yourself. I give you credit for posting this and admitting what you did. I`m sure you wont do it again!. Some of the servos not rated for HV like the old Align ds610`s could handle the higher voltage. But some cant. I think it should be an industry standard these days for all servos to be able to handle HV. Our power systems are requiring more and more juice these days. Thanks for the heads up WC on the servos. Sounds like a great deal.

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HelicopterMain Discussion › Damaged a servo with 7.8v ! Dumb me !
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