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Old 02-13-2009, 04:24 PM   #1
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Questions?? Can 6V servo's be used at 7.4V

Can 6V servo's be used in a car with a 7.4V receiver pack?

I know some of the Rallycross guys use this method to avoid having to use a regulator when using a lipo receiver pack.
I was wondering whether my GT10 would be OK, it has a Futaba 9650 servo. I know the Spektrum receivers can take up to 9V.

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Old 02-13-2009, 05:52 PM   #2
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Keep in mind if you are using lipo it's not 7.4v, a fully charged 2S lipo is 8.4v. In the RC heli world lots of people are using 6v servos running on straight 2S lipos. However it's not guranteed that every servo will operate at this voltage and more importantly how shortened the life span of the servo is.

In other words, your mileage may vary, and don't get mad if the servo burns up early in life.
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Old 02-13-2009, 06:10 PM   #3
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Originally Posted by Anthony.L View Post
Keep in mind if you are using lipo it's not 7.4v, a fully charged 2S lipo is 8.4v.
True, but all battery packs are above their 'nominal' voltage when fully charged, my 9.6V transmitter battery is 11.5V once charged.
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Old 02-13-2009, 06:17 PM   #4
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Quote:
Originally Posted by Skiddins View Post
True, but all battery packs are above their 'nominal' voltage when fully charged, my 9.6V transmitter battery is 11.5V once charged.
yeah, but 8.4 volts is greater than a 6.0 volt speed control output. You will still get 6 volts out of the speedo regardless of input voltage.

Also, a five cell pack will peak at around 7.5 volts, (as in receiver pack), which is also a bit less than 8.4 volts, plus with a nimh that will drop down drastically the moment it is pulled from the charger.
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Old 02-13-2009, 06:52 PM   #5
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If I were you i wouldn't do this...

I've seen people burn up servo's in less then 2 mins running a straight lipo pack with no regulator.
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Old 02-14-2009, 04:38 PM   #6
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you can do it using one of these..


http://www.hellevaheli.com/index.asp...ROD&ProdID=825
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