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Old 11-12-2003, 04:56 AM   #1
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Lithium poly cut off voltage with GWS recievers

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How does one get around the danger of going below the recommended lithium battery cutoff voltage with a GWS receiver?
I am using motocalc to estimate the maximum run time with a given battery motor combination and then I run the plane to 2/3s the maximum. My concern is not so much for the battery as it is for a motor running for 20 to 30 minutes without a cool down. I never had that problem with a Nicad.
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Old 11-12-2003, 09:47 AM   #2
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The RX has nothing to do with it. Some ESC's have an adjustable cut off voltage so you don't over discharge a Lipoly. What ESC , battery and motor are you using ?
Marc Thomson
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Old 11-12-2003, 09:16 PM   #3
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I use a GWS 300 D 6.6 gear ratio with a 10A ESC and a 1500mah 2s lithium poly.
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Old 11-25-2003, 07:04 AM   #4
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lipoly cutoff

you don't need to worry about motor burn out with two cells..if you move up to 3 cells you will start eating up motors...
If your staying in electric I would suggest that you consider the Castle Creations pixie 20 for brushed motors or the PHX25 for brushless..
they will allow you to set the proper voltage cutoff for your selected lipoly pack..2 cells 3 cells etc.. 3 volts per cell is a safe cutoff per cell...also make sure you have the high discharge lipoly from either etec kokam or thunderpower...these will handle an 8c discharge and the ThunderPower will deliver 16-21 amps...the main problem with using GWS ESC is that some people will estimate the power fade but it is difficult to do with the newer lipoly cells that deliver is however much easier to (feel) the power fade with an IPS motor drawing 2-3 amps.... EPS 300 D gearing with a 12/6 prop will draw 8-9 amps at full throttle..and up to 11 amps off a fresh NiMh 9.6 v pack....the lipoly pack will have a much slower dip as it will hold voltage under load for a much longer period then the NiMh...
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