|Dec 30, 2005, 12:13 PM|
Amps vs volts vs performance
I've been doing some testing with an Esskay 400xt with an APC 9x4.7 prop and 3 cell lipo packs.
1st pack is 900 ma 3 cell rated 15c. Starting and running for aprox. 20 seconds the voltage drops off to around 9 volts.
2nd pack is 800 ma 3 cell rated 20c. Same as above but voltage stays over 10 for quite a while.
Motor is warm-hot after these tests. Amp draw is between 9 and 10 amps. 900ma pack is warmer than 800 pack after this test.
I don't fly full throttle, don't need to. I am wondering from the above results, it seems that the smaller ma pack is better able to handle the amp draw from the motor.
Am I assuming correctly? If so would a pack that can sustain a higher amp draw be a better choice (disregarding weight)?
|Dec 30, 2005, 01:39 PM|
Joined Jul 2005
|Dec 30, 2005, 06:37 PM|
Your pack is rated @15C continuous or burst? If not stated, you would normally assume it was cont, then the pack should be able to sustain a 13.5A discharge rate. Either the pack is over rated, or you are actually pulling more amps than you think.
|Dec 31, 2005, 06:01 AM|
I've run the test several times with the same results. Used a scale for thrust, a Medusa watt meter and a tachometer for rpm. I agree that the 900 pack must be overrated. I ran the test again and only used half throttle. Held about 5 amps. Both battery packs were warm but the 900 pack was a bit warmer than the 800. Wish I had a thermometer to measure temp but how many tools is one supposed to own?
I thought it was the one with the most toys... not the most tools.
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