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Matt Kirsch -> RE: Li po and amprage (12/4/2003 4:24 PM)
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The important thing is not the rating of the motor, but how many Amps you actually draw at full throttle. Just because the motor is rated for 18 Amps does not necessarily mean that you will be drawing 18 Amps on the airplane. You could be drawing more, or you could be drawing less. It depends on the propeller you use and how many cells you use.
Much of the decision making is "philosophical:"
Do you need maximum power from the motor? Maybe you only need to prop it to draw 12 Amps. That would pretty much end the discussion right there: 3S1P is plenty.
Are you just going to burn holes in the sky at full throttle, or do you plan on only using full throttle for short bursts? If you want to burn holes, you probably want to size the battery for 18 Amps continuous, which means a 3S2P (24 Amps). If you plan on spending most of the time cruising around at lower throttle settings, and only need full power for quick vertical climbs and to get out of "oh s***" situations, you can get away with 3S1P.
Unfortunately, you're the only one that can answer those kinds of questions.
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