Thread: Motor selection
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Old 09-17-2016, 01:34 PM
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aymodeler
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Take a look at Cobra motors sold by Innov8tive Designs. They publish performance charts for different combinations of propellers and batteries.

A C-3520/12 might be close to what you need: http://innov8tivedesigns.com/parts/brushless-motors/cobra-c-3520-12-brushless-motor-kv-820

According to the propeller chart with a 4S battery you will get 576 watts at 39 amps with a 12x6 prop. You should size for at least 100 watts per pound, so depending on your final airframe weight, you may want to look for a combo that will get you bit more power. However, if you need more than about 700 watts you might find that you need to go up to 5S or larger battery as most motors in this size range are limited to around 50 amps for continuous operation (for a 4S battery - 50 amps x 14.8v = 740 watts).

Al
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