Thread: Question Hacker A80-8 Motor
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Old Jul 16, 2012, 09:26 AM
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They are both very good choices, however the Q80-8M would be the best possible between these two. Since it is more efficient, it requires less input power for any given output (Prop) RPM. This means longer flight times, and less heat.

The calculation to express this is simply
motor input power x motor efficiency = motor output power

For Example:

5000 watts x 91% = 4550 watts
5000 watts x 89% = 4450 watts (100 watts less power to the prop)

To look at this another way, a given prop turning at a specific RPM will absorb a specific amount of power. A more efficient motor will require less input power to turn that prop at that specific RPM. This means longer flight times due to less draw from the batteries for the same performance.
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