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Old Jul 13, 2012, 11:48 PM
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Question

Hacker A80-8 Motor


Hello,

Looking for a bit of advise, after reviewing many many options for my Hempel Yak55 (50cc) I am leaning towards the Hacker A80-8 Motor, but am also considering the Q80 series. Now I am not looking for power but happened to notice the effiency of the motors differed by 3%. 89% for the A80-8 and 91% for the Q80. So looking more towards flight time on a 12s 6,000mah battery which will provide more time and what is the calculation for figuring that out if I might ask.

Thank you for your time
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Old Jul 16, 2012, 10:26 AM
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Titan,
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.
Old Jul 17, 2012, 11:32 AM
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Thank you for that, don't know why I didn't just think of it that way! I appreciate the post FL!!


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