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Newbies: Tips and Information Section of HF, specifically for Passing along info to newcomers to the hobby. Setup, tweaking, orientation practice, etc.

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Old 07-29-2021, 05:48 PM   #1 (permalink)
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Default 550kv vs 450kv electric motor efficiency

Hello all i hope this is the right place to ask this question if not please let me know. I am building an 700 class heli and and looking for info on a kv size motor, I know the norm is usually around 530kv for 12s and im not the most experienced in the electrics so my question is would an 450kv motor be more efficient with a higher pinion or than an 530 with a lower pinion i guess i just always thought that the lower the kv the higher the torque. Just looking for a little advise from some people who know more about it than me.

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Old 07-30-2021, 08:25 PM   #2 (permalink)
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Pick the motor you want based on headspeed you want at about 80% throttle output. That gives you proper overhead and efficiency.

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Old 07-31-2021, 03:12 AM   #3 (permalink)
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The most important thing is to look at the overall system. What Kv will be best depends on your battery cell count, target headspeed and available gear ratios. If you have a wide choice of gearing then best pick a gear in the middle of the range rather than having to go right to the limits of the available pinions.

All else being equal and assuming your heli has suitable gearing, there is a theoretical advantage for higher Kv motors because they can operate through a greater reduction ratio, thus they have lower torque loading and lower magnetic flux density, which gives higher efficiency. It's a complex subject with many variables.
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