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When I run my A2212/13T 1000Kv brushless motor by itself with 11.1 or 7.4 volts(i am using 2 lipo 3.7volts 900mah and a li-ion 3.7v 900mah in series that I connected with alligator clips) it runs fine. But when I add the propeller(10x4.5) it came with, it will run for a second then stop and make a series of beeps, which looks like it's trying to reboot itself. I am using a 30A ESC. Does anyone know how to solve this problem? Thanks.

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  • $\begingroup$ You say this is a 10x4.5x2 propeller? Or is it a tri-blade? $\endgroup$
    – ifconfig
    Jan 14 at 5:16
  • $\begingroup$ no, it is just a normal blade 10x4.5, search up 10x4.5 propeller and the picture of what I'm talking about should come up. $\endgroup$
    – cool bean
    Jan 14 at 5:26

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I think you're most likely running into current limits with your battery setup. The motor you linked to is spec'd for even more aggressive propellers (e.g. 10x5 and 10x6), so it's likely not the problem.

It's hard to say for sure without knowing more about the specific battery cells you're using to construct your "franken-pack" (I suspect this is a follow-up to your question about series-connected battery cells), but it's likely that your 900 mAh cells aren't rated for the continuous discharge required to spin a larger 10x4.5 propeller.

The failure mode you describe sounds like this is happening:

  1. Initial propeller rotation from rest is supported by the burst discharge capabilities of the battery cells
    • This comes at the cost of abnormally high battery terminal voltage sag
  2. The ESC freaks out because the battery voltage it sees has dramatically decreased and isn't recovering
    • ESC responds by cutting power to the motor and sounding a fault code
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  • $\begingroup$ what you have answered sounds about right, but to solve this problem what battery do you suggest I should buy $\endgroup$
    – cool bean
    Jan 14 at 5:53
  • $\begingroup$ You should look into higher discharge rate 3S LiPo battery packs, e.g. 30C or higher. $\endgroup$
    – ifconfig
    Jan 14 at 7:50

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