RPM to flying B2212_920

Hello All,
I make the first drone and bought the motor B2212_920 and frame F450. I have my own motor controller and I can adjust the RPM. I will use 4S LiPo. Today, for the first time, I switched on the motors and dispersed up to 7,000 RPM with the propeller. After 2 minutes, the motor was very hot. It was impossible to touch. The current was 8A rms. With what RPM flying the drone ? On the Internet they write that the motor B2212 can operate 15-25A and peak current 30A. I hardly believe in it. The motor will overheat.

Thank you

Andrew.

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