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Motor Spin up
701 3 2016-6-2
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solsystem7
Second Officer
Flight distance : 6325712 ft
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United States
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Does anyone know why the motors on the P4 surge a few times after arming them? The props are not self tightening like the P3. It seems like it would create additional stress on the motors and prop assembly.
2016-6-2
Use props
scarper
Second Officer
Flight distance : 59272 ft
Australia
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I would say its a power on self test. Pretty much like a PC when it powers on it tests everything before allowing the machine to Boot up and work.
2016-6-2
Use props
solsystem7
Second Officer
Flight distance : 6325712 ft
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United States
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scarper Posted at 2016-6-2 23:33
I would say its a power on self test. Pretty much like a PC when it powers on it tests everything be ...

Thanks, you could be right
2016-6-3
Use props
david.p.mann
First Officer
Flight distance : 17759432 ft
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United States
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I believe it is a way for the P4 flight logic board to check for the presence of properly attached props on all four motors by looking for resistance to increased motor speed. If you arm your P4 with no props attached, for example, you will typically get a warning message while the P4 is on the ground with motors running.  I can't remember the exact message - something about rotors. This testing is a good thing. For example, if one or more props were not securely mounted (due to incomplete or improper quick mount procedure), then a prop could fly off shortly after takeoff resulting in a crash.
2016-6-3
Use props
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