The 2 quick revs on startup

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Do you think that is to make sure the self-tightening props are secure?
 
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Nope....i don't. More of a engine test or just a fancy startup....nothing to do with props imo

Personally it cracks me up a bit because in my head the P3 is just showing off and goosing the throttle a bit before the drag race.
 
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Well maybe I'll test with loose props and see if it makes a difference. In my experience it makes people take a step back.....Warning!
 
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WAG

Yes, to tighten the props. Active braking would require tight proper propellers to avoid spinning one off. I always make sure they're snugged by hand.
 

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