One of the first rules we're taught in drone (quad copter/multi-rotor) flying, especially racers, is to remove your props whenever you work on your drone.
This applies to whenever you have your drone on your workbench and doing any kind of maintenance or repairs on them.
However, one scenario not often discussed is disarming your machine BEFORE YOU PICK IT UP in the field.
I found this out the hard way.
This past Sunday I decided to try my first FPV flight in my backyard. It was a sunny day, nice and warm, but the wind was up over 10mph. I've flown in 10mph+ winds before, so not a big deal right? So there's no confusion, the wind wasn't the problem.
My exhuberance to fly was though.
I really wanted to be in the air with my face box over my head experiencing the thril of FPV. That lasted all of about 10 seconds.
To get an idea of what I'm saying here, check out my flight video.
A major lesson learned by me.
The caviat to rule #1: DISARM YOUR QUAD before picking it up!!!