I saw syma X5 quadcopters use extra gear wheel to rotate propeller instead to directly link propeller to motor. I think this technique use for get more flight time. but i don't know exactly.please…Continue
"I still have the V929 ladybug quad from year 2012 converted to FPV drone that uses the gearing spur to spin the prop, still running well after many year till today without any problem with no sign of wear and tear. They can fly about 10~12…"