By using threads that are the opposite to motor spin direction, the prop nuts automatically lock themselves down and won’t come loose. They call this ‘Self locking’, because on a quadcopter we have 2 motors spinning clockwise direction and the other two spinning counter clockwise. So why having 2 different shaft threads and making it so confusing? Prop nuts of different directions usually comes in different colour, such as black and silver for better user-friendliness.Īdvantages of having different CW and CCW threads Some motors only supply standard direction thread, which is CCW While some motors comes in pair of both directions, or you might be given a choice to choose which rotation you want when purchasing. And for CW motors, the prop nuts needs to be rotated anti-clockwise in order to fasten. New motors on the market does not have this distinction anymore, they all have the same thread direction, and you can disregard this article.īasically CW (clockwise) and CCW (counter clockwise) motors are still the same motors, apart from the prop shaft threads which have opposite direction. That means for a CCW motor, the prop nut is secured by turning clockwise. Update (Jan 2019): Motors used to have CW and CCW threaded shafts for mounting the props, but this is back in the days.
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