brush type motor 1 of 4 slow WL V959

Flippy

Member
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Not sure if your quad has bearings either end of the prop shafts like my udi u818a. But when one of my bearings gave up the quad was very hard to fly. Spin each prop by hand and that will let you know if one or more bearings are buggered. They are very small 7.5mm outer diameter from memory.
I am only new to quads so take this with a grain of salt but I hope it helps.
 
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