These are the best motors I've used on a quadcopter and tricopter. They are extremely fast with 8x4 propellers. I haven't had any problems with them at all. Other than one bent shaft (my fault) on one motor I replaced, I still have my original motors after 12 months on both my tricopter and quadcopter. I highly recommend these motors. If you don't know exactly what you want on your quad/tri, I'd recommend these 1300kv with 8x4 props over slower KV motors with larger propellers (10x5, 11x5, etc). The higher kv make these more awesome and responsive in my opinion.

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