Very good prop, needs a little balancing, gives more RPM and power but less motor/prop-noice. Excellent !
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I bought five of them, used one so far. Perfect balance, and when I say perfect I really mean that, perfect blades balance, perfect hub balance. I just had to drill the hole a bit to fit my setup.
The paint in the front prop side is ok, on the back is a bit rough, maybe that affect a bit the penetration and general efficiency but I don't have any plastic equivalent prop to try.