They are pretty good, probably on par with a 6x3 prop, got them just to try out but 3 blades are inherently inneficient vs. the equivalent 2 blade prop. Also they break if you look at them 
I have a bunch of gemfans 5x45 ordered to try out.
I also got a turnigy thrust test stand for which I've been meaning to benchmark these props for ages on!

I have a bunch of gemfans 5x45 ordered to try out.
I also got a turnigy thrust test stand for which I've been meaning to benchmark these props for ages on!
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