I am looking to buy some cf props to use on my hexacopter, because right now i am using simple gemfan plastic props.
I want some 11x4,7 or 11x5 , but i dont want to spend a lot of money on them, but i also want them to be ok or good, they don't need to be perfect. I was seeing the rctimer ones but i saw people on the internet saying that they were crap
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As Scotty said, RCTimer has some ok CF props for cheap. This is 4 of each CW/CCW so enough for an Octo or enough for a Hex with a spare pair. http://www.rctimer.com/product_792.html
Graupner props are considered one of the best props out there but they are not CF, I think they are just carbon reinforced, but I'm not positive. They tend to run around 10-15USD per prop.
Helidirect sels some MayTech 11x5 CF: http://www.helidirect.com/maytech-11x5-multirotor-carbon-standard-r...
Helidirect also sells some GemFan 11x5 that are Graupner clones: http://www.helidirect.com/gemfan-carbon-fiber-11x5-props-graupner-s...
In general the cheaper the props the more time you have to spend balancing them if you want maximum performance, but most will fly out of the box with a decent controller.