GemFan Propellers have set the gold standard in the small class Multirotor community. Known for their durability, great balancing and superb hub centering and expendable price. They come packaged as a set of 2, with one CW rotation and one CCW rotation. There is a wide range of color options that can be mixed and matched to help with multirotor orientation. This is the perfect upgrade for any small multirotor.
Hub: 5mm (adapters included for 4mm,3.17mm and 3mm)
Material: Carbon reinforced Nylon
1 x CW rotation
1 x CCW rotation
Unit Weight (g):
cheap but great performanceThese props are very stiff and well shaped.
[WARNING] However, the structural integrity of these props are nearly impossible to verify after a crash. I was tuning PIDs for a 250 quad (using 2150kV MS Elite 'Mini Monster' motors and a 4S battery) and had a few rough landings. After the first prop broke, I carefully checked each prop after each flight, as they were snapping at the root.
I finally had the PID's tuned in to prevent oscillation at ~50pcnt throttle, so I tried gunning the throttle to see how it handled at ~80pcnt throttle.
In a split-second, 7 out of the 8 total blades on my quadcopter exploded / ripped apart mid-air and the quad fell to the ground. Some blades flew more than 10 meters, one blade had flown inwards and ripped ~4cm of heatshrink off the side of my video TX and one propeller was found in at least 3 pieces, split down the length of the blade into slivers.
While I cannot recommend these props for a quad using the same high-power motors and 4S battery setup, I do believe these props operate fine with a more moderate / 3S setup.
Here is a link to a video of the incident: https://www.youtube.com/watch?v=8Ut29iIa2xwtoste. davvero toste