I purchased one set of Zeagoo 9450 props on Amazon.
They fail the most important spec ---> attachment to the Phantom 3.
One pair only threads on a little more than one full turn. The other pair threads on 5 full turns (all my genuine DJI props thread on at least 6 full turns).
Of the 4 props delivered, two are CW and two are CCW. The red stripe is painted on the ends of the top sides only. Overall finish is good.
Seeing other concerns about weight and flex I still checked these out:
Prop masses are: 11.49, 11.51, 11.42, 11.59 grams. Total of 46.01
For reference my two sets of genuine DJI 9450 props are 12.3 +/-0.2g
I also checked prop for flexing since this seemed to be a complaint/concern for other non-DJI props.
I used a rig that applied 25, 435 & 1050 grams and then checked deflection at the hub. See the photo for the rig. The weights are 205g each. The blades rest mid-point on each support (127mm spacing for 240mm (9.4") prop length). 25g is the mass of my prop balancing rod and an old prop acting as a nut). This small weight steadied the prop and gave my reference point. 435g is about 1/3th of the mass of the Phantom 3. 1050g is my calculation of force at full upward thrust. Deflection was measured using a precision calipers from the prop hub based on the 25g position.
Figure 1: Prop Flex Rig with 435g weight.
Prop Flex Results:
Prop# 1 2 3 4
435g 1.3mm 1.3mm 1.2mm 1.4mm
1050g 3.0mm 3.1mm 3.0mm 3.2mm
For reference, Genuine DJI 9450 props deflect 1.1mm & 3.1mm +/-0.1 under the same conditions.
Conclusion:
These props weight slightly less than genuine DJI and flex slightly more.
Anyone is welcome to comment on this method with improvements or faults.