RE: 3 blade prop master screw 14x 7
The prop was brand new and from the material structrure you can see air bubbles - which was confirmed by the manufacturer after they examined the broken prop.
We thank god that the breakage did not occur while the plane was surrounded by people (on the ground).
If you woudl send me your e-mail, I can send you the picture of the broken prop where you can see the material structure.