But what about the COMPROP’s durability?
CMP claims the COMPROP stands up well in general use. In a high-speed, solid impact, the COMPROP blades are designed to break off the hub, thus protecting the shafts and gears of the drive unit.
This is why the COMPROP doesn’t have a rubber hub center. CMP’s point is that it’s better to break an inexpensive prop than an expensive gearcase. In the same circumstances, aluminum blades would likely bend, absorbing some shock, while the rubber hub would (you hope) handle the rest. If bent, the aluminum prop could perhaps be repaired, not necessarily replaced. And unless it is severely damaged, the aluminum prop remains a propulsion device.