Piranha Propellers Durability Piranha Propellers Assembly   Stress testing demonstrating the strength and durability of Piranha Propellers in comparison to aluminum propellers. A demonstration of the assembly of the Piranha Propeller and a demonstration of a blade replacement of a Piranha Propeller.     Piranha Propellers Submerged Object Stike Comparing the damage caused by an submerged object on a aluminum propeller compared to a Piranha Propeller. Demonstration of the how easy and simple it is to replace the damaged blade on a Piranha Propeller.