5-Bladed Hartzell Propeller Approved For Piper M600 Again, the Sun 'n' Fun event was the place for major announcements, this time for Piper. The piston and turboprop aircraft manufacturer used the event to reveal that their new M600 was approved to use the 5-bladed Hartzell propeller. The advanced design of the carbon composite propeller blades allows for an unlimited life certification and makes them five to ten times stronger than similar wood core blades. The design features a stainless steel shank, nickel cobalt leading edge, and mesh erosion screen for FOD protection. Hartzell five-blade composite propeller is offered as a Piper factory option for 2017 on new M600 aircraft.