World’s first 7-bladed Propeller for General Aviation is now supplemental type certified by FAA STC SA02742NY on the Pilatus PC-12 powered by a Pratt & Whitney P&WC PT6A-67B or PT6A-67P propeller turbine.
The Silent 7 defines a new level of comfort, performance, so far never experienced on any turboprop aircraft before. When MT Propeller started developing the world’s first seven-bladed propeller for General Aviation in 2016, the company had the same vision when in 1999 MT Propeller came up with the first five-bladed propeller for turbo prop aircraft. The five-bladed propeller became an industrial standard with more than 2500 propellers sold for various kinds of turbo prop aircraft. The seven-bladed propeller is pushing the new limits for certain applications to go beyond the achievement of the five-bladed propellers. The Silent 7 is already supplemental type certified on the PC12 by EASA STC 10014953 R3.
MT-Propeller Vice President Martin Albrecht says that the installation of the seven-bladed MT-Propeller on the propeller turbine driven aircraft PC-12 features the following advantages:
• No engine modifications necessary
• Certified ground roll distance reduced by approximately 10%; AFMS amended • Certified take-off distance over 50-foot obstacle reduced by approximately 15%; AFMS amended
• Climb performance improved
• Aircraft noise level is about 4 dB(A) less than with the original metal propeller • Cabin noise is reduced by six to seven dB(A) depending on location
• Comply with the strict German noise regulations 2010 – “Landeplatz Lärmschutz Verordnung” for unrestricted airport operations in Germany and other European Countries.
Due to the smaller diameter the seven-bladed MT-Propeller for the Pilatus PC-12 has more ground clearance for less blade tip erosion from foreign objects. The MT-Propeller natural composite blades provide significant inside and outside noise reduction. They have no life limitation and are repairable in case of an FOD. The propeller also provides best vibration damping characteristics for almost vibration free propeller operation, whilst the propeller has bonded on nickel alloy leading edges for superior erosion protection of the blades.
MT-Propeller is the world leading natural composite propeller manufacturer with 30 certified propeller models from two-blade to seven-blade hydraulically controlled variable pitch propeller, for engines producing up to 5000hp and two-blade to four-blade electrically controlled variable pitch propeller, for engines producing up to 350hp as well as two blade fixed pitch propellers. The high performance, light weight and durable MT-Propellers can be used on aircraft with piston engines and propeller turbines, as well as on airships, wind tunnels and hovercraft. MT-Propellers can be developed for nearly every aircraft type from motor gliders to regional airliners. Fulfilling the highest certification requirements, MT Propellers are also supplemental type certified on Part 25 aircraft.
MT-Propeller is holder of more than 220 Supplemental Type Certificate (STCs) worldwide and Original Equipment Manufacturers (OEM) supplier for more than 90% of the European Aircraft Industry as well as 30% of the US Aircraft Industry. More than 25,000 propeller systems with more than 85,000 blades are in service. 150 million fleet hours where already performed on MT-Propellers. A factory certified network of 62 service centres, provides best propeller service and maintenance all over the world.