MTV-9 is an aircraft propeller offering that turns rotational shaft power into aerodynamic thrust. It is intended for a propulsion installation where the blade configuration and operating limits are matched to the engine and airframe.
The MTV-9 is a three-blade constant-speed aircraft propeller from MT-Propeller, a German manufacturer based in Atting, Bavaria. This listing covers the MTV-9-B/198-52 configuration offered under a supplemental type certificate for the Cessna 177A, 177B, 177RG and F177RG, which are single-engine piston aircraft with O-360-series and IO-360-series engines. It converts engine shaft power into thrust and replaces the original metal propeller on these aircraft.
The propeller has three blades with a scimitar shape, made of a light-weight natural composite, and a milled single-piece aluminium hub. The designation 198-52 refers to the blade, and the propeller diameter is 198 cm (78 in), with a minimum diameter of 193 cm (76 in), which is the limit to which the blades may be shortened after repair. A constant-speed propeller keeps the engine at the speed set by the pilot by changing blade pitch automatically, which gives take-off power, climb and cruise from one unit.
MT-Propeller states several performance and handling effects for this installation. Climb performance is improved by 10 percent, ground roll and take-off distance over a 50 ft obstacle are reduced by about 40 m, and speed increases by up to 5 mph. The propeller is about 7 kg (15.43 lb) lighter than the three-blade metal propeller it replaces. The composite blades damp vibration, which the maker links to almost vibration-free operation, and the performance gain includes an increase in maximum take-off weight under ISA conditions.
The blades have a bonded stainless-steel leading edge that protects them against erosion, an unlimited blade life, and can be repaired after foreign-object damage (FOD). These properties reduce the ground time and replacement cost over the life of the aircraft, which matters for operators and maintenance organisations.
Certification is by approval of the European Union Aviation Safety Agency and the US Federal Aviation Administration. MT-Propeller publishes both STC documents for this installation: the EASA approval is numbered EASA10054682 and the FAA approval SA03699NY. MT-Propeller states that it holds more than 230 supplemental type certificates worldwide. Typical applications are the retrofit of propellers on general-aviation single-engine aircraft by owners, operators and maintenance shops, with the STC defining the installation.
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