Propeller systems from Dowty Propellers are used on a full range of turboprop-powered civil airliners and transport aircraft in service today, and under development. The company benefits from a heritage that includes equipping the world’s first all-composite-bladed turboprop aircraft certified to FAR Part 25, and providing the initial full FADEC-integrated digital electronic propeller control system.
Dowty’s propeller systems are now used on engines from the world’s leading turboprop powerplant manufacturers.
R408 propeller system for the Bombardier Q400 Dash 8
Dowty Propellers’ six-blade R408 propeller system on the Bombardier Q400 Dash 8 incorporates an advanced swept blade design and optimized ARA-D/A airfoil sections.
It provides excellent climb and cruise performance for this twin-engine airliner, while generating low noise levels. The propeller system’s high-integrity, all-composite blades are rugged and service-proven, rugged construction, with low weight and a highly effective erosion protection system.
Installed on the aircraft’s 4,850-shp. Pratt & Whitney Canada PW150A turboprop engines, the R408 propeller system incorporates a fail-safe electronic control system, precise speed selection and synchrophasing accuracy. The system’s modular configuration is designed for low maintenance costs, eliminating mechanical linkages to cockpit. The one-piece hub facilitates individual removal and replacement of the blades, which are counterweighted to assure safe coarse-seeking operation.
The propeller system’s components are the propellers and backplate, spinner, propeller electronic controller, de-icer timer, beta tube assembly, pitch control unit, overspeed governor, auxiliary pump and brush block bracket assembly.
The Antonov AN-132D’s R408 propeller system
Dowty Propellers’ R408 propeller systems for the twin-engine Antonov AN-132D civil transport aircraft demonstrator are equipped with six all-composite propeller blades.
These propeller systems are installed on the AN-132D’s Pratt & Whitney Canada PW150A turboprop engines, which have logged millions of flight hours powering the R408 propeller systems on other aircraft.
The AN-132D demonstrator is being developed by Antonov with participation from Saudi Arabia’s King Abdulaziz City for Science and Technology (KACST).
Dowty Propellers assisted in the R408 propeller system’s integration and commissioning on the AN-132D demonstrator, and provided training for personnel from both Antonov and KACST. Technical support from Dowty Propellers will continue for the AN-132D’s flight test phase, as well as the multi-purpose aircraft’s demonstration flights.
R408 propeller system for the AVIC MA700
The R408 propeller system from Dowty Propellers has been selected for AVIC’s MA700, to be powered by two Pratt & Whitney Canada PW150C turboprop powerplants.
As an all-new turboprop aircraft developed in China, the Dowty Propellers-equipped MA700 is designed as a medium-capacity regional aircraft, with the capability of operating in high altitude, high temperature locations.
In addition to providing the R408 propeller system, Dowty Propellers also was chosen to develop and supply the propeller electronic controller (PEC) – which manages the propeller system’s automatic control, including propeller speed and pitch, through all phases of flight. For the MA700, Dowty Propellers’ solution is a dual-band PEC, based on a flexible, modern design which incorporates the latest technology and utilises an open architecture.
R381 propeller system for the Saab 2000
The Dowty Propellers R381 was the world’s first propeller system to be controlled by an integrated FADEC (full authority digital engine control), both for in-flight and on-ground operations. It has six all-composite swept-design propeller blades, which are driven by the Saab 2000’s two 4,000 shp.-category Rolls-Royce AE 2100A turboprop engines.
Dowty Propellers’ propeller system for the Saab 2000 also includes the pitch control unit, feathering pump, over-speed governor, timer monitor control unit and brush block bracket kit.
Saab 340 R390 propeller system
The Dowty Propellers R390 propeller system for Saab 340s marked the world’s first use of composite propellers on a FAR Part 25-certified aircraft. Since the service entry of this twin-engine regional airliner in 1984, the fleet-leading propeller blades have logged more than 40,000 flying hours.
The Saab 340’s 1,750-shp. General Electric CT7 turboprop engines are equipped with four-blade propellers Dowty Propellers’ propeller system for the aircraft also incorporates the feathering pump, pitch control unit, over-speed governor and synchrophaser.
The Fokker 50’s R352/R410 propeller system
Dowty Propellers utilized the same composite blade technology developed for the Saab 340 in the Fokker 50’s R352 propeller system, and used its expertise for the world’s first development of an electronically-controlled propeller system. The Propeller Electronic Controller (PEC) developed for the Fokker 50 aircraft provides in-flight propeller speed and synchrophase control, while retaining an element of hydro-mechanical control for ground operation.
The Fokker 50’s two Pratt & Whitney Canada 2,500 shp. PW125 engines drive six-blade propellers, with the complete propeller system incorporating the Dowty Propellers-supplied Propeller Electronic Controller, pitch control unit, feathering pump, over-speed governor and brush block bracket kit.
A stretched-fuselage version of the aircraft, designed the Fokker 60, is powered by the Dowty Propellers’ R410 propeller system, tailored for this variant’s Pratt & Whitney Canada PW127 turboprop engines.