Pratt & Whitney Canada PT6
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The PT6 is a turboprop aircraft engine manufactured by Pratt & Whitney Canada. It has an unusual design in that the air enters from the rear of the engine and the power section is at the front. However, it is the power section that requires the most maintenance and having it at the front makes it more accessible than burying it in an engine nacelle or the body of the aircraft.
Air enters the PT6A through a scoop at the rear of the engine, passes through a three-stage axial compressor, a single-stage radial compressor, then through the combustion chamber. The hot exhaust gases pass through a single-stage turbine which drives the engine compressor shaft, and then through a two-stage turbine which drives the propeller shaft, before exiting at the front of the engine. The PT6 is especially noted for its reliability and ease of maintenance. It is now sometimes chosen for projects simply because it is so well known and liked throughout the world.Pt6_turboprop.jpg
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Variants
PT6A
The PT6A is a free turbine providing 1,090 to 1,940 shaft horsepower (813 to 1,447 kW). Aircraft that it powers include:
- AASI Jetcruzer 500 (1 x PT6A-66A)
- Aero Ae 270 Ibis (1 x PT6A-42A)
- Beechcraft King Air (2 x PT6A-42)
- Beechcraft Starship (2 x PT6A-67A)
- CASA C.212 Aviocar series 300P (2 x PT6A-25)
- De Havilland Canada DHC-6 Twin Otter (2 x PT6A-20)
- De Havilland Canada Dash 7 (4 x PT6A-50)
- EMBRAER EMB 110 Bandeirante (2 x PT6A-34)
- EMBRAER EMB 121 Xingú (2 x PT6A-42)
- Harbin Y-12 (2 x PT6A-27)
- Melex M-18/T45 Turbine Dromedar (1 x PT6A-45)
- Piaggio P.180 Avanti (2 x PT6A-66A)
- Piper Malibu Meridian (1 x PT6A-42A)
- Pilatus PC-6 Turbo Porter (1 x PT6A-27)
- Pilatus PC-7 (1 x PT6A-25C)
- Pilatus PC-9 (1 x PT6A-62)
- Pilatus PC-12 (1 x PT6A-67B)
- Pilatus PC-21 (1 x PT6A-68B)
- PZL M-18/T45 Turbine Dromader (1 x PT6A-45)
- T-6 Texan II (1 x PT6A-68)
- Embraer
- Caraja,
- Bandeirante EMB-110 and EMB-111
- Tucano
- LET l410
- Raytheon Beech
- 1900 series
- Beech 99 series
- King Air 90 series
- King Air 200 series
- King Air 300 series
- Shorts
- 330,
- 360
- 360-300
- AMI DC3
- Air Tractor AT
- Ayres Turbo Thrush
- Basler Turbo BT-67
- Dornier Seastar
- CATIG/HAIG Y-12
- Cessena Caravan I
- Conair S2 Turbo-Firecat
- Croplease
- Fieldmaster
- Firemaster
- Fairchild Dornier Turbo Skyservant
- Frakes
- Mallard
- Turbocat
- Greenwich Aircraft DC-3
- Pacific Aerospace Cresco 750
- Polish Aviation Factory Skytruck
- Reims F406 Caravan II
- Schweizer AG-Cat Turbine
- Vazar Dash 3 Turbo Otter
- Wheatherly 620 TP
PT6B
The PT6B is 981 horsepower (732 kW) engine designed for helicopters. It powers the Augusta A119 Koala and the Sikorsky S-76B.
PT6C
The PT6C is a 1600 to 2300 horsepower (1190 to 1720 kW) engine for helicopters. It powers the Augusta Bell AB139, the Bell Augusta AB609, and the PZL-Swidnik Sokol.
PT6T
The PT6T/T400 is a twinned turboshaft designed for helicopters. It powers the Agusta Bell 212 and 412, the Bell AH1J, AH1T, CH-146 Griffon, and UH-1N, and the Sikorsky S-58T.
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