Pratt & Whitney Canada PT6

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Image:Turboprop P&W PT6A-67D.jpg The PT6 is a turboprop aircraft engine manufactured by Pratt & Whitney Canada and is the most popular turboprop in history [1]. 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.

1 Variants
- 1.1 PT6A
- 1.2 PT6B
- 1.3 PT6C
- 1.4 PT6T
- 1.5 ST6
2 External links

[edit] Variants

[edit] PT6A

The PT6A is a free turbine providing 580 to 1,940 shaft horsepower (433 to 1,447 kW). Aircraft that it powers include:

AASI Jetcruzer 500 (1 x PT6A-66A)
Aero Ae 270 Ibis (1 x PT6A-42A)
Air Tractor AT
AMI DC3
Ayres Turbo Thrush
Beechcraft (Raytheon):
- Beechcraft King Air (2 x PT6A-42)
- Beechcraft Starship (2 x PT6A-67A)
- Beechcraft 99/C99 (2 x PT6A-27/2 x PT6A-36)
- Beechcraft 1900 (2 x PT6A-65C (1900C), or PT6A-67D (1900D))
Basler Turbo BT-67
CASA C.212 Aviocar series 300P (2 x PT6A-25)
CATIG/HAIG Y-12
Cessna Caravan I (1 x PT6A-114)
Conair S2 Turbo-Firecat
Croplease
De Havilland Canada DHC-6 Twin Otter (2 x PT6A-20)
De Havilland Canada Dash 7 (4 x PT6A-50)
Dornier Seastar
Embraer
- Bandeirante EMB-110 and EMB-111
- Tucano (1 x PT6A-25C)
- Embraer EMB 110 Bandeirante (2 x PT6A-34)
- Embraer EMB 121 Xingu (2 x PT6A-42)
Fieldmaster
Firemaster
Fairchild Dornier Turbo Skyservant
Frakes
- Mallard
- Turbocat
Greenwich Aircraft DC-3
Harbin Y-12 (2 x PT6A-27)
LET L410
Pacific Aerospace Corporation (PAC)
- Cresco (1 x PT6A-34)
- 750 XL (1 x PT6A-34)
Piaggio P.180 Avanti (2 x PT6A-66A)
Piper Cheyenne, I, IA, II, IIXL, III, IIIA (2 x PT6A-11/28/41/61/135)
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)
PZL M-28 Skytruck
PZL-130 Orlik TC-II(1 x PT6A-25P)
Quest Kodiak (1 x PT6A-34)
Reims F406 Caravan II
Scaled Composites Model 133 ATTT (2 x PT6A-135A)
Shorts 330 (2 x PT6A-45)
Shorts 360 (2 x PT6A-65R)
Shorts 360-300 (2 x PT6A-67R)
Socata TBM-700/850
T-34C Turbo Mentor (1 x PT6A-25)
T-6 Texan II (1 x PT6A-68)
Saras (Civilian Aircraft)
Schweizer AG-Cat Turbine
Vazar Dash 3 Turbo Otter
Wheatherly 620 TP

[edit] PT6B

The PT6B is 981 horsepower (732 kW) engine designed for helicopters. It powers the Agusta A119 Koala and the Sikorsky S-76B..

[edit] PT6C

The PT6C is a 1600 to 2300 horsepower (1190 to 1720 kW) engine for helicopters/tiltrotors. It powers the Agusta Bell AB139 and the PZL-Swidnik Sokol helicopters, and the Bell/Agusta BA609 tiltrotor.

[edit] PT6T

The PT6T/T400 is a twinned turboshaft designed for helicopters. It powers the Agusta Bell 212 and 412, the Bell AH-1J, AH-1T, CH-146 Griffon, and UH-1N, and the Sikorsky S-58T.

[edit] ST6

The ST6 is a variant of the PT6 that was developed as a powerplant for train locomotives. The project was abandoned for multiple reasons but mainly because the train maintenance technicians weren't used to repairing delicate jet engines and ended up breaking them.