Pratt & Whitney Canada PT6

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PT6
P&W PT6 (cropped).jpg
A PT6A-20 on display at the Canada Aviation and Space Museum
Type Turboprop / turboshaft
National origin Canada
Manufacturer Pratt & Whitney Canada
First run1960 [1]
Major applications AgustaWestland AW139
Beech King Air and Super King Air
Cessna 208 Caravan
de Havilland Canada DHC-6 Twin Otter
Pilatus PC-12
Piper M700 Fury
Number built51,000 (as of November 2015) [2] [ needs update ]
Variants Pratt & Whitney Canada PT6T

The Pratt & Whitney Canada PT6 is a turboprop aircraft engine produced by Pratt & Whitney Canada. Its design was started in 1958, it first ran in February 1960, first flew on 30 May 1961, entered service in 1964, and has been continuously updated since. The PT6 consists of two basic sections: a gas generator with accessory gearbox, and a free-power turbine with reduction gearbox. In aircraft, the engine is often mounted "backwards," with the intake at the rear and the exhaust at the front, so that the turbine is directly connected to the propeller. Many variants of the PT6 have been produced, not only as turboprops but also as turboshaft engines for helicopters, land vehicles, hovercraft, and boats; as auxiliary power units; and for industrial uses. By November 2015, 51,000 had been produced, which had logged 400 million flight hours from 1963 to 2016. It is known for its reliability, with an in-flight shutdown rate of 1 per 651,126 hours in 2016. The PT6A turboprop engine covers the power range between 580 and 1,940 shp (430 and 1,450 kW), while the PT6B/C are turboshaft variants for helicopters.

Contents

Development

In 1956, Pratt & Whitney Canada's (PWC) president, Ronald Riley, ordered engineering manager Dick Guthrie to hire a team of gas turbine specialists to design a small gas turbine engine. Demand for the Wasp radial engine was still strong and its production was profitable but the aim was to become Canada's prime engine company by focusing on a small gas turbine engine. Riley gave Guthrie a modest budget of C$100,000. Guthrie recruited twelve engineers with experience gained at various places including the National Research Council in Ottawa, Orenda Engines in Ontario, Bristol Aero Engines and Blackburn Aircraft. [3] They completed the detailed design of an engine for Canadair's small jet trainer, the CL-41. It was a 3,000-pound-force (13 kN) thrust turbojet but the design was taken over by P&WA who developed it into the Pratt & Whitney JT12. The team had to wait for market assessments to define their next engine, a 450 shaft horsepower (340 kW) turboprop for twin-engined aircraft, the PT6. [4] The early development of the PT6, which first ran in December 1963, [1] [5] was beset with engineering problems, cost overruns and lack of sales. It was almost cancelled. [4] The team lacked the ability to deal with the technical difficulties, i.e. how to develop the engine, because, as one of the team Elvie Smith recalled, they came from research and design backgrounds. They learned how to run a development program, such as testing around the clock rather than on one shift, from a PWA team which directed the development for several months. [6]

The PT6 first flew on 30 May 1961, mounted as a third engine in the nose of a Beech 18 aircraft which had been converted by de Havilland at its Downsview facility in North York, Ontario. Full-scale production started in 1963, with service entry the following year. The Beech 18 continued as a PT6 and propeller flying test-bed until it was replaced with a Beech King Air in 1980. The King Air test-engine or propeller replaced one of the standard ones. In 1974 the Beech 18 had been unable to fly fast enough and high enough to test the PT6A-50 for the de Havilland Canada Dash 7 so a Vickers Viscount was modified as a PT6 test-bed with a Dash-7 installation in the nose. [7]

The first production PT6 model, the PT6A-6, was certificated in December 1963. The first application was the Beech Queen Air, enticing the U.S. Army to buy a fleet of the U-21 Ute variant. This helped launch the King Air with Beechcraft selling about 7,000 by 2012. [8] From 1963 to 2016 power-to-weight ratio was improved by 50%, brake specific fuel consumption by 20% and overall pressure ratio reached 14:1. [9] Its development continues and while today its basic configuration is the same as in 1964, updates have included a cooled first-stage turbine vane, additional compressor and turbine stages and single-crystal turbine blades in the early 1990s. Its pressure ratio is 13:1 in the AgustaWestland AW609 tiltrotor, the highest that can be used without cooled turbine blades. [10]

In response to the General Electric GE93, in 2017 Pratt & Whitney Canada started testing core technology and systems for a proposed 2,000 shp (1,500 kW) engine to replace the most powerful versions of the PT6. [11] It was considered likely to be a development of the PT6C core, and would fit between the 1,750 shp (1,300 kW) PT6C-67C/E and the 2,300 shp (1,700 kW) PW100 family. It was expected to be ready to launch by the end of 2017 for an initial helicopter platform with a 10-15% reduction in brake specific fuel consumption. [12] This 2,000 hp engine would target a possible new market such as a Super PC-12, a more powerful TBM, or a bigger King Air. [13]

PW100

When de Havilland Canada asked for a much larger engine for the DHC-8, roughly twice the power of the Large PT6, Pratt & Whitney Canada responded with a new design initially known as the PT7, later renamed Pratt & Whitney Canada PW100.

Design

Epicyclic reduction gears on Pratt & Whitney Canada PT6 gas turbine engine. Reduction Gear.jpg
Epicyclic reduction gears on Pratt & Whitney Canada PT6 gas turbine engine.

The rate at which parts deteriorate in a gas turbine is unbalanced insofar as the hottest parts need replacing or repairing more often than the cooler-running parts. If the hotter parts can be removed without disturbing the rest of the engine, for example without removing the complete engine from the aircraft, maintenance costs are reduced. It was achieved with the PT6 by having the hottest parts, the gas generator turbine and combustor, at the propeller end. They are removed without disturbing the rest of the engine with its connections to the aircraft. This arrangement was patented by designer Newland, one of the original PT6 team. [14] A similar general arrangement with a free-turbine power take-off at the exhaust end (the 1,000 shp (750 kW) P.181 engine) had been shown by Armstrong Siddeley Motors at the Farnborough Airshow in 1957. [15]

An early design improvement, incorporated in the PT6A-20, [16] was the pipe diffuser patented by Vrana, another of the original PT6 team. [17] It replaced the vaned type diffuser used in centrifugal compressors. The pipe diffuser became standard design practice for P&WC. [18] Another design change improved the part-speed functioning of the compressor. It is common to bleed air from a compressor to make it work properly at low engine speeds. The PT6 has a bleed arrangement which reuses the bleed air by returning it in a tangential direction at the entry to the compressor, an idea patented by Schaum et al. and titled "Turbine Engine With Induced Pre-Swirl at Compressor Inlet". [19] It acts like a variable vane and is known as a "Jet-Flap".

All versions of the engine consist of two sections that can be easily separated for maintenance: a gas generator supplies hot pressurized gas to a free power turbine. [20] The starter has to accelerate only the gas generator, making the engine easy to start, particularly in cold weather. [20] Air enters the gas-generator through an inlet screen into the low-pressure axial compressor. This has three stages on small and medium versions of the engine and four stages on large versions. The air then flows into a single-stage centrifugal compressor, through a folded annular combustion chamber, and finally through a single-stage turbine that powers the compressors at about 45,000 rpm. Hot gas from the gas generator flows into the power turbine, which turns at about 30,000 rpm. It has one stage on the small engines and two stages on the medium and large ones. For turboprop use, this powers a two-stage planetary output reduction gearbox, which turns the propeller at a speed of 1,900 to 2,200 rpm. The exhaust gas then escapes through two side-mounted ducts in the power turbine housing. The turbines are concentric with the combustion chamber, reducing overall length.

In most aircraft installations the PT6 is mounted so that the intake end of the engine is towards the rear of the aircraft, leading to it being known by many as the "back-to-front" engine. [4] This places the power section at the front of the nacelle, where it can drive the propeller directly without the need for a long shaft. Intake air is usually fed to the engine via an underside mounted duct, and the two exhaust outlets are directed rearward. This arrangement aids maintenance by allowing the entire power section to be removed along with the propeller, exposing the gas-generator section. To facilitate rough-field operations, foreign objects are diverted from the compressor intake by inertial separators in the inlet. [21] In some installation such as the PT6A-66B version in the Piaggio P.180 Avanti, the engine is reversed, with the propeller acting as a "pusher", the accessory gearbox facing the front of the aircraft.

From left to right: propeller mount, reduction gear, exhaust, 2-stage free power turbine, 1-stage gas generator turbine surrounded by the combustor, 1 centrifugal then 4 axial compressor stages, intake, and accessories EBACE 2018, Le Grand-Saconnex (BL7C0410) (cropped).jpg
From left to right: propeller mount, reduction gear, exhaust, 2-stage free power turbine, 1-stage gas generator turbine surrounded by the combustor, 1 centrifugal then 4 axial compressor stages, intake, and accessories

Operational history

By the 40th anniversary of its maiden flight in 2001, over 36,000 PT6As had been delivered, not including the other versions. [22] Up to October 2003, 31,606 delivered engines have flown more than 252 million hours. [23] Till November 2015, 51,000 have been produced. [2] The family logged 400 million flight hours from 1963 to 2016. [9]

The PT6 family is known for its reliability with an in-flight shutdown rate of 1 per 333,333 hours up to October 2003, [23] 1 per 127,560 hours in 2005 in Canada, [24] 1 per 333,000 hours from 1963 to 2016, [9] 1 per 651,126 hours over 12 months in 2016. [25] Time between overhauls is between 3,600 and 9,000 hours and hot-section inspections between 1,800 and 2,000 hours. [26]

Early PT6 versions lacked a FADEC, autothrottle could be installed as an aftermarket upgrade with an actuator, initially for single-engine aircraft like the PC-12 and potentially in twin-turboprop aircraft. [27] In October 2019 the PT6 E-Series was launched on the PC-12 NGX, the first general aviation turboprop with an electronic propeller and engine control system with a single lever and better monitoring for longer maintenance intervals, increased from 300 to 600 hours, and a TBO increased by 43% to 5,000 hours, reducing engine operating costs by at least 15%. [28] In April 2022, Daher announced that the updated SOCATA TBM-960 would be powered by the PT6E-66XT. [29]

Variants

A PT6A-67D engine on a Beechcraft 1900D. The turbine exhaust (copper-colored pipe) is prominent. Turboprop P&W PT6A-67D.jpg
A PT6A-67D engine on a Beechcraft 1900D. The turbine exhaust (copper-colored pipe) is prominent.

The main variant, the PT6A, is available in a wide variety of models, covering the power range between 580 and 920 shaft horsepower (430 and 690 kilowatts ) in the original series, and up to 1,940 shaft horsepower (1,450 kilowatts) in the 'large' lines. The PT6B and PT6C are turboshaft variants for helicopters. In US military use, they are designated as T74 or T101.

Several other versions of the PT6 have appeared over time:

The PT6A family is a series of free-turbine turboprop engines providing 500 to 1,940 shaft horsepower (370 to 1,450 kilowatts)

Small

Small [32]
variant equivalent
shaft
horsepower
(eshp)		shaft
horsepower
(shp)		applications [33]
PT6A-6, 6A, 6B525500Heron-TP-XP UAV from Israel [34]
PT6A-11528500
PT6A-11AG580550 Air Tractor AT-400 (402A / 402B)
Schweizer Ag-Cat G-164B Turbine
PT6A-15AG715680 Air Tractor AT-400 (402A/402B)
Air Tractor AT-502, -502A and -502B
Frakes Turbocat Model A / B / C
Schweizer Ag-Cat G-164B Turbine
PT6A-20579550 De Havilland Canada DHC-6 Twin Otter Srs. 100-200
PT6A-20A, -20B, -6/C20579550
PT6A-21580550 Beechcraft King Air C90A / B / SE
Beechcraft Bonanza (turbine conversion)
Royal Turbine Duke
Evektor EV-55 Outback
PT6A-25, -25A580550 Beechcraft T-34C Turbo Mentor
Pilatus PC-7 Turbo Trainer
PT6A-25C783750 Embraer EMB 312 Tucano
Pilatus PC-7 Mk.II M
PZL-130 Orlik / TC-II Turbo-Orlik
PT6A-27715680 Beechcraft Model 99A, B99
De Havilland Canada DHC-6 Twin Otter 300
Harbin Y-12 (CATIC / HAIG)
Embraer EMB 110 Bandeirante
Let L-410 Turbolet
Pilatus PC-6/B Turbo-Porter
PT6A-28715680 Embraer EMB 121 Xingu
Beechcraft King Air 100 Series
PT6A-29778750
PT6A-34783750 Embraer EMB 110 Bandeirante/111
Embraer EMB 821 Carajá
Grumman Mallard (Frakes turbine conversion)
JetPROP DLX
PAC P-750 XSTOL (750XL)
Quest Kodiak (Daher)
Vazar Dash 3 Turbine Otter
De Havilland Canada DHC-6 Twin Otter 400
Thrush S2R-T34
Pilatus PC-6/B Turbo-Porter (STC)

BX Turbo de Havilland Canada Beaver DHC-2 (STC)
ARON M80 (WIG CRAFT)

PT6A-34B783750
PT6A-34AG783750 Air Tractor AT-502B
Frakes/Grumman Turbo-Cat Model A / B / C
Pacific Aerospace 750
PZL-Okecie PZL-106 Turbo Kruk
Schweizer Ag-Cat G-164B/D Turbine
Thrush Model 510P
Thrush S2R-T34
PT6A-35787750 Blue 35
JetPROP DLX
PT6A-36783750Thrush S2R-T34 (dry configuration only)
PT6A-38801750
PT6A-110502475Schweizer AG-Cat Turbine
Royal Turbine Duke
PT6A-112528500 Cessna Conquest I
PT6A-114632600 Cessna 208 Caravan
PT6A-114A725675 Cessna 208 Caravan 675, 208B
PT6A-116736700
PT6A-121647615
PT6A-135787750
PT6A-135A787750 Beechcraft King Air F90-1 / C90GT / C90GTi / C90GTx
Blackhawk XP135A Cheyenne Series
Blackhawk XP135A Conquest I
Blackhawk XP135A King Air 90 Series
Cessna Conquest I
JMB Evolution (formerly Lancair Evolution)
Silverhawk 135 / StandardAero C90 / E90
StandardAero Cheyenne Series
StandardAero King Air F90
T-G Aviation Super Cheyenne
Vazar Dash 3 Turbine Otter
PT6A-140912867Cessna Grand Caravan EX
PT6A-140A945900 ASIC ULtimate Grand Caravan (upgrade)
Blackhawk Aerospace XP140 (Caravan upgrade)
Evolution Aircraft EVOT-850 (formerly Lancair)
PT6A-140AG911867Air Tractor 502XP
Thrush Model 510P


Medium

Medium [32]
variant equivalent
shaft
horsepower
(eshp)		shaft
horsepower
(shp)		applications [33]
PT6A-40749700
PT6A-41, -41AG903850 Beechcraft King Air 200 / B200
Piper Cheyenne III / IIIA
Beechcraft C-12 Huron
Thrush S2R-T34 (-41 and -41AG)
PT6A-42, -42A903850 Beechcraft C-12 Huron E and F
Beechcraft King Air 200 / B200
Blackhawk XP42 King Air 200
StandardAero King Air 200
Blackhawk XP42A C-208 Caravan Series (-42A)
Piper Meridian (-42A)
Thrush S2R-T34
Indonesian Aerospace N-219
PT6A-4510701020
PT6A-45R, -45A, -45B
PT6A-501022973 de Havilland Canada DHC-7 Dash 7
PT6A-52898850 Beechcraft King Air B200GT / 250
Blackhawk XP52 King Air 200 / B200
Enhanced Aero B200GTO
StandardAero King Air 200 / B200

Piper PA-46 (M700 Fury)

PT6A-60, -60A11131050 Beechcraft Super King Air 300 / 350
PT6A-60AG10811020 Air Tractor AT-602
Ayres Thrush 550P
Ayres Thrush 660
PT6A-61902850 Short C-23 Sherpa
PT6A-621008950 [35] KAI KT-1 / KO-1
Pilatus PC-9 Turbo Trainer

Large

Large [36]
variant equivalent
shaft
horsepower
(eshp)		shaft
horsepower
(shp)		applications [33]
PT6A-64747700EADS Socata TBM 700
PT6A-65B, -65R [32] 12491173 Beechcraft 1900 / 1900C
Polish Aviation Factory M28 Skytruck
PT6A-65AG, -65AR [32] 12981220 Air Tractor AT-602
Air Tractor AT-802 / 802A / 802AF / 802F
Ayres Thrush 660 / 710P
AMI DC-3 (-65R)
Dodson International Turbo Dakota DC-3
Shorts 360 Advanced (-65AR)
PT6A-65SC1100 Cessna 408 SkyCourier
PT6A-66, -66A, -66D905850National Aerospace Laboratories SARAS
Piaggio P.180 Avanti
Ibis Ae270 HP (-66A)
Daher TBM 850, 900, 910, 930 and 940 (formerly EADS Socata TBM) (-66D)
PT6A-66B, -66T1010950 Piaggio P180 Avanti II (-66B)
PT6A-67, -67A, -67B12731200 Beechcraft RC-12 Guardrail (-67)
Beechcraft Starship (-67A)
Epic LT (-67A)
IAI Heron TP (-67A)
PT6A-67B, -67P
PT6E-67XP		12721200 Pilatus PC-12 (-67B)
Pilatus PC-12NG (-67P)
Pilatus PC-12NGX (PT6E-67XP)
PT6A-67D12851214 Beechcraft 1900D
PT6A-67AF, -67AG, -67R, -67T, -67RM12941220 Air Tractor AT-802 / 802A / 802AF / 802F (-67AG)
Ayres Thrush 710P (-67AG)
Basler Turbo BT-67 (-67R)
Shorts 360 / 360–300 (-67R)
PT6A-67E12761200
PT6A-67F17961700 Air Tractor AT-802 / 802A / 802AF / 802F
PT6A-6813241250 T-6A Texan II
PT6A-68B, -68C, -68T, -68D16911600 Pilatus PC-21 (-68B)
Embraer EMB-314 Super Tucano (-68C)
TAI Hürkuş (-68T)
T74-CP-700
(PT6A-20) United States military designation for the PT6A-20/27, used in the Beechcraft U-21 Ute.
T74-CP-702
(PT6A-29)
T101
United States military designation for the T101-CP-100 / PT6A-45R, used in the Shorts 330 and Shorts C-23 Sherpa.
PT6B-9
The PT6B-9 is a 550 horsepower (410.1 kilowatts) turboshaft engine for use in helicopters; a later mark of PT6B is rated at 981 horsepower (731.5 kilowatts).
PT6B-16
PT6C
The PT6C is a 1,600 to 2,300 shaft horsepower (1,200 to 1,700 kilowatts) engine for helicopters and tiltrotors.
PT6D-114A
The PT6D-114A is based on the PT6A-114A; the main difference is the deletion of the second-stage reduction gearing and output shaft, because the engine is intended for integration with a combining gearbox incorporating power turbine governors and a propeller output shaft. [37]
Soloy Dual Pac
2x PT6D-114A engines driving a single propeller through a combining gearbox, capable of independent operation.
PT6T
Twin PT6 power units combining outputs through a gearbox for use in helicopters.
ST6
The ST6 is a variant of the PT6 that was originally developed as a powerplant for the UAC TurboTrain power cars, but later developed as a stationary power generator and auxiliary power unit.
ST6B
The ST6B-62 was a 550 brake horsepower (410 kilowatts) version of the PT6 developed for use in the STP-Paxton Turbocar, raced in the 1967 Indianapolis 500. [38]
STN 6/76
The STN 6/76 was a 500 brake horsepower (370 kilowatts) version of the PT6 developed for use in the Lotus 56, raced in the 1968 Indianapolis 500 and later in Formula One races, in 1971. [39] [40]

Applications

The engine is used in over 100 different applications.

PT6A

PT6B

PT6C

PT6D

PT6E

ST6

STN

Engines on display

Specifications (PT6A-6)

Data from Jane's 62-63, [43]

General characteristics

Components

Performance

Gas Turbine Engines

Gas Turbine Engines [44]
modelstages [a] powerSFC /hOPRdia.leng.weightapplications
hpkWlb/hpg/kWlbkg
PT6A-213, 1 / 1, 15504100.63380—19 in
48 cm		62 in
1.6 m		327148 Beech Bonanza, King Air C90A/B/SE
PT6A-253, 1 / 1, 15504100.63380—353160 Beech T-34C
PT6A-25C3, 1 / 1, 17505600.595362—338153 Embraer Tucano, Pilatus PC-7, PZL-130 Orlik
PT6A-273, 1 / 1, 17155330.603367—289131 Pilatus PC-6
PT6A-114/A3, 1 / 1, 1600–675447–5030.64390—350160 Cessna 208 Caravan
PT6A-135A3, 1 / 1, 17505600.5853567338153 Cessna Conquest, Piper Cheyenne, Beech King Air F90
PT6A-423, 1 / 1, 28506300.601366866.9 in
1.70 m		403183 Beech King Air 200/B200, C-12 Huron
PT6A-60A4, 1 / 1, 21,0507800.5483338.572.5 in
1.84 m		487221 Beech Super King Air 300/350
PT6A-644, 1 / 1, 27005200.7034288.570 in
1.8 m		456207 Socata TBM 700
PT6A-664, 1 / 1, 28506300.623809.5456207 Piaggio P.180 Avanti
PT6A-65B4, 1 / 1, 21,1008200.536326—74 in
1.9 m		481218 Ayres Turbo-Thrush, PZL M28 Skytruck, Beech 1900/C
PT6A-67B4, 1 / 1, 21,2008900.54633210.8530240 Pilatus PC-12
PT6A-67D4, 1 / 1, 21,2719480.54633210.8515234 Beech 1900D
PT6A-684, 1 / 1, 21,2509300.54330—72.2 in
1.83 m		572259 Beech T-6 Texan II
PT6A-68B4, 1 / 1, 21,6001,2000.54330—575261118 Pilatus PC-21
PT6B-37A3, 1 / 1, 19006700.584355—19.5 in
50 cm		64.4 in
1.64 m		385175 Agusta A119 Koala
PT6C-67A4, 1 / 1, 11,9401,4500.47290—22.5 in
57 cm		59.3 in
1.51 m		—— Bell/Agusta BA609
PT6C-67C4, 1 / 1, 21,1008200.49300——— Agusta A 139
PT6T-3B/BF2 × 3, 1 / 1, 11,8001,3000.6360—43.5 in
110 cm		65.8 in
1.67 m		668303 Bell 412/SP/HP/EP
PT6T-3D/DF2 × 3, 1 / 1, 11,8001,3000.595362—692–681314–309 Bell 412/SP/HP/EP
PT6T-62 × 3, 1 / 1, 11,8751,3980.591359—660300 Bell 212, 412/SP/HP/EP, Sikorsky S-58T
PT6T-682 × 3, 1 / 1, 11,9701,4700.591359—665302 Bell 412HP
  1. ↑ compressor / HP, LP turbine

See also

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The Walter M601 is a turboprop aircraft engine produced by Walter Aircraft Engines of the Czech Republic. The company's first turboprop, the M601 is used in business, agricultural and military training aircraft.

<span class="mw-page-title-main">Pratt & Whitney Canada PT6T</span> Helicopter turboshaft engine

The Pratt & Whitney Canada PT6T Twin-Pac is a turboshaft engine designed for helicopters. Manufactured by Pratt & Whitney Canada, its first application was in the Bell 212 and UH-1N Twin Huey helicopter family. The PT6T Twin-Pac consists of two PT6A power turbines driving a common output reduction gearbox, producing up to 2,000 hp at 6,000 rpm. The engine is designated T400 by the U.S. military.

<span class="mw-page-title-main">Garrett TPF351</span> 1980s American turboprop engine

The Garrett TPF351 is a turboprop engine designed by Garrett Engine Division of AlliedSignal Aerospace Company. Initiated by Garrett in October 1987, the TPF351-20 engine was selected by Embraer to power the Embraer/FMA CBA 123 Vector, a high-speed commuter "pusher" aircraft. It was first tested on May 19, 1989 and then ground tested and flight tested on a Boeing 720 on July 9, 1990. The first prototype CBA 123 was tested on July 18, 1990, followed by a flight to the Farnborough Air Show in September of the same year. Both programs were cancelled in 1992, when the TPF351 was nine months from engine certification.

<span class="mw-page-title-main">Allison T38</span>

The Allison T38 was an early turboprop engine developed by Allison Engine Company during the late 1940s. The T38 became the basis for the very successful family of Allison T56 turboprop engine.

<span class="mw-page-title-main">General Electric H-Series</span>

The General Electric H-Series is a family of turboprop aircraft engines produced by GE BGA Turboprops. The initial H80 is an updated derivative of the Walter M601, while the H75 and H85 are later derivatives.

<span class="mw-page-title-main">Evektor EV-55 Outback</span> Utility aircraft

The Evektor EV-55 Outback is a twin-engine turboprop aircraft designed and built in the Czech Republic by Evektor-Aerotechnik. The prototype first flew on 24 June 2011. The project's development was suspended in March 2017.

<span class="mw-page-title-main">Free-turbine turboshaft</span>

A free-turbine turboshaft is a form of turboshaft or turboprop gas turbine engine where the power is extracted from the exhaust stream of a gas turbine by an independent turbine, downstream of the gas turbine. The power turbine is not mechanically connected to the turbines that drive the compressors, hence the term "free", referring to the independence of the power output shaft. This is opposed to the power being extracted from the turbine/compressor shaft via a gearbox.

<span class="mw-page-title-main">General Electric Catalyst</span> Turboprop engine model

The General Electric Catalyst is a turboprop engine by GE Aerospace. It was announced on 16 November 2015 and will power the Beechcraft Denali, it first ran on December 22, 2017, and should be certified in 2024. The 850 to 1,600 hp engine aims for 20% better efficiency than its competition thanks to a 16:1 overall pressure ratio, variable stator vanes, cooled turbine blades, 3D printed parts and FADEC.

<span class="mw-page-title-main">Pratt & Whitney XT57</span>

The Pratt & Whitney XT57 was an axial-flow turboprop engine developed by Pratt & Whitney in the mid-1950s. The XT57 was developed from the Pratt & Whitney J57 turbojet.

References

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    2. 1 2 "GE, Textron team up to make new turboprop engine, aircraft". Reuters. 16 November 2015.
    3. ↑ Power - The Pratt & Whitney Canada Story, Kenneth H. Sullivan & Larry Milberry, CANAV Books 1989, ISBN   0-921022-01-8, p. 116
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