The Pratt & Whitney Canada JT15D is a small turbofan engine built by Pratt & Whitney Canada. It was introduced in 1971 at thrust, and has since undergone a series of upgrades to just over thrust in the latest versions. It is the primary powerplant for a wide variety of smaller jet aircraft, notably business jets.
Design and development The JT15D was first run in 1967. Its use of a centrifugal compressor as the high-pressure stage in a turbofan engine was followed in 1970 by the Garrett TFE731.The Development Of Jet And Turbine Aero Engines 4th Edition, Bill Gunston 2006,, p.185. The fan for the original JT15D-1 was aerodynamically scaled to 75 lb/sec using the much larger Pratt & Whitney JT9D fan, first used on the Boeing 747.Gunston 1989, p.131.
About 70% of the air passing through the fan goes down the bypass duct. The JT15D-4 and later variants use a "booster" axial stage behind the fan which runs at the same speed as the fan and directs the remaining 30% of the air into the high-pressure compressor, after which it passes into a reverse-flow annular combustor. The hot gases flow through a high-pressure turbine that drives the centrifugal compressor, and a low-pressure turbine that drives the fan and booster.
The engine was first run in August 1967 before being test flown on an Avro Canada CF-100 Canuck in an underslung external test pod. In 1975 a unique over-wing installation in place of Pratt & Whitney Canada PT6 turboprops was fitted to a Beechcraft Super King Air and flown for 93 hours to investigate the use of turbofan engines on that airframe.
Variants
JT15D-1The first model was introduced to power the Cessna Citation I, then known as the Fanjet 500. Deliveries started in 1972, and eventually on 1,417 -1s were delivered. JT15D-1A JT15D-1B JT15D-4Introduced in 1973, improving thrust to . The -4 was the primary engine for the Cessna Citation II, and went on to find use on the Mitsubishi Diamond 1A, Aerospatiale Corvette and SIAI-Marchetti S.211. Eventually 2,195 engines of the -4 series were delivered. JT15D-4A JT15D-4B JT15D-4C JT15D-4D JT15D-5 Certified in 1983. The first versions delivered and were used on the Beechjet 400A and Cessna T-47A. Several minor versions were introduced, the -5A for the Cessna Citation V, while the -5B powered the Beechcraft T-1A Jayhawk, the -5C the DASA Ranger 2000 and S-211A. JT15D-5A JT15D-5B JT15D-5C JT15D-5D Certified in 1993, increased thrust again, this time to . The -5D is used on the Cessna UC-35A and Cessna Citation Ultra. JT15D-5F
Applications
Aérospatiale Corvette Alenia Aermacchi M-311 Ball-Bartoe Jetwing Boeing Bird of Prey Beechcraft Beechjet 400 Cessna Citation I Cessna Citation II Cessna Citation V/Ultra EADS Barracuda Hawker 400 Honda MH02 Mitsubishi MU-300 Diamond Northrop Grumman X-47A Pegasus Raytheon T-1 Jayhawk Rockwell Ranger 2000 Scaled Composites 401 Scaled Composites ARES SIAI-Marchetti S.211/Aermacchi S-211 Sport Jet II Stratos 716X
Specifications (JT15D-5D)
Engine Takeoff thrust (kN) Continuous thrust (kN) Length (mm) Fan Diameter(mm) Diameter.(mm) Dry weight (kg) Bypassratio JT15D-1 9.8 9.3 1506 691 223.5 3.3 JT15D-4 11.12 10.56 1600 686 253 2.6 JT15D-4C 11.12 10.56 1600 686 261 2.6 JT15D-5 12.92 1600 287 2 JT15D-5A 12.92 1600 287 2 JT15D-5B 12.92 1600 292 2 JT15D-5C 14.21 1600 302 2 JT15D-5D 13.56 1531 520 686 292.6 3.3 JT15D-5F 12.92 1600 288 2
References
Notes
Bibliography
Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989.
External links
PWC JT15D Product Overview page