General Electric T64

The General Electric T64 is a free-turbine turboshaft engine that was originally developed for use on helicopters, but which was later used on fixed-wing aircraft as well. General Electric introduced the engine in 1964. The original engine design included technical innovations such as corrosion resistant and high-temperature coatings. The engine features a high overall pressure ratio, yielding a low specific fuel consumption for its time. Although the compressor is all-axial, like the earlier General Electric T58, the power turbine shaft is coaxial with the HP shaft and delivers power to the front of the engine, not rearwards. Fourteen compressor stages are required to deliver the required overall pressure ratio. Compressor handling is facilitated by 4 rows of variable stators. Unlike the T58, the power turbine has 2 stages.

Later versions of the engine produce from 3,925 to 4,750 shp.

The engine was designed to accommodate different gearboxes or shaft drives, for helicopter or turboprop fixed-wing applications. The engine could be operated continuously at angles between 100 degrees upward and 45 degrees downward for STOL or helicopter applications.

Variants
''Data from: Vectorsite;Sikorsky Giant Helicopters • ;T64-GE-1: 3,080 hp

• ;T64-GE-2: Turbo-shaft: 2,810 hp at 5,200 rpm output

• ;T64-GE-3:

• ;T64-GE-4: Turbo-prop, reduction gearbox below centre-line, airscrew brake and bolt-on control unit: 2,850 hp at 1,160 propeller rpm.

• ;YT64-GE-6: 2,850 hp used for Hughes XV-9 hot-cycle hot cycle rotor drive research helicopter.

• ;T64-GE-6: Turbo-shaft: 2,850 hp at 13,600 engine rpm.

• ;T64-GE-7: 3,925 hp

• ;T64-GE-7A: 3,936 hp

• ;T64-GE-8: Turbo-prop, reduction gearbox above centerline, airscrew brake and bolt-on control unit: 2,850 hp at 1,160 propeller rpm.

• ;T64-GE-10: 2,970 hp

• ;T64-GE-16: 3,485 hp

• ;T64-GE-100: 4,330 hp

• ;T64-GE-412: 3,695 hp

• ;T64-GE-413: 3,925 hp

• ;T64-GE-413A: 3,936 hp

• ;T64-GE-415: 4,380 hp

• ;T64-GE-416: 4,380 hp - three on Sikorsky CH-53E Super Stallion

• ;T64-GE-419: 4,750 hp engine to power the Bell V-280 Valor demonstrator tiltrotor aircraft

• ;T64-GE-423: 3,925 hp

• ;T64-BS-12:

• ;T63-BS-16:

• ;T64-P4D: Turboprop 3,400 hp

• ;CT64-820-1: 2,850 hp

• ;CT64-820-2:

• ;CT64-820-3: 3,130 hp

• ;CT64-820-4: 3,133 hp

• ;T64/P4D: 3,400 hp

• ;Ishikawajima-Harima T64-IHI-10: For Kawasaki P-2J and Shin Meiwa PS-X

Applications
• Aeritalia G.222

• de Havilland Canada DHC-5 Buffalo

• Lockheed AH-56 Cheyenne

• Kawasaki P-2J

• LTV XC-142

• ShinMaywa US-1

• NAMC YS-11E

• Sikorsky CH-53 Sea Stallion

• Sikorsky CH-53E Super Stallion

• Sikorsky HH-53/MH-53