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The Pratt & Whitney GG4 and FT4 are related aero-derivative gas turbine engines developed from the Pratt & Whitney J75/JT4 turbojet line.

References

Harper, R.E. (16 December 1968). Vibration and Noise Characteristics of an Aircraft-Type Gas Turbine Used in a Marine Propulsion System (PDF). Turbo Expo: Power for Land, Sea, and Air. The American Society of Mechanical Engineers. p. 2.
Goodwine, J.K.; Stradley, R.C. (1974). "Maintenance Considerations in Aircraft-Derivative Industrial Gas Turbines". SAE Technical Paper Series. 1. doi:10.4271/740847.

v t e Pratt & Whitney aircraft engines
Radial engines	R-985 R-1340 R-1535 R-1690 R-1830 R-1860 R-2000 R-2060 R-2180-A R-2180-E R-2270 R-2800 R-4360 Double Wasp Hornet (A) Hornet B Twin Hornet Twin Wasp (R-1830) Twin Wasp (R-2000) Twin Wasp E Twin Wasp Junior Wasp series Wasp Wasp Junior Wasp Major Yellow Jacket
H piston engines	X-1800/XH-2600 XH-3130 (XH-3730)
Free-piston gas turbines	PT1
Turbojets	JT3C JT4A JT6 JT7 JT8A JT9 JT11 JT12 J42 J48 J52 J57 J58 J60 J75 J91
Turbofans	GP7000† JT3D JT4D JT8D JT9D JTF10 JTF10A JT10D JTF14 JTF16 JTF17 JTF22 PW1000G PW1120 PW2000 PW4000 PW5000 PW6000 RTF-180† STF200 SuperFan† V2500† F100 F105 F117 F119 F135 F401 RM8† TF30 TF33 XA101 XA103
Turboprops/Turboshafts	APW34† JFTD12 PT2 PT3 PT4 PT5 T34 XT45 T52 XT57 T73 T800-APW† T900†
Propfans	578-DX†
Rocket engines	RL10 XLR-129
Aeroderivative gas turbine engines	GG3/FT3 GG4/FT4 FT8
Subsidiaries	Pratt & Whitney Canada Pratt & Whitney Rocketdyne
Key people	Leonard S. Hobbs George J. Mead Wright Parkins Perry Pratt Frederick Rentschler Richard "Dick" Soderberg Andrew Willgoos
† Joint development aeroengines See also: Pratt & Whitney Canada aeroengines

v t e Aero-derivative engines by manufacturer
General Electric	LM500 LM1500 LM1600 LM2500 LM6000 LMS100
Pratt & Whitney	GG4
Rolls-Royce	Avon Marine Spey Meteor Meteorite MT30