Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Allison V-1710, Allison T40, Allison J33, Allison Model 250, Allison J35, Allison V-3420, Allison T56, Allison T38, Allison J71, Rolls-Royce J102. Excerpt: J33 The General Electric/Allison J33 was a US-produced development of Frank Whittle 's early Rolls-Royce Derwent, enlarged to produce dramatically more thrust, starting at 4,000 lbf (18 kN) and ending at 4,600 lbf (20 kN) with an additional low-altitude boost to 5,400 lbf (24,000 N) with water-alcohol injection. Development The J33 was originally developed by General Electric as part of their work with Whittle's designs during World War II. Their first engine was known as the I-A, but after minor changes to adapt it to US production, it started limited production as the I-16 in 1942, the 16 referring to its 1,600 lbf (7,100 N) thrust. Full production started as the J31 when the United States Army Air Forces introduced common naming for all their engine projects. Along with the I-16, GE also started work on an enlarged version, known as the I-40. As the name implied, the engine was designed to provide 4,000 lbf (18 kN). The development cycle was remarkably rapid. Design work started in mid-1943 and the first prototype underwent static testing on January 13, 1944. Stanley Hooker of Rolls was shown the I-40 in 1943 and was startled at how much progress they had made so quickly, and returned to England to quickly design an even larger design, the 5,000 lbf (22 kN) Rolls-Royce Nene. Lockheed was in the midst of the XP-80 project at the time, originally intending to power their design with a US-produced version of the Halford H-1 of about 3,000 lbf (13 kN). Production of the H-1 ran into delays, and since the I-40 would dramatically improve performance, plans were made to fit the prototypes with the I-40 instead. The
| | Allison Aircraft Engines: Allison V-1710, Allison T40, Allison J33, Allison Model 250, Allison J35, Allison V-3420, Allison T56, Allison T38 |  | 11.12 |  |