page_title: Allison J35
section_title: Design and development
hierarchical_section_title: Allison J35 / Design and development
caption_attribution_description: English: A cutaway view of the dome portion of the J-35-A-4 combustor. Taken from the display at the Southern Museum of Flight.
context_page_description: The General Electric/Allison J35 was originally developed by General Electric in parallel with the Whittle-based centrifugal-flow J33, and was the United States Air Force's first axial-flow compressor engine. The J35 was fairly simple, consisting of an eleven-stage axial-flow compressor and a single-stage turbine. With the afterburner, which most models carried, it produced a thrust of 7,400 lbf.
  Like the J33, the design of the J35 originated at General Electric, but major production was by the Allison Engine Company.
context_section_description: While developing the T31 axial turboprop in 1943 GE realized that they had the resources to design an axial turbojet at the same time as their centrifugal J33 engine. They recognized the axial would have more potential for the future and went ahead with the TG-180 engine. GE axial compressor designs were developed from the NACA 8-stage compressor.
  The engine had its starter and accessories (fuel control, fuel pump, oil pumps, hydraulic pump, RPM generator) mounted in the center of the compressor inlet. This accessory layout, as used on centrifugal engines, restricted the area available for compressor inlet air. It was carried over to the J47 but revised (relocated to an external gearbox) on the J73 when a 50% increase in airflow was required. It also had an inlet debris guard which was common on early jet engines.
  GE developed a variable afterburner for the engine, although electronic control linked with engine controls had to wait until the J47. Marrett describes one of the consequences if the link is human on an afterburning engine. If the afterburner lit but the nozzle didn't open (not noticed by the pilot) the RPM governor would overfuel the engine until the turbine failed.
caption: Cutaway of J35 combustor dome
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