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Scale: 1/144
 
Recommended to help build a JT3C-powered Boeing 720 airliner from:
Roden 1/144 scale Boeing 720
Welsh Models 1/144 scale Boeing 720B
and more!
 
This set of 4 models represents the Pratt & Whitney JT3C axial-flow turboject engines fit to early Boeing 707, Boeing 720 and Douglas DC-8 airliners.  The JT3C saw extensive service in airlines for many decades.
 
This set of 4 engine models includes pylons appropriate for Boeing 720 models.  The two inner engine pod pylons (engines 2 and 3) include conspicuous engine-driven turbocompressor inlets and humps over the main engine inlet.
 
The Boeing 720 used two engine-driven turbocompressors to supply high-pressure air for cabin pressurization.  The small air inlets and associated humps are visible on the pylons above the main engine inlets of engines  2 and 3.  The outer port and starboard engine pod pylons (engines 1 and 4) do not have a cabin pressurization compressor inlet.
 
The JT3C turbojet is the civil variant of the J57 engine used in military aircraft such as the early B-52 Stratofortress, B-57 Canberra, C-135 Stratolifter, KC-135 Stratotanker, F4D Skyray, F-8 Crusader, F-100 Super Sabre, F-101 Voodoo, F-102 Delta Dagger, A3D Skywarrior, etc..  The JT3C engine was very loud. To help reduce sound, the JT3C turbojet engine was further developed into the JT3D turbofan.
 
A set of JT3C engines for Boeing 707 and another set without pylons, suitable for Douglas DC-8 models, will be made available separately.
 
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