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The 707 was based on the 367-80 "Dash 80" N708PA, the first Boeing 707 built. (1957) During and after World War II, Boeing was known for its military aircraft. The company had produced innovative and important bombers, from the B-17 Flying Fortress and B-29 Superfortress to the jet-powered B-47 Stratojet and B-52 Stratofortress, but its commercial aircraft were not as successful as those from ...
The fuel economy in aircraft is the measure of the transport energy ... using fuel-inefficient Boeing 747-400s with a low density of 0.75 seat/m 2 due to a high ...
Consequently, it was only natural for Boeing to choose the J57 civil variant, the JT3C, for their 707 jetliner. Douglas did likewise with their DC-8. Pressure to reduce jet noise and specific fuel consumption later resulted in P&W using an innovative modification to convert the JT3C turbojet into the JT3D two spool turbofan, initially for civil ...
In 1959, important orders for the engine were the Boeing 707-120B and Boeing 720B when American Airlines ordered one 707 powered by JT3D turbofans and KLM ordered a JT3D-powered Douglas DC-8. Earlier 707s and DC-8s had been powered by the JT3C and JT4A turbojets, and the improved efficiency of the turbofan soon attracted the airlines. A JT3D ...
The Pratt & Whitney JT8D is a low-bypass (0.96 to 1) turbofan engine introduced by Pratt & Whitney in February 1963 with the inaugural flight of the Boeing 727.It was a modification of the Pratt & Whitney J52 turbojet engine which powered the US Navy A-6 Intruder and A-4 Skyhawk attack aircraft.
Before the arrival of the Pratt & Whitney JT3D turbofan engine, the JT4A was used to power certain Boeing 707 and Douglas DC-8 models, bringing improved field performance in the medium-range Boeing 707-220 and Douglas DC-8-20, and intercontinental range in the Boeing 707-320 and the Douglas DC-8-30.
Douglas Dorsey worked on the shop floor at Boeing as an engineer for over 30 years. He said problems began in the late 1990s during a merger.
The 880's five-abreast seating made it unattractive to airlines, while Boeing was able to outcompete it with the Boeing 720, which could be sold at a significantly lower price, as it was a minimal modification of the existing 707. In addition, the General Electric engines had a higher specific fuel consumption than the Boeing's Pratt & Whitney ...