Bill Gunston, Dennis Baldry, Chris Chant, John Stroud, "The Illustrated Encyclopedia of Propeller Airliners"
Publisher: Exeter | 1980 | ISBN: 0896730786 | English | PDF | 264 pages | 30,26 Mb
For the first 30 years of commercial aviation, from 1920 to 1950, all airliners had propellers. Over the next ten years, to 1960,jet airliners slowly and hesitantly penetrated the extremely conservative and ultra-cautious airline industry. But by 1960 the airlines had become so polarized around the jet that efficient and successful turboprop airliners, such as the Electra and Vanguard, lost their builders a lot of money because the customers thought them obsolete. …