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A few of the famous aircraft in that section, notably the immortal DC-3, were still important in the 1940s, which traces the introduction of pressurization, new navigation aids and many other advances, as well as a doubling in engine power from 1000 to 2000 hp and, at the end of that decade, still more powerful engines such as the 3250 to 3500-hp Pratt & Whirney Wasp Major and Wright Turbo-Compound, the latter being·an established piston engine to which were added three turbines driven by the hot exhaust gas.These ultimate piston engines were immense mechanical accomplishments, but they could not survive in the face of competition from jets and turboprops.It is an extraordinary fact that in 1980 not only are hundreds of Dart-powered aircraft still in service but engines almost indistinguishable from the 1953 model are in large-scale production, and selling briskly to new as well as to existing customers.But that does not mean technical development is dormant.This bizarre and isolated journey is generally accepted by philatelists as the world's first aerial post and some actual examples of the postmark still exist.Four days later, a 'regular' sen'icc for the duration of the exhibition was opened by Pcequet and Captain Walter G Windham, the aircraft that they used again being the Humber-Sommer biplane.Though occasionally designers got carried away by their enthusiasm and made aircraft that were too large and failed to sell - examples were the Fokker F.32 and Dornier Do X - the size and capability of airliners grew in step with the traffic.The 1930s saw a never-to-be-repeated transformation from fabric-covered biplanes to stressed-skin monoplanes, equipped with retractable landing gear, flaps, variable-pitch propellers and many other new features.

Back in the 1960s airlines were often embarrassed at· turboprop equipment and tried by various means to convey the impression they operated jets. In 1979-80 the number of completely new jet airliners launched was zero; the number of com pletely new turboprops four.

Therefore, though mainly an account of past history, this volume ends with a buoyant industry that cannot build turboprop airliners fast enough.

Included in this book are early airliners, among which are those that carried the world's very first farepaying passengers, and the first small sack of air-mail letters, long before World War 1.

Contributors: Dennis Baldr)', Chris Cham, John Stroud Color illustralions: John Batchelor, Terry Hadler Line illustrations: Tcrry Allcn Designs Ltd, Ray Hutchins, l'vlanin Woodford, research by Arthur Bowbeer Color realization: Helena Zakrzewska-Rucinska CUlaways: © Pilot Press Ltd Three-view drawings: © Pilot Press Ltd, © Phoebus Publishing Company © 1980 Phoebus Publishing Company/BPC Publishing Limited, 52 Poland Street, London WIA 2JX First published in USA 1980 by Exeter Books Distrib Uled by Bookthrift, Inc .:'Jew York, New York All rights reserved.

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Back in the 1960s airlines were often embarrassed at· turboprop equipment and tried by various means to convey the impression they operated jets. In 1979-80 the number of completely new jet airliners launched was zero; the number of com pletely new turboprops four.

Therefore, though mainly an account of past history, this volume ends with a buoyant industry that cannot build turboprop airliners fast enough.

Included in this book are early airliners, among which are those that carried the world's very first farepaying passengers, and the first small sack of air-mail letters, long before World War 1.

Contributors: Dennis Baldr)', Chris Cham, John Stroud Color illustralions: John Batchelor, Terry Hadler Line illustrations: Tcrry Allcn Designs Ltd, Ray Hutchins, l'vlanin Woodford, research by Arthur Bowbeer Color realization: Helena Zakrzewska-Rucinska CUlaways: © Pilot Press Ltd Three-view drawings: © Pilot Press Ltd, © Phoebus Publishing Company © 1980 Phoebus Publishing Company/BPC Publishing Limited, 52 Poland Street, London WIA 2JX First published in USA 1980 by Exeter Books Distrib Uled by Bookthrift, Inc .:'Jew York, New York All rights reserved.

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Back in the 1960s airlines were often embarrassed at· turboprop equipment and tried by various means to convey the impression they operated jets. In 1979-80 the number of completely new jet airliners launched was zero; the number of com pletely new turboprops four.

Therefore, though mainly an account of past history, this volume ends with a buoyant industry that cannot build turboprop airliners fast enough.

Included in this book are early airliners, among which are those that carried the world's very first farepaying passengers, and the first small sack of air-mail letters, long before World War 1.

Contributors: Dennis Baldr)', Chris Cham, John Stroud Color illustralions: John Batchelor, Terry Hadler Line illustrations: Tcrry Allcn Designs Ltd, Ray Hutchins, l'vlanin Woodford, research by Arthur Bowbeer Color realization: Helena Zakrzewska-Rucinska CUlaways: © Pilot Press Ltd Three-view drawings: © Pilot Press Ltd, © Phoebus Publishing Company © 1980 Phoebus Publishing Company/BPC Publishing Limited, 52 Poland Street, London WIA 2JX First published in USA 1980 by Exeter Books Distrib Uled by Bookthrift, Inc .:'Jew York, New York All rights reserved.

1\0 pan of this p Ublication may be rcproduced, stored in a retrieval system, or transmiued, in any form or by any means, electronic, mechanical, photocopying, recording or otherwisc, without thc prior permission of the copyright owner Phototypcset by Tradespools Limitcd, Frome, Somerset, England Printed in Great Britain by Redwood Burn Limited, Trowbridge, Wiltshire IS81\ 0-89673-078-6 , t e 1 t S c h f S' o SI n a. • Humber-Sommer • FIRST FLIGHT 1910 / • HE place in aviation history of the otherwise unimportant Humber-Sommer .biplane is assured by the fact that it was an aircraft of this type which undertook the world's first carriage of mail by an aircraft.

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Back in the 1960s airlines were often embarrassed at· turboprop equipment and tried by various means to convey the impression they operated jets. In 1979-80 the number of completely new jet airliners launched was zero; the number of com pletely new turboprops four.Therefore, though mainly an account of past history, this volume ends with a buoyant industry that cannot build turboprop airliners fast enough.Included in this book are early airliners, among which are those that carried the world's very first farepaying passengers, and the first small sack of air-mail letters, long before World War 1.Contributors: Dennis Baldr)', Chris Cham, John Stroud Color illustralions: John Batchelor, Terry Hadler Line illustrations: Tcrry Allcn Designs Ltd, Ray Hutchins, l'vlanin Woodford, research by Arthur Bowbeer Color realization: Helena Zakrzewska-Rucinska CUlaways: © Pilot Press Ltd Three-view drawings: © Pilot Press Ltd, © Phoebus Publishing Company © 1980 Phoebus Publishing Company/BPC Publishing Limited, 52 Poland Street, London WIA 2JX First published in USA 1980 by Exeter Books Distrib Uled by Bookthrift, Inc .:'Jew York, New York All rights reserved.1\0 pan of this p Ublication may be rcproduced, stored in a retrieval system, or transmiued, in any form or by any means, electronic, mechanical, photocopying, recording or otherwisc, without thc prior permission of the copyright owner Phototypcset by Tradespools Limitcd, Frome, Somerset, England Printed in Great Britain by Redwood Burn Limited, Trowbridge, Wiltshire IS81\ 0-89673-078-6 , t e 1 t S c h f S' o SI n a. • Humber-Sommer • FIRST FLIGHT 1910 / • HE place in aviation history of the otherwise unimportant Humber-Sommer .biplane is assured by the fact that it was an aircraft of this type which undertook the world's first carriage of mail by an aircraft.

]] pan of this p Ublication may be rcproduced, stored in a retrieval system, or transmiued, in any form or by any means, electronic, mechanical, photocopying, recording or otherwisc, without thc prior permission of the copyright owner Phototypcset by Tradespools Limitcd, Frome, Somerset, England Printed in Great Britain by Redwood Burn Limited, Trowbridge, Wiltshire IS81\ 0-89673-078-6 , t e 1 t S c h f S' o SI n a. • Humber-Sommer • FIRST FLIGHT 1910 / • HE place in aviation history of the otherwise unimportant Humber-Sommer .biplane is assured by the fact that it was an aircraft of this type which undertook the world's first carriage of mail by an aircraft.

pan of this p Ublication may be rcproduced, stored in a retrieval system, or transmiued, in any form or by any means, electronic, mechanical, photocopying, recording or otherwisc, without thc prior permission of the copyright owner Phototypcset by Tradespools Limitcd, Frome, Somerset, England Printed in Great Britain by Redwood Burn Limited, Trowbridge, Wiltshire IS81\ 0-89673-078-6 , t e 1 t S c h f S' o SI n a. • Humber-Sommer • FIRST FLIGHT 1910 / • HE place in aviation history of the otherwise unimportant Humber-Sommer .biplane is assured by the fact that it was an aircraft of this type which undertook the world's first carriage of mail by an aircraft.

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