Range & Endurance: Fuel-Efficient Flying in Light Aircraft
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Range & Endurance - Frank Hitchens
Title page
Range & Endurance
Frank Hitchens
Publisher information
First published in 2007 by
Airlife Publishing, an imprint of
The Crowood Press Ltd
Ramsbury, Marlborough
Wiltshire SN8 2HR
www.crowood.com
2015 digital version by Andrews UK Limited
www.andrewsuk.com
© 2007, 2015 Frank Hitchens
All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publishers.
Edited and designed by Ian Penberthy
Introduction
On 14 December 1986, Dick Rutan and Jeanne Yeager left Edwards Air Force base, in California, in their purpose-built aircraft, Voyager, on the first around-the-world, non-stop, unrefuelled flight. They covered a total distance of 25,012 statute miles in 216 hours, 3 minutes and 44 seconds – truly a flight of great range and endurance. Their names and achievement will stand forever in the annals of aviation history, alongside those of John Alcock and Arthur Brown, Charles Lindbergh, Wiley Post and many others.
For the average light aircraft pilot, flights of up to 350 nautical miles or about three hours duration are more the norm. Nevertheless, flying for range and endurance is no less important. In these days of ever rising fuel prices, getting the best range per gallon requires flying the aircraft as efficiently as possible with regard to wind velocity, altitude, power settings, aircraft weight and choice of route. Fuel management before and during flight, and making precise calculations of fuel consumption are just as important. To this end, a complete knowledge of the aircraft’s fuel system and correct leaning schedule is essential to achieve safe, fuel-efficient flight.
Mismanagement of any part of the fuel system can, and does, lead to unnecessary emergencies. Every year, aircraft are landed short of their destinations due to fuel mismanagement problems. Some experience in-flight engine failures during the cruise, leading to forced landings. In such situations, many pilots achieve safe landings, while others damage the aircraft and cause injury, or even death, to the aircraft’s occupants. Subsequently, some of these aircraft are discovered to be completely out of fuel, while others still have sufficient fuel in another tank that would have allowed a safe continuation to the destination. Any small error or omission when handling the fuel system can result in an engine failure, which, if not corrected quickly, can result in a forced landing. This can happen to any of us, at any time. In the USA, statistics indicate that 9–12 per cent of all accidents are related to fuel mismanagement problems. Over half of these accidents are caused by fuel exhaustion due to faulty flight planning and/or handling of the fuel system. This means that fuel mismanagement accidents are on a par with those caused by stalls, during take-off, climb and descent, and by mechanical problems. It only takes a small amount of common sense to avoid a fuel problem. My hope is that this book will make you aware of the pitfalls and help prevent you from becoming a statistic due to fuel mismanagement.
I speak from experience, as I have been responsible for a fuel mismanagement problem while flying a single-engine aircraft. It occurred at an airport with an over-water approach path. My fellow pilot, who was flying the approach, was not too familiar with the type of aircraft or with the airport where we were about to land. I suggested that he slow down to approach speed to allow a departing aircraft time to get airborne. The engine rpm reduced as he throttled back, and then he announced that we were losing power. There was no response from the engine as he pushed the throttle fully forward. My first real engine failure! We were still over water at 1,000ft with about two miles to run to reach the airport; no chance of a ‘dead stick’ landing there. Half-way through the engine failure check-list, to our surprise, the engine suddenly burst back into life at full power, the throttle being still fully forward. We continued on to make a normal landing on the runway. Fuel mismanagement was the cause of the problem. Instead of applying carburettor heat before reducing power, the pilot had pulled the mixture control to ‘idle cut-off’, starving the engine of fuel!
It is not only pilots of light aircraft who experience fuel related problems; professional pilots are also guilty of causing them! The crew of one airliner inadvertently turned off the fuel to both engines just after take-off. Luckily, they discovered their error before it was too late. An Air Canada Boeing 767, on a flight from Montreal to Edmonton, landed short of its destination on a small airstrip at Gimla, Manitoba. Faulty fuel gauges and an error in converting between litres and US gallons by both refuellers and flight crew had resulted in only half the required fuel being loaded on board the aircraft before flight! Fortunately, the powerless landing at Gimla resulted in only minor airframe damage and no injury to the occupants. In 1980, a Vickers Viscount landed in a paddock in Devon following fuel starvation, which resulted in a few injuries. Other airline crews have experienced similar problems with less favourable results.
Flying for range and endurance is not simply a matter of ‘going the distance’ or using the aircraft and fuel efficiently; it also involves the correct and common-sense handling of the fuel system. Mismanaging the fuel system, as the incidents described previously show, can quickly terminate the flight well short of its true range and endurance.
I have written this book mainly with the private pilot and new commercial pilot in mind, flying light single- and twin-engined aircraft. Pilots with greater experience may also benefit from reading it, however, using it as a refresher on range and endurance flying. It starts with a brief look at fuel technology, followed by a consideration of different fuel leaning procedures. Next, aircraft fuel systems are covered, followed by the practical aspects and theory of fuel management. Then comes the all-important aspect of pre-flight planning, after which range and endurance are discussed from an aerodynamic point of view. Finally, it concludes with a selection of formulas for solving fuel calculation problems on the E6-B air navigation computer.
As the pilot in command, you should be familiar with, and use, the flight manual or pilot’s operating handbook (POH) for the aircraft you fly. This point cannot be overemphasized, as the flight manual is the number-one publication for your aircraft and its systems. Once you have an understanding of the manual and the operation of your aircraft’s fuel system, and have read this book, you should be able to conduct every flight professionally with regard to flying for range and endurance. An important aspect of good airmanship is being able to conduct each flight to its safe termination, using fuel economically and arriving with sufficient reserve in the tanks. I hope that this book will help you to achieve the objective of safe and fuel efficient flight.
In conclusion, I would like to thank my good friend Nathan Bullmore for his assistance in scanning the diagrams and photographs for this book. Also, I would like to thank Wellington Aero Club instructor Nicolla Wall for the assistance she gave me when I photographed the club’s Piper Tomahawk being refuelled. Their help is greatly appreciated. All the photographs in this book are from the my own collection.
Fly safely with knowledge.
Frank Hitchens
Wellington, New Zealand
2007
Chapter 1: Fuel Technology
One of the biggest expenses of operating an aircraft, whether a light single or a heavy jet transport, is the cost of fuel. Running an aircraft economically and getting the most range from a given quantity of fuel requires an excellent knowledge of the aircraft’s fuel system, leaning techniques and fuel management, both before and in flight. It also helps to have a general appreciation of the fuel’s limitations and abilities. Therefore, I’ll begin this study of flying for range and endurance with a brief look at fuel technology.
Crude petroleum oil is one of the world’s natural resources, having been formed many millions of years ago from decaying plant and animal matter. It was eventually discovered by geologists deep beneath the earth’s surface in various parts of the world. The location of an oil field determines the crude oil’s chemical composition, its physical properties and its quality, which can vary from place to place. The oil refining industry had its beginnings when James Williams opened the world’s first oil refinery in Canada in 1857. In 1859, at Titusville, Pennsylvania, E.l. Drake drilled the first well specifically for the purpose of obtaining oil. Samuel Van Sickyl further developed the multi-step refining process, in common use today, in 1877 in the USA.
The process of refining crude oil into petroleum is complex, and a complete explanation is beyond the scope of this book. However, it is worth having a brief look at the basic steps before studying the fuel’s different characteristics.
Crude oil passes through three basic refining processes to become its finished products. In the first process of distillation, it is heated in a ‘still’. As the temperature of the crude oil rises, petrol (or Avgas) boils off at around 200°C (392°F). This is followed by kerosene, diesel oil and turbine fuel, which evaporates at 180–345°C (356–653°F). Other by-products, known collectively as ‘fractions’, vaporize at different temperatures. The fractions are allowed to cool and condense into liquids, or distillates, for further refining. The lighter elements (iso-butane is the lightest) boil off at lower temperatures, while the heavier elements (naphthalene is the heaviest) become gases at higher temperatures. Treating and blending are also parts of the first stage, which isolates the various products. The second stage of the refining process is known as ‘cracking’. This causes the various chemical compounds to condense. The third process involves ‘reforming’, or producing the final products.
Petroleum oil consists of 50–98 per cent hydrocarbons, the remaining constituents being