Jump to ContentJump to Main Navigation
The Simple Physics of Energy Use$
Users without a subscription are not able to see the full content.

Peter Rez

Print publication date: 2017

Print ISBN-13: 9780198802297

Published to Oxford Scholarship Online: December 2017

DOI: 10.1093/oso/9780198802297.001.0001

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (www.oxfordscholarship.com). (c) Copyright Oxford University Press, 2018. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a monograph in OSO for personal use (for details see www.oxfordscholarship.com/page/privacy-policy).date: 21 October 2018

Air Transportation

Air Transportation

Chapter:
(p.152) 10 Air Transportation
Source:
The Simple Physics of Energy Use
Author(s):

Peter Rez

Publisher:
Oxford University Press
DOI:10.1093/oso/9780198802297.003.0011

When an airplane is full, the energy used to travel a given distance compares very favourably with driving an economical car. Primary energy use is less since airplane turbofan engines are more efficient than car engines. Even airplanes with propellers driven by petrol engines are more efficient than cars as the engines are operating at near-peak rpm and producing a higher proportion of the rated power. Air travel uses a lot of energy because it makes travelling long distances easy, even if not very comfortable. The airplane is limited by the weight it can carry, which puts a limit on how tightly the passengers can be squeezed together. Given that drag will always be a factor in high-speed transportation, even for ground transportation, energy use can be minimised by reducing the cross-sectional area and squeezing more people into even smaller spaces, such as in the hyperloop.

Keywords:   parasitic drag, induced drag, propeller, turbofan, turbojet, range, endurance, pressure ratio, turbine inlet temperature, bypass ratio, hyperloop

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .