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Modifying the Aerodynamics of Your Road Car


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Table of Contents

Chapter 1 - Theory * Wake drag * Viscous drag * Body pressures causing drag and lift * Interference drag * Attached and separated flows * Reynolds numbers * Trailing vortices * Undercar flows * Drag and lift coefficients * Yaw * Dynamic and static pressures Chapter 2 - Aerodynamic vehicles * Rumpler Tropfenwagen * Opel RAK II winged rocket car * Tatra T87 * Porsche Type 64 * Volkswagen Transporter * NSU Ro80 * Dodge Charger Daytona & Plymouth Roadrunner Superbird * Holden Special Vehicles Group A Commodore * Opel Calibra * General Motors EV1 * General Motors Chevrolet Volt * Volkswagen XL-1 Chapter 3 - Flow visualisation * On-road flow testing * Visualisation techniques * Wool-tufting * Smoke streams * Eroding clay * Dust Chapter 4 - Pressure measurement * Pressure measurement aims * Measuring instruments * Magnehelic gauges * Pressure probes * Measuring pressures with a Magnehelic gauge * Step-by-step pressure measurement * Using pressure measurement data * Using pitot tubes to measure airspeed Chapter 5 - Measuring drag and lift * Measuring drag * Required power testing * Coast-down testing * Fuel economy testing * Measuring lift and downforce on the road Chapter 6 - Reducing drag * Reducing frontal area * Reducing rear vison mirror drag * Reducing cooling drag * Ride height and rake * Reducing the area of the wake * Reducing the strength of the wake * Achieving clean separation * Reducing separation bubbles * Undertrays * Wheels, tyres and wheel arches * Reducing drag - development of a new car Chapter 7 - Reducing lift and improving stability * Causes of lift * Stability * Determining the centre of pressure and centre of gravity * Lateral forces * Undertrays and diffusers * Spoilers * Wings * Reducing trailing vortices * Active aerodynamics Chapter 8 - Improving flow through heat exchangers * Pressure differentials * Improving underbonnet intercooler airflow * Testing a diesel intercooler * Designing and installing an alternator cooling duct * Turning vanes * Bonnet (hood) vents and ducts Chapter 9 - Engine intakes * Benefits * Measuring pressures * Measuring engine intakes * Building a new engine intake Chapter 10 - Reducing aerodynamic noise * Causes of aerodynamic noise * Testing and measurement * Decreasing noise production * Decreasing noise transmission * Modifications to reduce noise

About the Author

Author Julian Edgar has worked as a teacher, writer, editor and photographer. He edited a national Australian automotive print magazine before working at an on-line car magazine for 18 years, and has contributed articles to automotive publications in the UK, US and Australia. This is his 22nd book. Julian is a hands-on modifier who performs all work on his cars himself in his home workshop, where he has been making aerodynamic modifications to his own road cars for more than 25 years. His main automotive interests are suspension, engine management and aerodynamics. -- Technical consultant Richard Barnard is a world-renowned aerodynamicist. He started his career as an undergraduate aeronautical engineering apprentice at Handley Page Ltd, and later became Principal Lecturer and Postgraduate Research Tutor at the University of Hertfordshire, and is currently a Visiting Research Fellow. He is also a founder member of the UK Wind Engineering Society, and a Fellow of the Royal Aeronautical Society (FRAeS). He has been a consultant for numerous companies, including Jaguar and Rolls-Royce Bentley. Richard is the author of Road Vehicle Aerodynamics and has written many technical papers.


A great read for anyone interest in car aerodynamics. tkc (Totalkitcarhttp:/)this is a great practical guide to road car aerodynamics, simply explained, and backed up with plenty of references to industry sources and papers for those who want to find out more. www.silhouet.com. a fascinating book Iain P W Robertson - Freelance

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