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Aerodynamic Drag Reduction of Intercity Buses
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Abstract
An experimental program was conducted to verify the reduction in fuel consumption achievable with aerodynamic improvements to intercity buses. Wind tunnel model tests were used to develop effective aerodynamic improvements and full-scale road tests to validate the results. Greyhound Lines coach models MC-7 and MC-8 were tested with head- and crosswinds. Aerodynamic drag of the MC-7 was reduced 17 percent at zero yaw. Drag of the MC-8 initially was higher; it was reduced 27 percent at zero yaw by the best fairing. Both low-drag configurations were less sensitive to crosswinds than the original models; significant drag reduction was maintained to 15 degrees yaw angle. Fuel consumption measurements made with aerodynamic fairings installed on an MC-7 showed that the low-drag bus used 11.7 percent less fuel at a steady 55 mph. The cost of the full-scale modifications was estimated at $ 1,500 each for a retrofit kit and no added cost to produce on new vehicles. Return on investment for the aerodynamic improvement exceeds 100 percent annually for today's fuel costs.
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Authors
Citation
McDonald, A. and Palmer, G., "Aerodynamic Drag Reduction of Intercity Buses," SAE Technical Paper 801404, 1980, https://doi.org/10.4271/801404.Also In
References
- Hunt G.A. Motor Coach Industries, Inc. Pembina, North Dakota 58271
- Society of Automotive Engineers, Special Publication P-59 “The DOT/SAE Truck and Bus Fuel Economy Measurement Conference Report,” Warrendale, PA Society of Automotive Engineers 1975
- Amy J.B. “Wind Tunnel Investigation of Bus Drag Reduction with Add-On-Aerodynamic Devices,” M.S. Thesis School of Mechanical Engineering, Purdue University West Lafayette, Indiana August 1976
- Carr G.W. “The Aerodynamics of Basic Shapes for Road Vehicles. Part I: Simple Rectangular Bodies,” The Motor Industry Research Association England Report No. 1968/2 November 1967
- Saltzman E.J. Meyer R.R. “Drag Reductions Obtained by Rounding Vertical Corners on a Box-Shaped Ground Vehicle,” NASA TM X-56023 March 1974
- Saltzman E.J. Meyer R.R. Lux D.P. “Drag Reductions Obtained by Modifying a Box-Shaped Ground Vehicle,” NASA TM X-56027 October 1974
- Steers L.L. Montoya L.C. Saltzman E.J. “Aerodynamic Drag Reduction Tests on a Full-Scale Tractor-Trailer Combination and a Representative Box-Shaped Ground Vehicle,” SAE Paper No. 750703 1975
- Lay W.E. “Is 50 mpg Possible with Correct Streamlining? Parts 1 and 2,” SAE Journal 32 4 April 1933 144 156 32 5 May 1933 177 186
- Mair W.A. “Effect of Rear-Mounted Disc on Drag of Blunt-Based Body of Revolution,” The Aeronautical Quarterly XVI, 4 November 1965 350 360
- Draft Recommended Practice and Information Reports “Fuel Economy Measurement Tests for Evaluation of Truck/Bus Aerodynamic Improvement Devices,” Distributed to Members of the DOT/SAE Truck and Bus Fuel Economy Study Advisory Committee and Aerodynamics Subcommittee January 20 1976
- McDonald A.T. Palmer G.M. “Aerodynamic Drag Reduction of Intercity Buses,” Final Report on Contract DOT-TSC-989 U.S. Department of Transportation, Transportation Systems Center Cambridge, Massachusetts
- Walston W.H. Buckley F.T. Marks C.H. “Test Procedures for the Evaluation of Aerodynamic Drag on Full-Scale Vehicles in Windy Environments,” SAE Paper No. 760106 1976
- Stieber J.G. Greyhound Lines, Inc. 901 N. Halsted St., Chicago, IL 60622