By David McBride
Director, NASA DrydenFlight Research Center
Over the last severalmonths, I have read many news stories and web accounts about rising and falling fuel pricesand how some companies are rediscovering efficiencies by making trucks more aerodynamically efficient. These makeme smile as it reminds me of the early aerodynamic truck studies conductedalmost 40 years ago at NASA’s Dryden Flight Research Center on Edwards AirForce Base. Fuel efficiency in long haul trucks was never much of an issueuntil the first peacetime gas crisis, in the early 1970s. In 1973 anaeronautical engineer at NASA Dryden began musing over ways to cut theaerodynamic drag of over-the-road trucks. He led a small team of researcherswhose results had an extraordinary, if little recognized, impact.
The center’s firstexperiment involved a passenger van modified into a driving laboratory. Weattached an aluminum rectangular box to the vehicle—hence the nicknameShoebox—and over successive experiments, changed elements of the box.We rounded the vertical and horizontal corners, sealed the entireunderbody including the wheel wells, and even added a “boat tail” tothe rear of the vehicle, finding out what benefits each had on the overallaerodynamic drag. Road tests of the Shoebox, with rounded vertical andhorizontal corners front and back, lowered the vehicle’s ...