The Air Force recently proved through a series of tests that its KC-135 Stratotanker aircraft can fly more efficiently just by mounting the cockpit window’s wiper blades vertically instead of horizontally. The potential fuel cost savings: about $7 million per year.

Researchers with the Advanced Power and Technology Office, part of the Air Force Research Laboratory, and the Southwest Research Institute, assessed the KC-135 after similar tests were conducted on a commercial McDonnell Douglas MD-11 cargo airliner. The commercial tests showed the new blade direction reduced its flight drag by 1.2%.

“Across the KC-135 fleet, blades are positioned horizontally on the windshield as part of the aircraft’s original 1950s design,” officials said in a news release. “However, as the understanding of aviation aerodynamics advanced, research indicated placing the wipers vertically when not in use could improve aerodynamic efficiency and optimize fuel use”.

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Read more: military.com