U.S. Air Force Installs ‘Delta Fins’ On C-21s To Counter Dutch Roll

Master Sgt. Jonathon Tolbert, with the 375th Operations Group, points out newly installed fins on the C-21A.
Credit: U.S. Air Force
The U.S. Air Force in late November announced the re-entry into service of the USAF’s first C-21A (Learjet 35A) transport with an aft-fuselage fin modification designed to improve directional stability. The Air Force said it ordered the Delta Fins modification after an undisclosed number of its twin...
Bill Carey

Bill covers business aviation and advanced air mobility for Aviation Week Network. A former newspaper reporter, he has also covered the airline industry, military aviation, commercial space and unmanned aircraft systems. He is the author of 'Enter The Drones, The FAA and UAVs in America,' published in 2016.

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