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...

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