Beechcraft, 5-inch T-34 Mentor Patch Aviators! Fly in the Beechcraft T-34 Mentor again with this neat patch representing the factory plate seen on many a T-34 Mentor. PVC with Hook and Loop Backing 5", Glows in the Dark US Naval Aviator Owned Business Officially Licensed by Beechcraft BEECHCRAFT, emblems, logos, and body designs are trademarks of Textron Aviation Inc. and are used under license by Squadron Nostalgia LLC. The Beechcraft T-34 Mentor is an American propeller-driven, single-engined, military trainer aircraft derived from the Beechcraft Model 35 Bonanza. The earlier versions of the T-34, dating from around the late 1940s to the 1950s, were piston-engined. These were eventually succeeded by the upgraded T-34C Turbo-Mentor, powered by a turboprop engine. The T-34 remains in service more than seven decades after it was first designed.