03/15/2020. Remarks by Johan Visschedijk: "The well-known aircraft designer and aerospace John Willard Thorp (June 20, 1912 - April 18, 1992) started designing aircraft in 1931, while being an instructor at the Boeing School of Aeronautics at Oakland Airport, Oakland, California.

The T-5, Thorp's fifth design, was based on the Paulic XT3-B, Thorp's third design, developed with assistance of Roy Paulic, another instructor at the school. The T-5 was an all-metal low-wing tandem-seat trainer, fitted with a conventional landing gear. Power plant was a 320 hp Wright R-760 seven-cylinder air-cooled radial engine. Registered to Thorp as NX15542, the aircraft was first flown by Eddie Allen, head of the Research Division of the Boeing company in Seattle.

Subsequently Roy Paulic and students refitted the aircraft with a tricycle landing gear and with a 215 hp Lycoming radial. Redesignated T-6, the aircraft was flown for fifteen to twenty hours, where after the aircraft was dismantled."