07/31/2023. Remarks by Johan Visschedijk: "This high performance two-seat aircraft was designed by Ed Swearingen, it was his first light aircraft project, after having been responsible for, amongst other, the Merlin/Metro series. The SX300 (SA-29 designer's designation) was mainly aimed at the homebuilt market for builders requiring a high-performance aircraft and it was marketed, in kit form, by Swearingen Aircraft.
The first aircraft (registered N300SX and designated as SA-29) made the first flight on July 11, 1984 and was powered by a 300 hp Lycoming IO-540-L1C5 engine. The SA-29 prototype was sold to Jaffetech Industries, Inc. in late-1987, to serve as development aircraft for the SA-32T turbine engine derivative. The SA-29 (reregistered N6Y) was lost in a fatal crash on January 9, 1989.
The version marketed for amateur construction was marketed as the SX300, but also carried the designer's designation SA-29. Towards the end of 1989 the SX300 was withdrawn from the market, at which time some ninety kits had been delivered. Most aircraft that were completed had a Lycoming O-540 series engine. After the marketing had stopped, the production rights for the SX300 were transferred to Jaffetech Industries and this company used the SX300 as basis for the SA-32/AT-32 projects. In 1994 the rights/tools were acquired by Airight, Inc. (Jim Ryan), but no further kits were built.
An SX300 established FAI Class C-1c and C-1c world speed records of 313,882 (504.14 kmh) respectively 312,465 mph (502,85 kmh)."
