A developments of the Fairchild M-62s appeared in the 1960s, the Funk F-23 built at Broken Arrow in Oklahoma and first flown in 1962. Eleven production aircraft were built around the PT-19 fuselage and powered by the 240-hp W-670M Continental. A further three were built with 275-hp R-755 Jacobs engines.
In May 1970 Cosmic Aircraft Corp acquired all rights in manufacture of F-23 single-seat agricultural monoplane, produced previously by D. D. Funk Aviation Company Inc. Two models: F-23A (Continental radial) and F-23B (Jabobs radial). Production ceased 1975.