Percival H. Spencer's original Spencer Amphibian Air Car was bought by Republic Aviation and developed into the SeaBee. In 1968, Spencer developed a four place homebuilt again called the Spencer Amphibian Air Car. In 1980, the two seat S-14 Junior program began, with first flight November 4, 1983 (with 86 year old P. H. Spencer at the controls). Even with modifications, the design did not meet expectations and the program was terminated in 1984. This sole S-14 was donated to the EAA Museum.