The Ball S-T two-place open cockpit biplane was built by Clifford Ball, Bettis Field, McKeesport PA., in 1928.
Only one was built, registered N826E c/n 1, it was sold on 3 November 1930 to Pennsylvania Air Lines as a student trainer. The registration expired on 5 December 1932.
Engine: Velie M-5, later Lambert
Seats: 2






