One Jupiter-powered aircraft was built, intended to be exported to Romania.

Two aircraft built for the Italian government in 1928.

Three aircraft were built, each with different engine or wing positions, but no production followed.

Based on Model 18-08 fitted for trooping; seven aircraft built.

A military designed aircraft built for silent flying and high stability during abnormal maneuvers.

The "restart" aircraft built after 1996 were different in many other details including a different engine, new seating design, etc.

Eight aircraft were built, four of each type; all were named, with names beginning with the letter "H".

Second aircraft built along the same lines.

Older aircraft built before the mid-1980's provided cabins with 100 percent fresh air that was circulated every three minutes.

Two aircraft built to test barrage balloon cable cutters and deflectors.