[1] Luigi Teichfuss saw the advantages of ab initio dual control training early in the 1930s and began the design of his LT.12 in 1932.
[2] The LT.12 was a braced high-wing monoplane, with a wing that was rectangular in plan out to very near the blunt tips where the chord reduced slightly.
The wing was held high over the fuselage on two plywood covered pillars like a cut-away pedestal, forward and aft of the rear, underwing, open cockpit.
The fuselage was a deep sided, almost rectangular hexagonal, plywood skinned wooden structure which tapered to the tail.
The small fin was triangular, carrying a broad balanced rudder which moved in an elevator cut-out.