SAB-SEMA 10
The SAB-SEMA 10 was a single-engine advanced trainer, designed and built in France as the SEMA 10, in the 1930s. It failed to win a French production contract and only one was built. Re-engined, modified and redesignated SAB-SEMA 12, it served with the Spanish Republican Air Force at the beginning of the Spanish Civil War. Design and development The SAB-SEMA 10 was designed by the Societé d'Etudes de Materiel d'Aviation (SEMA) and built by the Société Aérienne Bordelaise (SAB) to compete for a 1933 French government contract for an intermediate and advanced military trainer. It was a conventional biplane, metal framed and fabric covered, powered by a 240 hp (180 kW) Lorraine 7Mc Mizar seven-cylinder radial engine. Instructor and pupil occupied open tandem cockpits. The SAB-SEMA 10 failed to gain a production contract when the competition was won by the Romano R.82. It was then re-engined with a more powerful 300 hp (224 kW) Lorraine 9Na Algol nine-cylinder radial with a Townend ring cowling. At the same time wing and tail modifications were made and the aircraft redesignated the SAB-SEMA 12. This was a single-bay biplane with N-form interplane struts. The lower wing had a smaller chord than the upper