Spain. Hispano Aviación HA-100 Triana
In 1951 the Hispano Aviación Company signed an agreement with Dr. Willy Messerschmitt to develop a propeller trainer (Ha-100), a jet trainer (HA-200) and a supersonic fighter (HA-300). Only the HA-200 Saeta would be mass-produced. The HA-100 Triana (Triana is a popular quarter of Seville) was similar to the North American T-28 Trojan (although smaller). It was to be produced in a basic teaching version, with a low-powered Beta engine, and an advanced version with a powerful Sirio engine. In addition, he had to be able to perform combat missions. Two prototypes were built, with Spanish Beta engine (HA-100.E1) and American Cyclone engine (HA-100.F1) as the Sirio was not ready. They both carried weapons in demonstrations. Initially they had a four-bladed propeller which was replaced by a three-bladed propeller. The Triana was successful, but when the US AT-6 Texan aircraft were received, the program was cancelled. A series of 50 units had been started but were scrapped and the components reused for the jet HA-200 Saeta.
The HA-100, due to its shape with conical fuselaje and radial motor, was nicknamed "carrot".