03/31/2009. The Calquín was the first twin-engined aircraft designed and built in Argentina. Calquín Project Leader was Brigadier Major Juan Ignacio San Martín, the design team included Ambrosio Taravella, Antonio Sarlich and three Teniente 1o (1st Lieutenants): Alberto Chavéz, Santiago Navarro and Félix Mauricio Fernandéz.
The two-seat aircraft was powered by two 1,050 hp Pratt & Whitney
R-1830-SC-G Twin Wasp fourteen-cylinder two-row air-cooled radial engines. Of all-wood construction the mid-winged aircraft had a likeness to the de Havilland Mosquito. It carried four 0.50 in (12,7 mm) machine guns in the nose, and 800 lb (363 kg) of bombs could be stowed in the internal bomb-bay.
Georg v. Rauch states: "The engine choice was made by Brigadier Major San Martín. It is a fable the British did not want to sell Argentina Rolls-Royce Merlins, but the Twin Wasp was chosen simply because it was cheaper. The Calquín was not a succesful design: it was underpowered and unstable in all three axis. The aircraft was far from popular with its crews, which gave it such derisive sobriquets as 'Widow Maker', and 'Abro Escalafón', which literally means 'I make room in the promotion roster' (by killing crews)."