The Dinfia IA-51 Tehuelche was an Argentine three-seater light aircraft developed from the IA-46 Ranquel in 1962, and first flown in 1963. The IA-51 was a braced high-wing monoplane powered by a Lycoming O-360-A1A four-cylinder horizontally-opposed air-cooled engine providing a top speed of 195 kmh and a range of 780 km. Two versions of the Dinfia IA-51 Tehuelche were produced, a tourer and an agricultural version. Research IA-51
 
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