High Quality Content by WIKIPEDIA articles! The Huff-Daland TA-2 was an American biplane trainer designed by the Huff-Daland Aero Corporation in the early 1920s for the United States Army Air Service. It was a development of the HD.4 Midget with a 140 hp ABC Wasp radial engine. Three prototypes (one for static tests and two fliers) were ordered for evaluation at McCook Field. The two flying examples were later rebuilt with a re-designed fuselage, balanced rudder, smaller wings and a 90 hp Curtis OX-5 engine. One aircraft was later re-engined with a Lawrance J-1 radial engine.