Original sentence: Of pod-and-boom configuration, it had a low wing, pusher propeller, fixed tricycle undercarriage, and twin tails.The Army ordered the more conventional Taylorcraft D instead.The Arpin A-1 was an unorthodox monoplane aircraft submitted to the British Army for evaluation as an observation aircraft in 1938
Edited sentence: 9R radial immediately behind, with its centre line well above the booms and tailplane.An unconventional fixed tricycle undercarriage was fitted.In 1938 a very unusual McClaren type was fitted.In 1939 the A-1 was re-engined with an inverted inline 90 hp (67 kW) Blackburn Cirrus Minor I, which raised the maximum speed to 115 mph (185 km/h).It was submitted to the British Army for evaluation as an observation aircraft in 1938, but the Army ordered the more conventional Taylorcraft D instead.Only one A-1 was built, with the civil registration G-AFGB.Only one was built.The Arpin A-1 was a low wing monoplane of wooden construction and plywood covered.The Arpin A-1 was a two seat low wing monoplane which was powered by a single radial engine in pusher configuration, mounted behind the cabin between twin booms that carried the tail.The Arpin had a fixed tricycle undercarriage at a time when most aircraft used the tailwheel configuration.The booms were at wing height but the side by side two seat enclosed cabin sat on the wing with the uncowled British Salmson AD.The empennage was carried on a pair of diamond cross section booms mounted on the rear wing spar at the edge of the centre section.The fins were tall, with a slight extension below the boom and carrying unbalanced rudders.The front wheel could be left to caster or could be steered by the pilot.The pusher arrangement and a short nose provided good visibility from the cabin.This allowed all three wheels to be turned parallel to each other but not to the aircraft, so that cross wind landings could be made with the aircraft pointing into wind.With this engine it was known as the Arpin A-1 Mk