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Arpin A-1


M.B.Arpin & Co of West Drayton, Britain, started the Arpin A-1, desiged by Morris Arpin, in 1937. A two-seat cabin monoplane powered by a pusher Salmson AD.9R, with MacLaren crosswind tricycle undercarriage.
The Arpin A-1 was of wooden construction and plywood covered. 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 booms were at wing height but the side by side two seat enclosed cabin sat on the wing with the uncowled 68 hp (51 kW) British Salmson AD.9R radial immediately behind, with its centre line well above the booms and tailplane. The pusher arrangement and a short nose provided good visibility from the cabin.
The Arpin had a fixed tricycle undercarriage at a time when most aircraft used the tailwheel configuration. It was the first British aircraft to be designed for tricycle landing gear. In 1938 a very unusual McClaren type was fitted, which 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. The front wheel could be left to caster or could be steered by the pilot.
Only one A-1 was built at the company works at Longford, London, registered G-AFGB cn.1, the only one built first flew at Hanworth Aerodrome on 7 May 1938.
It was converted to Mk.2 in 1939 with a Blackburn Cirrus Minor 1 engine for Army evaluation, delivered in December 1939 to the School of Army Co-operation at Old Sarum, but not adopted. The Cirrus Minor I raised the maximum speed to 115 mph (185 km/h).
The A-1 survived WW2 to be broken up in 1946.
Powerplant: 1 × British Salmson AD.9R, 68 hp (51 kW)
Wingspan: 31 ft 6 in (9.61 m)
Wing area: 165 sq ft (15.3 m2)
Length: 23 ft 2 in (7.06 m)
Height: 7 ft 1 in (2.13 m)
Empty weight: 740 lb (336 kg)
Gross weight: 1,261 lb (573 kg)
Maximum speed: 108 mph (173 km/h, 94 kn)
Cruise speed: 95 mph (153 km/h, 83 kn)
Endurance: 5 hours
Rate of climb: 600 ft/min (3.0 m/s)
Crew: one, pilot
Capacity: one passenger




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