Development and Design
A contest was held by the Regia Aeronautica for a light reconnaissance aircraft and a heavier aeroplane. The first should have 350 km/h (190 knots/220 mph) maximum speed, five hours endurance, three machine-guns and a bomblets dispenser, armour, and the capability to operate from improvised airfields. The heavier one should have 325 km/h maximum speed, at least 1,300 km (810 mi) endurance, 7,000 m (22,750 feet) ceiling, climb to 5,000m (16,000) in 19 minutes, three crew, five weapons, high wing and other details.
Limited production of the IMAM Ro.30, an improved Ro.1 with a defensive turret and better engine, resulted. It was rejected by the Regio Esercito and not chosen for production, being only capable of 200 km/h (110 knots), five hours endurance, a climb rate of 4,000 m (13,000 feet) in 20 minutes, and had three weapons.
IMAM did not give up after the modest success of the Ro.30 and so designed a new aircraft, the Ro.37, which first flew in 1933.
This was a biplane aircraft of mixed construction, with two seats, and a 560 hp Fiat A.30 inline engine. It reached 300 km/h (162 knots) and perhaps even more with this engine, the same as that of the Fiat CR.32. The Ro.37 had a 7,000 m ceiling, 3,000 m climb in 11 minutes, over 1,200 km (750 mi) endurance, three machine guns (two in the nose and one dorsal), twelve 15 kg bombs, and good agility. It was similar to the Hawker Hind, rather than a light army aircraft, and its performance was similar to the later Westland Lysander, but the contemporary British design was the Hawker Hector.
The Ro.37 was later fitted with the 600 hp Piaggio P.IX radial engine. The better reliability of this engine was considered more desirable and so this was the main version produced.
Read more about this topic: IMAM Ro.37
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