The IMAM Ro.43 was an Italian reconnaissance single bay seaplane, serving in the Regia Marina between 1935 and 1943. Although produced in quantity, it proved never to be really suitable for its intended role as a spotter plane for warships, and although 105 remained in service when Italy entered World War II, they were already obsolete. The Ro.43 was designed to meet a 1933 requirement of the Regia Marina (or Italian Navy), for a catapult launched reconnaissance aircraft to equip the Maritime Reconnaissance Squadrons operating from its ships. The specifiation called for a speed of 240 km/h (149 mph), with a range of 600 km (370 mi) or an endurance of 5.5 h. Other contenders were the Piaggio P.18 and P.20, CSAMA MF.10, CANT Z.504 and Macchi C.76.
Derived from the Ro.37 Lince reconnaissance aircraft, with the same designer, the Ro.43 first flew in 1934. The plane was built with steel tubes and wood covered by a soft alloy and fabric.[2] It was a two-seat biplane with folding gulled upper and inverse gull lower wings, lightly armed and capable of around 300 km/h (185 mph) and over 1000 km (620 mi) range. This performance more than met the requirements of the specification, and so the seaplane made by IMAM was declared the winner. Despite this, the Ro.43 had serious problems. Its lightweight structure meant that it was too delicate for operations at sea, and it had poor sea-handling qualities. These problems meant that when it was launched it was quite normal not to recover it at sea, forcing the aircraft to return to land before alighting.
After the italian armistice in septembre 1943, the Regia Marina hidros flew to Alcudia, Palma and Pollensa (Mallorca islands), where they were interned by the spanish authorities. These hidros, already old-fashioned when they got to Spain, remained inactive for one year, being acquired them to the new italian authorities. Six units served with the new Air Force, receiving the military codes HR 7-1 to HR 7-6. They were destinated to the hidro base of Mallorca where they remained active until 1951, when they were withdrawn from service.