When was the American single-engined, single-seat, all-metal fighter and ground-attack aircraft first flew in which design Donovan Reese Berlin was associated?
Curtiss P-40 Warhawk The Curtiss P-40 Warhawk is an American single-engined, single-seat, all-metal fighter and ground-attack aircraft that first flew in 1938. The P-40 design was a modification of the previous Curtiss P-36 Hawk which reduced development time and enabled a rapid entry into production and operational service. The Warhawk was used by most Allied powers during World War II, and remained in frontline service until the end of the war. It was the third most-produced American fighter, after the P-51 and P-47; by November 1944, when production of the P-40 ceased, 13,738 had been built, all at Curtiss-Wright Corporation's main production facilities at Buffalo, New York.
Fiat G.50 The Fiat G.50 "Freccia" ("Arrow") was a World War II Italian fighter aircraft. First flown in February 1937, the G.50 was Italy’s first single-seat, all-metal monoplane with an enclosed cockpit and retractable undercarriage to go into production. In early 1938, the "Freccias" served in the "Regia Aeronautica" (the Italian Air Force), and with its expeditionary arm, the "Aviazione Legionaria", in Spain, where they proved to be fast and, as with most Italian designs, very manoeuvrable. However, it had inadequate weaponry (two Breda-SAFAT 12.7-mm machine guns). The Fiat G.50 was also used in small numbers by the Croatian Air Force and 35 were shipped to Finland, where they served with distinction, with an unprecedented kill/loss ratio of 33/1.