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?
Don R. Berlin Donovan Reese Berlin (June 13, 1898 – May 17, 1982) was an American military aircraft designer and aircraft industry executive. Among the many designs with which he is associated, are the Curtiss P-36 Hawk, Curtiss P-40 Warhawk and Fisher P-75 Eagle. His name is "synonymous with the development of military aviation". He designed aircraft that were safe, rugged and "a pilot's joy."
Albatros D.X The Albatros D.X was a German prototype single-seat fighter biplane developed in 1918 in parallel with the Albatros D.IX. It used the same slab-sided and flat-bottomed fuselage as the D.IX, which was a departure from previous Albatros designs, but was powered by a 145 kW (195 hp) Benz Bz.IIIbo water-cooled V8 engine in place of the D.IX's Mercedes D.IIIa straight-six.