Lockheed manufactured the first PV-1 Venturas in 1941 for use in England. By mid-1942, half a year after America entered the war, however, the U.S. Navy needed its own land-based heavy bomber ...

the Royal Air Force developed a radar equipped Hudson bomber to seek out German U-boats. These explorations into anti-submarine warfare aircraft led to the Lockheed PV-1 Ventura and PV-2 Harpoon ...