Stockton Field Aviation Museum's newly restored Harpoon.
The PV-2 Harpoon was a major redesign of the Ventura with the wing area increased from 551 ft² (51.2 m²) to 686 ft² (63.7 m²) giving an increased load-carrying capability. The motivation for redesign was weaknesses in the PV-1, since it had shown to have poor-quality takeoffs when carrying a full load of fuel. On the PV-2, the armament became standardised at five forward-firing machine guns. Many early PV-1s had a bombardier's position, which was deleted in the PV-2. Some other significant developments included the increase of the bombload by 30% to 4,000 lb (1,800 kg), and the ability to carry eight 5-inch (127 mm) HVAR rockets under the wings.
While the PV-2 was expected to have increased range and better takeoff, the anticipated speed statistics were projected lower than those of the PV-1, due to the use of the same engines but an increase in weight. The Navy ordered 500 examples, designating them with the popular name Harpoon.
Stockton Field Aviation Museum
Canadian Aviation Blog
Photo Source: Roger Cain