Whereas the A-28 series of Hudsons were powered by Pratt & Whitney engines, the A-29 series were powered by 1200-hp Wright R-1820-27 nine-cylinder air-cooled engines. The A-29-LOs were similar to the Hudson MK.III(LR) and were designated Hudson Mk.IIIAs in Commonwealth service. They were initially ordered by the RAF under serials BW361/BW766, BW768/BW777, and FH167/FH366. Upon the advent of Lend-Lease, these planes were assigned the USAAAF serials 41-23223/23628 (c/n 414-5988/6029), 41-23265 (c/n 414-6082/6445), 41-23630/23639 (c/n 414-6447/6456), and 41-36968/37167 (c/n 414-6457/6656) and redesignated A-29-LO.
The first 20 aircraft on the contract (BW361/BW380) were diverted to the US Navy as PBO-1s (BuNos 03842/03861). The remainder were delivered to the RAF and RCAF (32 and 133 aircraft respectively, with their original British serials), the RAAF (41 aircraft within serial range up to A16-247), the RNZAF (12 aircraft BW756/BW767 within the serial range up to NZ2094), the Chinese Air Force (23 aircraft, formerly BW386/BW398), and the USAAF (153 aircraft--formerly BW461/BW613--with a flexible 0.50-inch machine gun in an open dorsal position in place of the Boulton Paul turret).
Engines: Two Wright R-1820-87 air-cooled radial engines, rated at 1200 hp for takeoff and 1000 hp at 14,200 feet. Performance: Maximum speed 253 mph at 15,000 feet, cruising speed 205 mph. Landing speed 68 mph An altitude of 10,000 feet could be attained in 6.3 minutes. Service ceiling 26,500 feet. Range 1550 miles with 1400 pounds of bombs, 2800 miles maximum. Weights: 12,825 pounds empty, 20,500 pounds gross, 21,300 pounds maximum. Dimensions: Wingspan 65 feet 6 inches, length 44 feet 4 inches, height 11 feet 10 inches, wing area 551 square feet. Armament: Two fixed, forward-firing 0.303-inch Browning machine guns mounted in the nose above the bombardier-s windows plus two 0.303-inch machine guns in a dorsal Boulton Paul power turret. Four 250-pound bombs or ten 100-pound bombs could be carried in an internal bomb bay.