page_title: AN/APQ-13
hierarchical_section_title: AN/APQ-13
caption_attribution_description: English: Fifteen B-29s and one B-29A were adapted for air rescue duty after World War II. Nicknamed "Super Dumbo" and designated SB-29. These aircraft were modified to carry an air-droppable A-3 Edo lifeboat. The primary mission of the SB-29 was rescue support for units flying long distances over water. The "Super Dumbo" retained all the defensive armament of the production bomber with the exception of the forward lower gun turret which was removed to make room for the AN/APQ-13 radome just behind the nose landing gear. When a downed aircrew was spotted in the water, the lifeboat was released from the aircraft. The lifeboat, which descended by parachute, was equipped with watertight compartments, self-righting floatation bladders, an inboard engine, food and water. The SB-29 remained in service throughout the Korean Conflict and into the mid-1950s.
context_page_description: The AN/APQ-13 radar was an American ground scanning radar developed by Bell Laboratories, Western Electric, and MIT as an improved model of the airborne H2X radar, itself developed from the first ground scanning radar, the British H2S radar. It was used on B-29s during World War II in the Pacific theater for high altitude area bombing, search and navigation. Computation for bombing could be performed by an impact predictor. A range unit permitted a high degree of accuracy in locating beacons. The radome was carried on the aircraft belly between the bomb bays and was partially retractable on early models. The radar operated at a frequency of 9375 ± 45 megahertz and used a superheterodyne receiver.
context_section_description: The AN/APQ-13 radar was an American ground scanning radar developed by Bell Laboratories, Western Electric, and MIT as an improved model of the airborne H2X radar, itself developed from the first ground scanning radar, the British H2S radar. It was used on B-29s during World War II in the Pacific theater for high altitude area bombing, search and navigation. Computation for bombing could be performed by an impact predictor. A range unit permitted a high degree of accuracy in locating beacons. The radome was carried on the aircraft belly between the bomb bays and was partially retractable on early models. The radar operated at a frequency of 9375 ± 45 megahertz and used a superheterodyne receiver.
caption: Boeing SB-29 "Super Dumbo" with AN/APQ-13 radome between the nose landing gear and the airborne lifeboat
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