The A-3 lifeboat was an airborne lifeboat developed by the EDO Corporation in 1947 for the United States Air Force (USAF) as a successor to the Higgins Industries A-1 lifeboat. The A-3 lifeboat was a key element of "Dumbo" rescue flights of the 1950s.
EDO built the lifeboat of aluminum alloy to be carried by the SB-29 Super Dumbo performing air-sea rescue duties during the Korean War. Approximately 100 of these lifeboats were built—their serial numbers began at 501 and continued in sequence.
The A-3 lifeboat was 30.05 feet (9.16 m) long and it weighed 2,736 pounds (1,241 kg) when fully loaded and ready for attachment to the aircraft. The A-3 lifeboat could rescue 15 people. It was powered by a four-cylinder four-stroke Meteor 20 gasoline engine made by the Red Wing Motor Company. With an Ailsa Craig propeller it was expected to give a speed of 8 knots (9.2 mph) under calm water conditions. Nearly 100 US gallons (380 L) of fuel were on board. The airborne lifeboat was dropped from the SB-29 on a single 100-foot (30 m) parachute. Like previous airborne lifeboat designs, it was self-righting. The boat had a boarding ladder, and carried food and water for the rescued people.
In March 1951, Time magazine reported that the USAF was testing a radio controlled steering device for the A-3 lifeboat. After the boat dropped into the sea, a radio operator aboard the rescue aircraft would start the lifeboat's engine remotely, then direct the boat toward the survivors to make it easier for them to reach. After climbing aboard, the survivors could talk to the circling aircraft by two-way radio. A gyrocompass aboard the lifeboat would be set toward the nearest safe land, and the supply of fuel would allow for 800 miles (1,300 km) of range, with further range possible if additional water, food and fuel supplies were dropped along the way. The USAF expected all their A-3 lifeboats to be equipped with radio control by early 1952. [1]
After World War II, sixteen Boeing B-29 Superfortress bombers were converted to carry the lifeboat and assigned rescue duty on a rotating basis, designated SB-29 in a role called "Super Dumbo". The first SB-29s were received by the Air Rescue Service in February 1947. They served in the Korean War [2] where A-3 lifeboats were carried by Super Dumbos over the Yellow Sea and the Sea of Japan.
From the beginning of the Korean War, the A-3 lifeboat was kept shackled underneath an SB-29 waiting in constant readiness on the ground at each rescue airbase. Inside of the aircraft, however rainwater could enter the boat and pool within an open end of the deployment parachute's bag. After one air drop which failed because of water that had frozen at high altitude, trapping the parachute, the A-3 lifeboat was stored disconnected from the aircraft and with a rain cover in place. [3]
Later in the Korean War, the USAF worked on improving the A-3 with a butterfly fin to stabilize the boat till the parachute opened, a full cover, enabling the drop aircraft to start the lifeboat's motor and steer it to the location of persons in the water, and other improvements. Whether any of these improved A-3s were built beyond the prototype and saw active use is unknown. [4]
Lifeboat number 603 has been restored by the National Museum of the United States Air Force in Dayton, Ohio.
Lifeboat SN Unknown is displayed at the Pima Air & Space Museum in Tucson, Arizona. [5] [ better source needed ]
The Laconia incident was a series of events surrounding the sinking of a British passenger ship in the Atlantic Ocean on 12 September 1942, during World War II, and a subsequent aerial attack on German and Italian submarines involved in rescue attempts. RMS Laconia, carrying 2,732 crew, passengers, soldiers, and prisoners of war, was torpedoed and sunk by U-156, a German U-boat, off the West African coast. Operating partly under the dictates of the old prize rules, the U-boat's commander, Korvettenkapitän Werner Hartenstein, immediately commenced rescue operations. U-156 broadcast her position on open radio channels to all Allied powers nearby, and was joined by the crews of several other U-boats in the vicinity.
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