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Boeing B-29 Superfortress at the Lewis Flight Propulsion Laboratory
Summary
The NACA’s Lewis Flight Propulsion Laboratory used a Boeing B-29 Superfortress as a testbed for ramjet investigations in the late 1940s. NACA Lewis conducted a wide variety of studies on ramjets to determine basic operational data necessary to design missiles. This information included the relationship between combustion chamber and inlet pressure and temperature, velocity of the fuel-air ratio to the ignition characteristics, and combustion efficiency. Although wind tunnel and test stand studies were important first steps in determining these factors, actual flight tests were required. Lewis engineers modified the B-29 so that the ramjet could be stored in the bomb bay. Once the aircraft reached the desired altitude and speed the ramjet was suspended 52 inches below the bomb bay. The ramjet’s angle-of-attack could be independently adjusted, and a periscope permitted a view of the test article from inside the aircraft. Measurements were taken in free-stream conditions between 5,000 and 30,000 feet. The test flights, which began in April 1947, were flown at speeds up to Mach 0.51 and altitudes of 5,000 to 30,000 feet. The researchers first determined that 14,000 feet was the maximum altitude at which the engine could be ignited by spark. Flares were used to start the engine at altitudes up to 30,000 feet. Overall the ramjet operated well at all speeds and altitudes. Significant changes in fuel flow were successful at lower altitudes, but produced combustion blowout above 20,000 feet.
We at GetArchive are exploring new methods of image metadata augmentation and verification. Our goal is to make it possible to find images on any topic. In particular, we are trying to verify and fix historic periodization. This collection is made of historic photographs of automobiles that look as if they were taken in the 1940s. The collection is made with aid of a neural image recognition network dealing with the whole image composition rather than with the car model - some cars may be dated incorrectly. Although, while this method is surprisingly good for the purpose of dating and tagging, a certain percentage of images (less than 8%) may not represent automobile, but other vehicle type or visually similar object. Naturally, our next step should be creating numerous datasets for a particular car years&models, but as of September 2022, we found no use to justify the effort.
The Boeing B-29 Superfortress is a four-engine heavy bomber designed by Boeing during the Second World War. It was used primarily by the United States Army Air Forces in the Pacific theatre of World War II and also during the Korean War. The B-29 was one of the largest aircraft of its time, with a wingspan of 141 feet and a length of 99 feet. It had a top speed of 357 mph and a range of over 3,000 miles. The B-29 was also the first bomber to have a pressurised cabin, allowing it to fly at high altitudes without the need for oxygen masks. One of the most famous B-29s was the Enola Gay, which dropped the atomic bomb on Hiroshima, Japan on 6 August 1945.
Collection - Cars of 1940s
Cars from 1940s and cars that look like if they were around in 1940s.Collection - Boeing B-29
Four-engine, propeller-driven bomber. The aircraft was produced for the United States Army Air Force (USAAF) and was used by the USAF and the US Navy, as well as foreign air forces, including the Royal Air Force and the Royal Australian Air Force.
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