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{{Short description|U.S. federal agency; predecessor to NASA}}{{Redirect|NACA}}{{Use American English|date=September 2019}}{{Use mdy dates|date=April 2017}}

factoids

The National Advisory Committee for Aeronautics (NACA) was a United States federal agency founded on March 3, 1915, to undertake, promote, and institutionalize aeronautical research.WEB, NACA Overview,weblink 2022-04-20, history.nasa.gov, On October 1, 1958, the agency was dissolved and its assets and personnel were transferred to the newly created National Aeronautics and Space Administration (NASA). NACA is an initialism, i.e., pronounced as individual letters, rather than as a whole wordMurray, Charles, and Catherine Bly Cox. Apollo. South Mountain Books, 2004, p. xiii. (as was NASA during the early years after being established).WEB,weblink Creation of NASA: Message to Employees of NACA from T. Keith Glennan 1958 NASA, Jeff Quitney, May 17, 2013, May 8, 2018, YouTube, live,weblink November 22, 2016, mdy-all, Among other advancements, NACA research and development produced the NACA duct, a type of air intake used in modern automotive applications, the NACA cowling, and several series of NACA airfoils,WEB, Abbot, Ira H, Summary of airfoil data NACA report 824,weblink 20 Apr 2022, engineering.purdue.edu/, which are still used in aircraft manufacturing.During World War II, NACA was described as "The Force Behind Our Air Supremacy" due to its key role in producing working superchargers for high altitude bombers, and for producing the laminar wing profiles for the North American P-51 Mustang.WEB,weblink NASA - WWII & NACA: US Aviation Research Helped Speed Victory, www.nasa.gov, May 8, 2018, live,weblink December 18, 2017, mdy-all, NACA also helped in developing the area rule that is used on all modern supersonic aircraft, and conducted the key compressibility research that enabled the Bell X-1 to break the sound barrier.

Origins

(File:NACA credo.jpg|thumb|upright|The inscription on the wall is NACA's mission statement: "...It shall be the duty of the advisory committee for aeronautics to supervise and direct the scientific study of the problems of flight with a view to their practical solution ..." By an Act of Congress Approved March 3, 1915)(File:First Meeting of the NACA 1915 - GPN-2000-001571.jpg|thumb|The first meeting of the NACA in 1915)NACA was established on March 13, 1915, by the federal government through enabling legislation as an emergency measure during World War I to promote industry, academic, and government coordination on war-related projects. It was modeled on similar national agencies found in Europe: the French L'Etablissement Central de l'Aérostation Militaire in Meudon (now Office National d'Etudes et de Recherches Aerospatiales), the German Aerodynamic Laboratory of the University of Göttingen, and the Russian Aerodynamic Institute of Koutchino (replaced in 1918 with the Central Aerohydrodynamic Institute (TsAGI), which is still in existence). The most influential agency upon which the NACA was based was the British Advisory Committee for Aeronautics.In December 1912, President William Howard Taft had appointed a National Aerodynamical Laboratory Commission chaired by Robert S. Woodward, president of the Carnegie Institution of Washington. Legislation was introduced in both houses of Congress early in January 1913 to approve the commission, but when it came to a vote, the legislation was defeated.Charles D. Walcott, secretary of the Smithsonian Institution from 1907 to 1927, took up the effort, and in January 1915, Senator Benjamin R. Tillman, and Representative Ernest W. Roberts introduced identical resolutions recommending the creation of an advisory committee as outlined by Walcott. The purpose of the committee was "to supervise and direct the scientific study of the problems of flight with a view to their practical solution, and to determine the problems which should be experimentally attacked and to discuss their solution and their application to practical questions". Assistant Secretary of the Navy Franklin D. Roosevelt wrote that he "heartily [endorsed] the principle" on which the legislation was based. Walcott suggested the tactic of adding the resolution to the Naval Appropriations Bill.WEB,weblink Model Research - Volume 1, Roland, Alex,weblink 2004-11-13, According to one source, "The enabling legislation for the NACA slipped through almost unnoticed as a rider attached to the Naval Appropriation Bill, on March 3, 1915."WEB,weblink Orders of Magnitude, Chapter 1, Bilstein, Roger E., live,weblink" title="web.archive.org/web/20070114221127weblink">weblink January 14, 2007, mdy-all, The committee of 12 people, all unpaid, were allocated a budget of $5,000 per year.President Woodrow Wilson signed it into law the same day, thus formally creating the Advisory Committee for Aeronautics, as it was called in the legislation, on the last day of the 63rd Congress.The act of Congress creating NACA, approved March 3, 1915, reads, "...It shall be the duty of the advisory committee for aeronautics to supervise and direct the scientific study of the problems of flight with a view to their practical solution. ... "WEB,weblink Engines and Innovation, Dawson, Virginia P.,weblink 2004-10-31,

Research

File:The NACA Test Force - GPN-2000-000083.jpg|thumb|The NACA Test Force at the High-Speed Flight Station in Edwards, California. The white aircraft in the foreground is a Douglas SkyrocketDouglas Skyrocket(File:Model in Supersonic Wind Tunnel GPN-2000-001631.jpg|thumb|An engineer makes final calibrations to a model mounted in the {{convert|6|x|6|ft|adj=on}} supersonic wind tunnel.)On January 29, 1920, President Wilson appointed pioneering flier and aviation engineer Orville Wright to NACA's board. By the early 1920s, it had adopted a new and more ambitious mission: to promote military and civilian aviation through applied research that looked beyond current needs. NACA researchers pursued this mission through the agency's impressive collection of in-house wind tunnels, engine test stands, and flight test facilities. Commercial and military clients were also permitted to use NACA facilities on a contract basis.

Facilities

• Langley Memorial Aeronautical Laboratory (Hampton, Virginia)
• Ames Aeronautical Laboratory (Moffett Field)
• Aircraft Engine Research Laboratory (Lewis Research Center)
• Muroc Flight Test Unit (Edwards Air Force Base)

In 1922, NACA had 100 employees. By 1938, it had 426. In addition to formal assignments, staff were encouraged to pursue unauthorized "bootleg" research, provided that it was not too exotic. The result was a long string of fundamental breakthroughs, including "thin airfoil theory" (1920s), "NACA engine cowl" (1930s), the "NACA airfoil" series (1940s), and the "area rule" for supersonic aircraft (1950s). On the other hand, NACA's 1941 refusal to increase airspeed in their wind tunnels set Lockheed back a year in their quest to solve the problem of compressibility encountered in high speed dives made by the Lockheed P-38 Lightning.Bodie, Warren M. The Lockheed P-38 Lightning: The Definitive Story of Lockheed's P-38 Fighter. Hayesville, North Carolina: Widewing Publications, 2001, 1991, pp. 174–5. {{ISBN|0-9629359-5-6}}.The full-size {{convert|30|x|60|ft|adj=on}} Langley wind tunnel operated at no more than {{convert|100|mph|kn km/h|abbr=on}} and the then-recent {{convert|7|x|10|ft|adj=on}} tunnels at Moffett could only reach {{convert|250|mph|kn km/h|abbr=on}}. These were speeds Lockheed engineers considered useless for their purposes. General Henry H. Arnold took up the matter and overruled NACA objections to higher air speeds. NACA built a handful of new high-speed wind tunnels, and Mach 0.75 ({{convert|570|mph|kn km/h|0|abbr=on}}) was reached at Moffett's {{convert|16|ft|adj=on}} wind tunnel late in 1942.Bodie, Warren M. The Lockheed P-38 Lightning. pp. 75-6.WEB,weblink ch3-5, www.hq.nasa.gov, May 8, 2018, live,weblink" title="web.archive.org/web/20160914061156weblink">weblink September 14, 2016, mdy-all,

Wind tunnels

{{Further|Subsonic and transonic wind tunnel}}{{unreferenced section|date=March 2018}}(File:National Advisory Committee for Aeronautics wind tests (1946).webm|thumb|NACA wind test on a human subject (1946))NACA's first wind tunnel was formally dedicated at Langley Memorial Aeronautical Laboratory on June 11, 1920.WEB,weblink The NACA's First Wind Tunnel, Joskow, Melissa, Dennis, Warren, National Aeronautics and Space Administration, 10 June 2015, NASA History, 8 July 2021, It was the first of many now-famous NACA and NASA wind tunnels. Although this specific wind tunnel was not unique or advanced, it enabled NACA engineers and scientists to develop and test new and advanced concepts in aerodynamics and to improve future wind tunnel design.

1. Atmospheric 5-ft wind tunnel (1920)
2. Variable Density Tunnel (1922)
3. Propeller Research Tunnel (1927)
4. High-speed 11-in wind tunnel (1928)
5. Vertical 5-ft wind tunnel (1929)
6. Atmospheric 7- by 10-ft wind tunnel (1930)
7. Full-scale 30- by 60-ft tunnel (1931)

Influence on World War II technology

In the years immediately preceding World War II, NACA was involved in the development of several designs that served key roles in the war effort. When engineers at a major engine manufacturer were having issues producing superchargers that would allow the Boeing B-17 Flying Fortress to maintain power at high altitude, a team of engineers from NACA solved the problems and created the standards and testing methods used to produce effective superchargers in the future. This enabled the B-17 to be used as a key aircraft in the war effort. The designs and information gained from NACA research on the B-17 were used in nearly every major U.S. military powerplant of the Second World War. Nearly every aircraft used some form of forced induction that relied on information developed by NACA. Because of this, U.S.-produced aircraft had a significant power advantage above 15,000 feet, which was never fully countered by Axis forces.{{citation needed|date=July 2015}}After the war had begun, the British government sent a request to North American Aviation for a new fighter. The offered P-40 Tomahawk fighters were considered too outdated to be a feasible front line fighter by European standards, and so North American began development of a new aircraft. The British government chose a NACA-developed airfoil for the fighter, which enabled it to perform dramatically better than previous models. This aircraft became known as the P-51 Mustang.

Supersonic research

File:Bell X-1 color.jpg|thumb|The NACA XS-1 (Bell X-1Bell X-1File:NACA-Ames-1958.jpg|thumb|The NACA Scientific and Engineering Staff at the Ames Research CenterAmes Research CenterAfter early experiments by Opel RAK with rocket propulsion leading to the first public flight of a rocket plane, the Opel RAK.1, in 1929 and eventual military programs at Heinkel and Messerschmitt by Nazi Germany in the 1930s and 1940s, the US entered the race to supersonic planes and spaceflight in the 1940s. Although the Bell X-1 was commissioned by the Air Force and flown by Air Force test pilot Chuck Yeager, when it exceeded Mach 1 NACA was officially in charge of the testing and development of the aircraft.WEB, John Uri, June 12, 2023, 95 Years Ago: First Human Rocket-Powered Aircraft Flight,weblink NASA, 26 February 2024, NACA ran the experiments and data collection, and the bulk of the research used to develop the aircraft came from NACA engineer John Stack, the head of NACA's compressibility division. Compressibility is a major issue as aircraft approach Mach 1, and research into solving the problem drew heavily on information collected during previous NACA wind tunnel testing to assist Lockheed with the P-38 Lightning.The X-1 program was first envisioned in 1944 when a former NACA engineer working for Bell Aircraft approached the Army for funding of a supersonic test aircraft. Neither the Army nor Bell had any experience in this area, so the majority of research came from the NACA Compressibility Research Division, which had been operating for more than a year by the time Bell began conceptual designs. The Compressibility Research Division also had years of additional research and data to pull from, as its head engineer was previously head of the high speed wind tunnel division, which itself had nearly a decade of high speed test data by that time. Due to the importance of NACA involvement, Stack was personally awarded the Collier Trophy along with the owner of Bell Aircraft and test pilot Chuck Yeager.From Engineering Science to Big Science: The NACA and NASA Collier Trophy Research Project Winners, 1998, P.89WEB, Dryden Flight Research Center historical data, NASA,weblink 2006-12-10, live,weblink" title="web.archive.org/web/20061013060339weblink">weblink October 13, 2006, mdy-all, In 1951, NACA Engineer Richard Whitcomb determined the area rule that explained transonic flow over an aircraft. The first uses of this theory were on the Convair F-102 project and the F11F Tiger. The F-102 was meant to be a supersonic interceptor, but it was unable to exceed the speed of sound, despite the best effort of Convair engineers. The F-102 had actually already begun production when this was discovered, so NACA engineers were sent to quickly solve the problem at hand. The production line had to be modified to allow the modification of F-102s already in production to allow them to use the area rule. (Aircraft so altered were known as "area ruled" aircraft.) The design changes allowed the aircraft to exceed Mach 1, but only by a small margin, as the rest of the Convair design was not optimized for this. As the F-11F was the first design to incorporate this during initial design, it was able to break the sound barrier without having to use afterburner.From Engineering Science to Big Science: The NACA and NASA Collier Trophy Research Project Winners, 1998, p. 146.Because the area rule was initially classified, it took several years for Whitcomb to be recognized for his accomplishment. In 1955 he was awarded the Collier Trophy for his work on both the Tiger and the F-102.From Engineering Science to Big Science: The NACA and NASA Collier Trophy p. 147The most important design resulting from the area rule was the B-58 Hustler, which was already in development at the time. It was redesigned to take the area rule into effect, allowing greatly improved performance.From Engineering Science to Big Science: The NACA and NASA Collier Trophy Research Project Winners, 1998, P.147 This was the first US supersonic bomber, and was capable of Mach 2 at a time when Soviet fighters had only just attained that speed months earlier.WEB,weblink B-58 Hustler Records & 15,000 miles non-stop in the SR-71, Leland R, Haynes, www.wvi.com, May 8, 2018, live,weblink" title="web.archive.org/web/20171102022453weblink">weblink November 2, 2017, mdy-all, The area rule concept is now used in designing all transonic and supersonic aircraft.NACA experience provided a model for World War II research, the postwar government laboratories, and NACA's successor, the National Aeronautics and Space Administration (NASA).NACA also participated in development of the first aircraft to fly to the "edge of space", North American's (North American X-15|X-15]]. NACA airfoils are still used on modern aircraft.

Chairmen{| class"wikitable" style"text-align:center"

!{{Abbr|No.|Number}}!Portrait!Name!Term!colspan="2"|President{{small|serving under}}| 1missing image!
- Brigadier General George P. Scriven US Army in full dress uniform.jpg>100px|George P. Scriven)Brigadier general (United States)>Brig. Gen. George P. Scriven{{small|(United States Army)}}| 1915–1916Woodrow Wilson| 2William F. DurandWilliam F. Durand{{small>(Stanford University)}}| 1916–1918| 3John R. FreemanJohn Ripley Freeman>John R. Freeman{{small|(Consultant)}}| 1918–1919 4 Charles Walcott.jpgCharles Doolittle Walcott Charles Doolittle Walcott{{small|(Smithsonian Institution)}} 1920–1927 Warren G. HardingCalvin Coolidge 5 Portrait of Joseph Sweetman Ames from Who's Who in American Aeronautics 1922.pngJoseph Sweetman Ames Joseph Sweetman Ames{{small|(Johns Hopkins University)}} 1927–1939Herbert HooverFranklin D. Roosevelt| 6Vannevar BushVannevar Bush{{small>(Carnegie Institution)}}| 1940–1941 7 Jerome Clarke Hunsaker (cropped).jpgJerome C. Hunsaker Captain (United States O-6) Jerome Clarke Hunsaker>Jerome C. Hunsaker{{smallUnited States Navy>Navy, MIT)}} 1941–1956Harry S. TrumanDwight D. Eisenhower| 8James H. DoolittleLieutenant general (United States)>Lt. Gen. James H. Doolittle{{small|(Shell Oil Company)}}| 1957–1958

Transformation into NASA

Special Committee on Space Technology

File:NACA's Special Committee on Space Technology.jpg -