163B "V18". The first new official record in the post-war period was achieved by a Gloster Meteor F Mk.4 in November 1945, at . The first aircraft to exceed the unofficial October 1941 record of the Me 163A V4 was the Douglas D-558-1 Skystreak, which achieved in August 1947. The July 1944 unofficial record of the Me 163B V18 was officially surpassed in November 1947, when Chuck Yeager flew the Bell X-1 to . The official speed record for a seaplane moved by piston engine is , which attained on 24 October 1934, by Francesco Agello in the Macchi-Castoldi M.C.72 seaplane ("idrocorsa") and it remains the current record. It was equipped with the Fiat AS.6 engine (version 1934) developing a power of at 3,300 rpm, with coaxial counter-rotating propellers. The original record holding Macchi-Castoldi M.C.72 MM.181 seaplane is at the Air Force Museum at Vigna di Valle in Italy. Other air speed records Flying between any two airports allow a large number of combinations, so setting a speed record ("speed over a recognised course") is fairly easy with an ordinary aircraft, although there are many administrative requirements for recognition. See also Flight altitude record Fastest propeller-driven aircraft List of vehicle speed records Lockheed X-7 - Mach 4.31 (2,881 mph) in the 1950s Messerschmitt Me 163 Komet World record References Allward, Maurice. Modern Combat Aircraft 4: F-86 Sabre. London: Ian Allan, 1978. . Andrews, C.F. and E.B. Morgan. Supermarine Aircraft since 1914. London:Putnam, 1987. . Belyakov, R.A. and J. Marmain. MiG: Fifty Years of Secret Aircraft Design. Shrewsbury, UK:Airlife, 1994. . Bowers, Peter M. Curtiss Aircraft 1907–1947. London:Putnam, 1979. . Cooper, H.J. "The World's Speed Record". Flight, 25 May 1951, pp. 617–619. "Eighteen Years of World's Records". Flight, 7 February 1924, pp. 73–75. Francillon, René J. McDonnell Douglas Aircraft since 1920. London:Putnam, 1979. . James, Derek N. Gloster Aircraft since 1917. London:Putnam, 1971. . Mason, Francis K. The British Fighter since 1912. Annapolis Maryland, US: Naval Institute Press, 1992. . Munson, Kenneth and John William Ransom Taylor Jane's Pocket Book of Record-breaking Aircraft. New York New York, US: Macmillan, 1978. . Taylor, H. A. Fairey Aircraft since 1915. London:Putnam, 1974. . Taylor, John W. R. Jane's All The World's Aircraft 1965–66. London:Sampson Low, Marston & Company, 1965. Taylor, John W. R. Jane's All The World's Aircraft 1976–77. London:Jane's Yearbooks, 1976. . Taylor, John W. R. Jane's All The World's Aircraft 1988–89.