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Post, Wiley

(Encyclopedia)Post, Wiley, 1899–1935, American aviator, b. Grand Plain, Tex. He won fame in 1931 when he and Harold Gatty flew around the northern part of the earth in 8 days 15 hr 51 min. In 1933 he made a secon...

Trollhättan

(Encyclopedia)Trollhättan trôlˈhĕˌtän [key], city (1990 pop. 40,180), Älvsborg co., S Sweden, on the Götaälv River near Lake Vänern. The Götaälv River, which falls 108 ft (33 m) in about 1 mi (1.6 km) a...

aerodynamics

(Encyclopedia)aerodynamics, study of gases in motion. As the principal application of aerodynamics is the design of aircraft, air is the gas with which the science is most concerned. Although aerodynamics is primar...

Mach number

(Encyclopedia)Mach number mäk [key] [for E. Mach], ratio between the speed of an object and the speed of sound in the medium in which the object is traveling. An airplane that has the velocity of Mach 3.0 is trave...

international date line

(Encyclopedia)international date line, imaginary line on the earth's surface, generally following the 180° meridian of longitude, where, by international agreement, travelers change dates. Traveling eastward acros...

vertical takeoff and landing aircraft

(Encyclopedia)vertical takeoff and landing aircraft (VTOL), craft capable of rising and descending vertically from and to the ground, thus requiring no runway. While a balloon or an airship has obvious VTOL capabil...

Hitchcock, Thomas, Jr.

(Encyclopedia)Hitchcock, Thomas, Jr., 1900–1944, American polo player and aviator, b. Aiken, S.C. The son of avid polo players, Tommy Hitchcock played in his first tournament at the age of 13. Hitchcock's polo pl...

Irving

(Encyclopedia)Irving, city (2020 pop. 256,684), Dallas co., N Tex., a suburb of Dallas; inc. as a city 1952. Building supplies, chemicals, electronic equipment, and a...

Piqua

(Encyclopedia)Piqua pĭkˈwā [key], city (1990 pop. 20,612), Miami co., W Ohio, on the Miami River; settled 1797, chartered 1929. It is an industrial city with diverse manufactures, including airplane and automobi...

Bras d'Or Lake

(Encyclopedia)Bras d'Or Lake brä dôr [key], arm of the Atlantic Ocean, c.360 sq mi (930 sq km), indenting deeply into Cape Breton Island, N.S., SE Canada, and occupying much of the interior. A narrow channel link...