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61environmental works — ▪ civil engineering Introduction infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …
62flight, history of — ▪ aviation Introduction development of heavier than air flying machines. Important landmarks and events along the way to the invention of the airplane include an understanding of the dynamic reaction of lifting surfaces (or wings), building… …
63Expander cycle (rocket) — The expander cycle is a power cycle of a bipropellant rocket engine meant to improve the efficiency of fuel delivery.In an expander cycle, the fuel is heated before it is combusted, usually with waste heat from the main combustion chamber. As the …
64List of accidents and incidents involving military aircraft, pre-1950 — This is a list of notable accidents and incidents involving military aircraft grouped by the year in which the accident or incident occurred. For more exhaustive lists, see the [http://www.baaa acro.com/ Aircraft Crash Record Office] or the [http …
65Boeing AH-64 Apache — AH 64 Apache An AH 64D Apache from U.S. Army s 101st Aviation R …
66Single-stage-to-orbit — The VentureStar was a proposed SSTO spaceplane. A single stage to orbit (or SSTO) vehicle reaches orbit from the surface of a body without jettisoning hardware, expending only propellants and fluids. The term usually, but not exclusively, refers… …
67Elite (video game) — Elite Cover art for Firebird releases of Elite Developer(s) David Braben and Ian Bell …
68gasoline engine — Most widely used form of internal combustion engine, found in most automobiles and many other vehicles. Gasoline engines vary significantly in size, weight per unit of power generated, and arrangement of components. The principal type is the… …
69Blast furnace — A blast furnace is a type of metallurgical furnace used for smelting to produce metals, generally iron. In a blast furnace, fuel and ore are continuously supplied through the top of the furnace, while air (sometimes with oxygen enrichment) is… …
70List of NASCAR teams — The following is a list of teams in NASCAR s three premier series of Sprint Cup, Nationwide and Camping World Truck that have competed or are scheduled to compete this season. Contents 1 Current NASCAR Sprint Cup Series Teams 2 Current NASCAR… …
