air-breathing power unit
41Upholder/Victoria class submarine — The Upholder / Victoria class submarines, also known as the Type 2400 (due to their displacement of 2,400t), are diesel electric Fleet submarines designed in the UK in the late 1970s to supplement the Royal Navy s nuclear submarine force. In 1998 …
42USS Houston (SSN-713) — USS Houston (SSN 713), a Los Angeles class submarine, was the fourth ship of the United States Navy to be named for Houston, Texas. The contract to build her was awarded to Newport News Shipbuilding and Dry Dock Company in Newport News, Virginia… …
43skeleton — skeletonless, adj. skeletonlike, adj. /skel i tn/, n. 1. Anat., Zool. the bones of a human or an animal considered as a whole, together forming the framework of the body. 2. any of various structures forming a rigid framework in an invertebrate.… …
44North American Aerospace Defense Command — NORAD redirects here. For other uses, see NORAD (disambiguation). North American Aerospace Defense Command Colorado Springs, Colorado …
45India and weapons of mass destruction — India Nuclear program start date 1967 First nuclear weapon test 18 May 1974 (Smiling Buddha) …
46List of QI episodes (D series) — infobox tvseason season name = QI Series D caption = dvd release date = country = UK network = BBC first aired = 29 September 2006 last aired = 15 December 2006 num episodes = 13 prev series = Series C next series = Series E|This is a list of… …
47Tsiolkovsky rocket equation — Tsiolkovsky s rocket equation, or ideal rocket equation is named after Konstantin Tsiolkovsky, who independently derived it and published in his 1903 work [К. Э. Циолковский, Исследование мировых пространств реактивными приборами, 1903. It is… …
48Specific fuel consumption (thrust) — Specific fuel consumption, often shortened to SFC, or TSFC is an engineering term that is used to describe the fuel efficiency of an engine design with respect to thrust output. It allows the efficiency of different sized engines to be directly… …
49Indian Space Research Organisation — Infobox Space agency name = Indian Space Research Organisation acronym = ISRO caption = ISRO logo headquarters = Antariksh Bhavan, New BEL Road, BANGALORE, INDIA spaceport = TERLS, SRLS, BRLS established = 15th August, 1969 chairman = G. Madhavan …
50Mechanical ventilation — In architecture and climate control, mechanical or forced ventilation is the use of powered equipment, e.g. fans and blowers, to move air  see ventilation (architecture). Mechanical ventilation Intervention …
