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The first known lawn mower had a cylinder cutting gear made of iron. [citation needed] It was used to mow sporting grounds and wide-ranging gardens.As manufacturers changed the design and structure of mowers, the cutting mechanism also developed and evolved into several varieties, including cylinder/reel blades, deck blades, mulching blades, and lifting blades.
Historical one-handed versions have blades varying from 45 to 80 cm (18 to 31 in) in length. The weight of an average sword of 70 cm (28 in) blade-length would weigh about 700 to 900 g (1.5 to 2.0 lb). [20] There are also larger two-handed versions used by ancient and medieval armies and for training by many styles of Chinese martial arts.
The QF 4-inch gun Mk IV [note 1] was the main gun on most Royal Navy and British Empire destroyers in World War I. It was introduced in 1911 as a faster-loading light gun successor to the BL 4 inch Mk VIII gun. Of the 1,141 produced, 939 were still available in 1939. [1] Mk XII and Mk XXII variants armed many British interwar and World War II ...
Retreating blade stall is a hazardous flight condition in helicopters and other rotary wing aircraft, where the retreating rotor blade has a lower relative blade speed, combined with an increased angle of attack, causing a stall and loss of lift. Retreating blade stall is the primary limiting factor of a helicopter's never exceed speed, V NE. [1]
The Predator franchise depicts a series of deadly encounters between humanity and a hostile, trophy-hunting extraterrestrial species known as the Yautja.Predominantly transpiring in the present day of the 20th and 21st century, the series comprises films that, while largely independent, portray human confrontations with Yautjas in different locations.
The A350-1000 wing is 22.3 m 2 (240 sq ft) larger through a 30 cm (12 in) extension to the inboard sections of the fixed trailing edge. [ 162 ] A new trailing-edge high-lift device has been adopted with an advanced dropped-hinge flap similar to that of the A380, which permits the gap between the trailing edge and the flap to be closed with the ...
SS United States is a retired American ocean liner that was built during 1950 and 1951 for United States Lines.She is the largest ocean liner to be entirely constructed in the United States and the fastest ocean liner to cross the Atlantic Ocean in either direction, retaining the Blue Riband for the highest average speed since her maiden voyage in 1952, a title she still holds.
Blade Runner is a 1982 science fiction film directed by Ridley Scott from a screenplay by Hampton Fancher and David Peoples. [7] [8] Starring Harrison Ford, Rutger Hauer, Sean Young, and Edward James Olmos, it is an adaptation of Philip K. Dick's 1968 novel Do Androids Dream of Electric Sheep?