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Unlike the cylinder desk, the rolltop desk could be mass-produced rather easily since the simple wooden slats could be turned out very fast in a uniform way. In contrast, the wooden section of a cylinder had to be treated with great pains to keep its form perfectly over time, lest it warp or bend, and make it impossible to retract or extend.
A large air vortex cannon, with a 9 feet (2.7 m) wide barrel and a displacement volume of 2,873 US gallons (10.88 m 3) was built in March 2008 at the University of Minnesota, and could blow out candles at 180 feet (55 m). [6] [7] In 2012, a large air vortex cannon was built for Czech Television program Zázraky přírody (lit. ' Wonders of ...
The velocity of a projectile in a vacuum cannon can be modeled. The maximum velocity is independent of the projectile mass and barrel diameter. In this model, the maximum velocity is lower than the speed of sound (about 343 m/s (1,130 ft/s; 770 mph; 1,230 km/h)).
The Ares Incorporated XM274 (originally designated as the medium caliber, antiarmor automatic cannon, MC-AAAC) was an American smoothbore 75mm autocannon designed by Eugene Stoner. [1] It used a rotating breech block with cased telescopic ammunition. It was developed for the HIMAG program, but was later used on a variety of test vehicles. [2]
Since the beginning of the 1970s, the 40 mm Bofors L/60s have been used in the United States Air Force's Lockheed AC-130 gunships in the air-to-ground role. [46] Between 2006 and 2012, there were plans to remove these and the 20 mm M61 Vulcans from newer AC-130U variants and replace them with 30 mm autocannons.
A barrel bomb is an unguided IED made to be dropped from helicopters and fixed-wing aircraft. A lob bomb is a rocket-fired IED. Barrack busters were improvised mortars used by the Provisional Irish Republican Army during The Troubles. Acid packets were used by rioters during the Citizenship Amendment Act protests in India [63]
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Quad-cannon Z-5 installation by the design bureau of Plant No. 88 from 1944 to 1945. Did not go into production. An automatic mountain-range anti-air cannon (plans being approved on March 1, 1940) with a planned weight of less than 650 kg, a three-leg carriage, fed by 20-round magazines and towed by four horses or disassembled into 7-8 backpacks.
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