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The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...
A 12-gauge shotgun, nominally 18.5 mm (0.73 in), can range from a tight 18 mm (0.71 in) to an extreme overbore of 20 mm (0.79 in). Some also claim an increased velocity with the overbored barrels, up to 15 m/s (49 ft/s), which is due to the larger swept volume of the overbored barrel.
The 5 cm Flak 41 (Flugabwehrkanone 41) was a German 50 mm (2.0 in) anti-aircraft gun produced for defending the intermediate zone above the range of light (37 mm (1.5 in)) guns, but below the ceiling of the heavy (75 mm (3.0 in) and above) pieces. The gun proved inadequate and was produced only in small numbers.
The U.S. Navy adopted the Maxim-Nordenfelt 37 mm 1-pounder as the 1-pounder Mark 6 before the 1898 Spanish–American War. The Mark 7, 9, 14, and 15 weapons were similar. [ 25 ] It was the first dedicated anti-aircraft (AA) gun adopted by the US Navy, specified as such on the Sampson -class destroyers launched in 1916–17.
37 mm flare or "1.5 inch" caliber is the specification for a common launching system for non-lethal and less-lethal ammunition. Such launchers are also often known as "gas guns" due to their original use by police for launching tear gas projectiles.
The VPAM scale as of 2009 runs from 1 to 14, with 1-5 being soft armor, and 6-14 being hard armor. [1] Tested armor must withstand three hits, spaced 120 mm (4.7 inches) apart, of the designated test threat with no more than 25 mm (0.98 inches) of back-face deformation in order to pass.
The Type 1 47 mm AT gun was introduced to combat service in 1941, with the intent of it replacing the Type 94 37 mm (1.5 in) anti-tank gun. It was very effective for its role, with American personnel calling it "an excellent weapon, with mechanized carriage and a high muzzle-velocity" that "proved most effective in combat," though it was not ...
The Mark 12 5"/38-caliber gun was a United States dual-purpose naval gun, but also installed in single-purpose mounts on a handful of ships.The 38-caliber barrel was a mid-length compromise between the previous United States standard 5"/51 low-angle gun and 5"/25 anti-aircraft gun.