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The Enhanced Fujita scale replaced the decommissioned Fujita scale that was introduced in 1971 by Ted Fujita. [6] Operational use began in the United States on February 1, 2007, followed by Canada on April 1, 2013, who uses a modified version known as the CEF-scale.
A fireball between 2,500 and 3,000 °F (1,400 and 1,600 °C) and traveling at 2,000 feet per second (610 m/s) with a pressure of 4,000 psi (28 MPa) blew out from the center gun's open breech. The explosion caved in the door between the center gun room and the turret officer's booth and buckled the bulkheads separating the center gun room from ...
One problem with the design of the gun itself was that the cases would be ejected at constantly varying angles as it heated up and the rate of fire changed, resulting in a large ejection port. [14] The conversion from 4.85mm to 5.56mm also caused a complication, as the rate of fire dropped but the pressure and time curve of the rounds were ...
In addition to sixty-six latent fingerprints aboard the plane, [46] FBI agents recovered Cooper's black clip-on tie, tie clip and two of the four parachutes, [b] one of which had been opened and had three shroud lines cut from the canopy. [47] FBI agents interviewed eyewitnesses in Portland, Seattle and Reno, and developed a series of composite ...
Mercury-Atlas 6 (MA-6) was the first crewed American orbital spaceflight, which took place on February 20, 1962. [4] Piloted by astronaut John Glenn and operated by NASA as part of Project Mercury, it was the fifth human spaceflight, preceded by Soviet orbital flights Vostok 1 and 2 and American sub-orbital flights Mercury-Redstone 3 and 4.