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USS Antietam (CG-54) was a Ticonderoga-class guided missile cruiser of the United States Navy. Antietam was named for the site of the 1862 Battle of Antietam , Maryland , between Confederate forces under General Robert E. Lee and Union forces under Major General George McClellan , during the American Civil War .
The Boeing Vertol CH-46 Sea Knight is a medium-lift tandem-rotor transport helicopter, furnished with a set of counter-rotating main rotors in a tandem-rotor configuration. It was typically powered by a pair of General Electric T58 turboshaft engines, which were mounted on each side of the rear rotor pedestal; power to the forward rotor was ...
[1] [2] Unlike fixed-wing aircraft, of which the stall occurs at relatively low flight speed, the dynamic stall on a helicopter rotor emerges at high airspeeds or/and during manoeuvres with high load factors of helicopters, when the angle of attack(AOA) of blade elements varies intensively due to time-dependent blade flapping, cyclic pitch and ...
Most intermeshing designs have two blades per mast, although exceptions such as the Kellett XR-10 with three blades per mast do exist. The arrangement was developed in Germany by Anton Flettner for a small anti-submarine warfare helicopter, the Flettner Fl 265 as the pioneering example, and later the Flettner Fl 282 Kolibri . [ 1 ]
In round 1, four bladesmiths are asked to replicate a "parameter-heavy" mystery blade in just two hours. Neither the weapon nor the weapon tests are revealed. For round 2, the three remaining smiths are tasked with adding wooden handles to what is unveiled to be a gunstock war club.
The T-54 and T-55 tanks are a series of Soviet medium tanks [3] introduced in the years following the Second World War. The first T-54 prototype was completed at Nizhny Tagil by the end of 1945. [4] From the late 1950s, the T-54 eventually became the main tank for armoured units of the Soviet Army, armies of the Warsaw Pact countries, and many ...
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