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The machine was also known as the SIGABA or Converter M-134 by the Army, or CSP-888/889 by the Navy, and a modified Navy version was termed the CSP-2900. Like many machines of the era it used an electromechanical system of rotors to encipher messages, but with a number of security improvements over previous designs.
Magazine Country Language Frequency Published Amateur Radio Australia: English Bimonthly 1933–present The Canadian Amateur Canada: English, French Bimonthly Canadian Int. DX Club "Messenger" Canada: English Monthly 1962-present The Communicator Canada: English Bi-Monthly ~2000-present Radioamatööri Finland: Finnish Monthly 1950–present CQ DL
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The core of the M134D was a steel housing and rotor. To focus on weight reduction, a titanium housing and rotor were introduced, creating the M134D-T which had reduced weight from 62 lb (28 kg) to 41 lb (19 kg). The gun housing had a 500,000-round lifespan before it wore out, which was far higher than a conventional machine gun's 40,000-round ...
It had a single three-blade rotor originally powered by a 75 horsepower (56 kW) engine. The first "free" flight of the VS-300 was on 13 May 1940. [2] The VS-300 was the first successful single lifting rotor helicopter in the United States and the first successful helicopter to use a single vertical-plane tail rotor configuration for antitorque.
The Radar Fence was a planned U.S. Cold War air defense "warning and control system" for $600 million (including $388 million for radars and other equipment) proposed in a report by Maj. Gen. Francis L. "Ankenbrandt and his communications officers" and which was approved by the USAF Chief of Staff on November 21, 1947. [3]
The stopped rotor type has a separate system for forward thrust. It takes off like a helicopter but for forward flight the rotor stops and acts as a fixed wing. The gyrocopter is similar except that the rotor continues to spin and to generate a significant amount of lift, and so is classed as a rotorcraft and not a convertiplane.
The Fa 330 directly inspired Igor Bensen's interest in small autogyros which culminated in the Bensen B-8 and other modern autogyros.. In February 2013, Aviation Week and Space Technology reported that L-3 Communications was testing its Valkyrie, an unpowered, tethered autogyro that weighs 210 pounds (95 kg), which is intended to serve as a cheap alternative to a shipborne helicopter.