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The Sikorsky R-4 is a two-seat helicopter that was designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine. The R-4 was the world's first large-scale mass-produced helicopter and the first helicopter used by the United States Army Air Forces, [ 1] the United States Navy, the United States Coast Guard and ...
An intermeshing-rotor helicopter (or synchropter) is a helicopter with a set of two main rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding. The arrangement allows the helicopter to function without a tail ...
Military helicopter. A UH-60 Black Hawk operated by the Royal Jordanian Air Force. A military helicopter is a helicopter that is either specifically built or converted for use by military forces. A military helicopter's mission is a function of its design or conversion. The most common use of military helicopters is transport of troops, but ...
Sikorsky Aircraft Corporation. used as the official helicopters of the President of the United States Marine One. 1959. 1961. 1500. Sikorsky S-61R. Medium-lift transport/SAR helicopter. Sikorsky Aircraft Corporation. The S-61R served in the United States Air Force and in the United States Coast Guard.
The Sikorsky–Boeing SB-1 Defiant (stylized as " SB>1 "; company designation S-100) was the Sikorsky Aircraft and Boeing entry for the United States Army 's Future Long-Range Assault Aircraft program to replace the Sikorsky UH-60 Black Hawk. It is a compound helicopter with rigid coaxial rotors, powered by two Honeywell T55 turboshaft engines ...
Sikorsky S-52. The Sikorsky S-52 is a utility helicopter developed by Sikorsky Aircraft in the late 1940s. It was used by the U.S. Navy, Marine Corps, and Coast Guard. [2] The S-52 was the first US helicopter with all-metal rotor blades. Initially a two-seater, it was developed into the four-seat S-52-2 and S-52-3.
Schweizer S300. The Hughes TH-55 Osage is a piston-powered light training helicopter produced for the United States Army. It was also produced as the Model 269 family of light utility helicopters, some of which were marketed as the Model 300. The Model 300C was produced and further developed by Schweizer after 1983.
The Mi-4 transport helicopter laid the groundwork of Soviet Army Aviation. It was widely used both in the armed forces and in Soviet civil aviation, and for several decades remained the main type of helicopter in the inventory of the Soviet Armed Forces and of the Civil Air Fleet. The Mi-4 went out of service with the development of the Mi-8.