The Boeing CH-47 Chinook is a tandem-rotor helicopter originally developed by American rotorcraft company Vertol and now manufactured by Boeing Defense, Space & Security. The Chinook is a heavy-lift helicopter that is among the heaviest lifting Western helicopters.

The Bell 212 (also known as the Bell Two-Twelve) is a two-blade, twin-engine, medium helicopter that first flew in 1968. Originally manufactured by Bell Helicopter in Fort Worth, Texas, United States, production was moved to Mirabel, Quebec, Canada in 1988, along with all Bell commercial helicopter production after that plant opened in 1986. [2 ...

A tandem-rotor aircraft is an aircraft with two large helicopter rotor assemblies mounted one in front of the other in the horizontal plane. This configuration is mainly used for large cargo helicopters. [1]

The AH-64 Apache, manufactured by Boeing, is a twin-engine, multi-mission, heavy division attack helicopter with two four-bladed rotors (one main and one tail). The Army utilizes the Apache for precision strike and armed reconnaissance missions during …

2021年6月27日 · Most intermeshing rotor helicopters have two blades per rotor, but some versions, such as the Kellett XR-10 from the USA, have 3 blades per rotor. Intermeshing helicopters are known for their stability and the heavy loads they can transport, even though the angled rotors lose some of their lift capability in this configuration.

A fully articulated rotor is found on aircraft with more than two blades and allows movement of each individual blade in three directions. In this design, each blade can rotate about the pitch axis to change lift; each blade can move back and forth in plane, lead and lag; and flap up and down through a hinge independent of the other blades.

Single-rotor helicopters are by far the most common type of helicopter in use today. They have one main rotor located directly above the cockpit for vertical lift and—when tilted—provides forward motion. This main rotor can have anywhere from 2 blades (as pictured above) to 7 blades, as you’ll find on the Sikorsky Sea Stallion.

Helicopters have between 2 and 8 main rotor blades. The larger the helicopter, the heavier it weighs and needs more lift to be produced. By using more blades, designers can increase the entire rotor system surface area while keeping the size of each rotor blade as small as possible.

The Bell 212 Twin Two-Twelve is a two-bladed, twin-engined, medium helicopter developed from the Bell 205 ( Huey ) powered by a, then revolutionary, Pratt & Whitney Canada Twin-Pac engine made up of two coupled PT6 power turbines driving a common gearbox.