Dual propeller helicopter

Helicopters are an especially fascinating aircraft that capture the imagination of everyone from wide-eyed toddlers to grizzled military veterans.

A helicopter is a heavier-than-air aircraft supported in flight chiefly by the reactions of the air on one or more power driven rotors. A gyroplane is a heavier-than-air aircraft supported in flight by the reactions of the air on one or more rotors which rotate freely. A rotor provides lift, which can be employed to keep the aircraft airborne and to provide thrust. A rotor can also counteract torque tail rotors. Single main rotor helicopters are the most common type of helicopter They need an anti-torque device tail rotor or other anti-torque system to counteract the twisting momentum produced by the main rotor, which is powered by one or more engine s. In a single main rotor helicopter part of the power generated by the powerplant s is employed to counteract torque. The most common anti-torque device is a tail rotor, which is designed to compensate the torque produced by the main rotor.

Dual propeller helicopter

A tandem-rotor aircraft is an aircraft with two large helicopter rotor assemblies mounted one in front of the other in the horizontal plane. Currently this configuration is mainly used for large cargo helicopters. Single-rotor helicopters need a mechanism to neutralize the yawing movement produced by the single large rotor. Tandem-rotor helicopters, however, use counter-rotating rotors , with each cancelling out the other's torque. Therefore, all of the power from the engines can be used for lift , whereas a single-rotor helicopter uses some of the engine power to counter the torque. The first successful tandem-rotor helicopter was built by Nicolas Florine in Advantages of the tandem rotor system are a larger center of gravity range and good longitudinal stability. Disadvantages of the tandem rotor system are a complex transmission [1] and the need for two large rotors. The two rotors are linked by a transmission that ensures the rotors are synchronized and do not hit each other, even during an engine failure. Tandem-rotor designs achieve yaw by applying opposite left and right cyclic to each rotor, effectively pulling both ends of the helicopter in opposite directions.

India Today. Retrieved 19 August

This machine, which is made by Sikorsky and Boeing, is competing with a rival aircraft from Bell as part of an Army initiative called the Future Long-Range Assault Aircraft program. The winner should be announced in Right away, its appearance sets it apart from a regular helicopter. The most eye-catching feature is at the top, where two stacked rotors spin in opposite directions for maximum lift. That double-rotor setup also solves a problem that is a nerdy—yet fascinating—aerodynamic issue. Picture a regular helicopter cruising quickly through the air. As the top rotor spins, one side of the rotor is traveling forward in the same direction of flight, while the other side is moving backwards, as the blades complete their circle.

The Chinook is a heavy-lift helicopter that is among the heaviest lifting Western helicopters. The Chinook was originally designed by Vertol, which had begun work in on a new tandem-rotor helicopter, designated as the Vertol Model or V Around the same time, the United States Department of the Army announced its intention to replace the piston-engine —powered Sikorsky CH Mojave with a new, gas turbine —powered helicopter. During June , the U. Army ordered a small number of Vs from Vertol under the YHC-1A designation; following testing, some Army officials considered it to be too heavy for the assault missions and too light for transport purposes. Marine Corps as the CH Sea Knight , the Army sought a heavier transport helicopter, and ordered an enlarged derivative of the V with the Vertol designation Model Initially designated as the YCH-1B , on 21 September , the preproduction rotorcraft performed its maiden flight. The Chinook possesses several means of loading various cargoes, including multiple doors across the fuselage, a wide loading ramp located at the rear of the fuselage and a total of three external ventral cargo hooks to carry underslung loads. Improved and more powerful versions of the Chinook have also been developed since its introduction; one of the most substantial variants to be produced was the CHD, which first entered service in ; improvements from the CHC standard included upgraded engines, composite rotor blades, a redesigned cockpit to reduce workload, improved and redundant electrical systems and avionics, and the adoption of an advanced flight control system.

Dual propeller helicopter

Do you find yourself drawn to military helicopters? And if you want to learn more about their capabilities and uses, look no further! In this blog post, we give an overview of the eight different types of military helicopters and provide 16 examples as well. Helicopters are among the most adaptive and versatile weapons system worldwide. Helicopters are integral during times of war and peace.

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The Chinook was originally designed by Vertol, which had begun work in on a new tandem-rotor helicopter, designated as the Vertol Model or V ISSN The MHE has been used by U. Archived from the original on 4 June Vietnam Studies: Airmobility — The Illustrated Encyclopedia of Helicopters. The Chinook is a heavy-lift helicopter that is among the heaviest lifting Western helicopters. Helicopter Safety. Wikimedia Commons. Please help improve this article by adding citations to reliable sources in this section. Kamov Ka Archived from the original on 2 May The helicopter will yaw to the left if the clock wise rotating rotor produces more lift, and it will yaw to the right if more lift is produced by the counter-clock wise rotating rotor. Technology Military Army. Unlike a traditional helicopter, they utilize an additional propulsion method—typically either a tail-mounted propeller or a jet engine—to achieve increased air speeds.

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

Improvements from the CHC included upgraded engines, composite rotor blades, a redesigned cockpit to reduce pilot workload, improved and redundant electrical systems, an advanced flight control system, and improved avionics. Arlington National Cemetery site. It is capable of higher speeds that a normal helicopter. Special Forces and other international operators. Archived from the original on 25 October Archived PDF from the original on 9 October Despite the age of the Chinook, it is still in heavy demand, in part due its proven versatility and ability to operate in demanding environments such as Afghanistan. The Army finally settled on the larger Chinook as its standard medium-transport helicopter, and by February , aircraft had been delivered to the Army. The Chinook was originally designed by Vertol, which had begun work in on a new tandem-rotor helicopter, designated as the Vertol Model or V Retrieved 11 August Compound helicopters effectively combine the best features of airplanes and helicopters. During the Iran—Iraq War , Iran made heavy use of its US-bought equipment, and lost at least eight CHs during the — period, most notably during a clash on 15 July , when an Iraqi Mirage F1 destroyed three Iranian Chinooks transporting troops to the front line, and on 25—26 February , when Iraqi MiG fighters shot down two examples. Categories : Aircraft first flown in Boeing military aircraft Kawasaki Aerospace Company Military transport helicopters United States military helicopters Tandem rotor helicopters s United States military transport aircraft s United States helicopters Twin-turbine helicopters.