Search results
Results From The WOW.Com Content Network
A Bell 47 helicopter, an early example of a powered rotorcraft. A rotary-wing aircraft, rotorwing aircraft or rotorcraft is a heavier-than-air aircraft with rotary wings that spin around a vertical mast to generate lift. The assembly of several rotor blades mounted on a single mast is referred to as a rotor.
He had developed a small helicopter model with coaxial rotors in July 1754 and demonstrated it to the Russian Academy of Sciences. [1] In 1859, the British Patent Office awarded the first helicopter patent to Henry Bright for his coaxial design. From this point, coaxial helicopters developed into fully operational machines as we know them today ...
However, the rear rotor works in the aerodynamic shadow of the front rotor, which reduces its efficiency. This loss can be minimized by increasing the distance between the two rotor hubs, and by elevating one hub over the other. [4] [5] Tandem-rotor helicopters tend to have a lower disk loading than single-rotor helicopters. [6]
The Bell 407 is a four-blade, single-engine, civil utility helicopter. A derivative of the Bell 206L-4 LongRanger, the 407 uses the four-blade, soft-in-plane design rotor with composite hub developed for the United States Army's OH-58D Kiowa Warrior instead of the two-blade, semi-rigid, teetering rotor of the 206L-4.
Data from MD500E Performance Specifications, The International Directory of Civil Aircraft General characteristics Crew: 2 Capacity: 3 passengers Length: 32 ft 7 in (9.93 m) Height: 8 ft 9 in (2.67 m) Empty weight: 1,591 lb (722 kg) Max takeoff weight: 3,550 lb (1,610 kg) Powerplant: 1 × Allison 250-C30 turboshaft engine, 650 shp (480 kW) Main rotor diameter: 27 ft 4 in (8.33 m) Main rotor ...
The differences between the CH-47J and the CH-47D are the engine, rotor brake and avionics, for use for general transportation, SAR and disaster activity like U.S. forces. [122] The CH-47JA, introduced in 1993, is a long-range version of the CH-47J, fitted with an enlarged fuel tank, an AAQ-16 FLIR in a turret under the nose, and a partial ...
A year and a half later Boeing sold the civilian line of helicopters to MD Helicopter Holdings Inc., an indirect subsidiary of the Dutch company, RDM Holding Inc. By December 2006 Columbia Helicopters of Aurora, Oregon had purchased the Type certificate of the Boeing Vertol 107-II and Boeing Model 234 Commercial Chinook from Boeing.
The 206L LongRanger is a stretched variant with seating for seven. The fuselage, stretched a total of 30 inches (760 mm), adds two rear-facing seats between the front and rear seats. Since 1975, Bell has produced more than 1,700 LongRangers across all variant types. In 1981, a military version, the 206L TexasRanger was released.