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Intermeshing rotored helicopters have high stability and powerful lifting capability. The latest Kaman K-MAX model is a dedicated sky-crane design used for construction work, and has been modified for trials by the USMC as an optionally-unmanned cargo transporter. Unmanned aerial vehicles with intermeshing rotors have also been flown. [2]
The tail rotor is a smaller rotor mounted so that it rotates vertically or near-vertically at the end of the tail of a traditional single-rotor helicopter. The tail rotor's position and distance from the center of gravity allow it to develop thrust in a direction opposite that of the main rotor's rotation, thereby countering the torque effect ...
Piasecki Helicopter – acquired by Boeing and became Boeing Vertol [39] Revolution Helicopter Corporation (defunct) – went out of business in November 1999; Robinson Helicopter [18] RotorWay International – produces kit helicopters [28] Sikorsky Aircraft [56] Schweizer Aircraft – acquired by Sikorsky Aircraft in 2004 and closed down in ...
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.
The Rotorfly R-30 helicopter is a coaxial helicopter with two two-blade fiberglass rotors. The control rods of the upper main rotor are located inside the shaft which reduces turbulence, It has been described as a hingeless teetering blade mount. [2] The aircraft claimed to be very quiet in general. [5]
Tail rotor blades can be made with both symmetrical and asymmetrical airfoil construction. The pitch change mechanism uses a cable control system or control tubes that run from the anti-torque pedals in the cockpit to a mechanism mounted on the tail rotor gearbox. In larger helicopters, the pitch change mechanism is augmented by a hydraulic ...
For storage, the V-22's rotors fold in 90 seconds and its wing rotates to align, front-to-back, with the fuselage. [111] Because of the requirement for folding rotors, their 38-foot (12 m) diameter is 5 feet (1.5 m) less than would be optimal for an aircraft of this size to conduct vertical takeoff, resulting in high disk loading. [108]
An aircraft with a cycloidal rotor wing is called a cyclogyro. Some examples are hybrids comprising a cycloidal rotor around a central Magnus cylinder. Cross-flow fan: a slatted cylindrical fan in a shaped duct. Longitudinal horizontal-axis. Radial-lift rotor: a substantially fore-aft axis rotor which creates lift through cyclic pitch variation.