Rotorcraft
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Rotor Configuration
When the engine developed enough power to lift the helicopter, the main problem was how to counter the main rotor forcing the fuselage to rotate in the opposite direction of the rotor. This effect is known as Torque.
Rotors
A rotor is a large closed eddy that forms in the lee of a mountain or obstacle and represent an area of severe turbulence. Up and down draughts are measured in excess of 5000 ft/m, avoid them when possible! ...
Rated 2-minute OEI Power , with respect to rotorcraft turbine engines, - 14 CFR 1.1
Rated 30-minute OEI power , with respect to rotorcraft turbine engines, - 14 CFR 1.1 ...
rotor waves - An altocumulus cloud formation that can be found in the lee of a mountain or similar barrier. The air rotates around a horizontal axis, creating turbulence.
ROTORCRAFT - A heavier-than-air aircraft that depends principally for its support in flight on the lift generated by one or more rotors. Includes helicopters and gyroplanes.
Rotor: A narrow aerofoil rotating in approximately a horizontal plane about a common axis (like the spokes of a wheel) which produces lift corresponding to the normal fixed wings of an aeroplane.
Aft Rotor Tilt
The number of degrees the rotor disk is tilted aft in reference to the longitudinal reference line thru the model. Generally this is referring to the neutral or zero trim position of the disk.
AGL ...
Tail Rotor Aerodynamics
Tail rotors share many of the aerodynamics of the helicopter main rotor system.
Tail Rotor Dissymmetry of Lift
The tail rotor experiences dissymmetry of lift during forward flight, because it also has advancing and retreating blades. Dissymmetry is corrected for by a flapping hinge action.
Early Rotor System Design
Early helicopter designers must have been really frustrated guys. It seems like it should be so simple.
Tilt rotor.
An aircraft with tilting rotors for fixed-wing flight or rotary-wing flight; ...
ROTOR - The rotating-wing assembly of an autogyro or helicopter, comprising the rotor hub and rotor blades.
RPV - Remotely piloted vehicles, directed usually by radio by a pilot in another aircraft or based on the ground.
A rotorcraft propelled by a horizontal thrust system such as a propeller and lifted by an unpowered rotor free to spin under the action of the air flowing through its disc from below
AWACS
Airborne Warning and Control System ...
A rotorcraft that, for its horizontal motion, depends principally on its engine-driven rotors.
Installation ...
No Tail Rotor
On-Route Status, and other hazy ATC concepts
released for climb ...
Replace Main Rotor Blade
1
Unscrew the fastener screw that holds the main rotor blades to the axle.
AUTOROTATION- A rotorcraft flight condition in which the lifting rotor is driven entirely by action of the air when the rotorcraft is in motion.
LTE: Loss of Tail Rotor Effectiveness in helicopters. A low speed aerodynamic characteristic that can result in an uncommanded rapid yaw rate that does not subside of its own accord. Also known as 'unanticipated yaw' or 'loss of tail rotor authority'.
The two-blade tail rotor is driven by a single drive shaft running inside the tail boom and connected to the upper drive pulley. A bearing and dampener assembly is located at the midpoint to support the shaft and reduce vibration.
NOTAR - no tail rotor. A system patented by McDonnell Douglas for maintaining directional control of helicopters without use of an anti ...
Ratings are more complex than this limited explanation -- for example, Rotorcraft come in two flavors, Helicopter and Gyroplane; Lighter-than-Air aircraft come in two flavors, Free Balloon and Airship; ...
Examples include: airplane; rotorcraft; glider; and lighter-than-air; and
(2) As used with respect to the certification of aircraft, means a grouping of aircraft based upon intended use or operating limitations.
Flettner rotor ship, 3.11
Franklin, Benjamin, 11
Frisbee, 8.2, 8.8.2, 17.1.4
Frise aileron: definition, 8.8.2
fast/slow control: fallacy, 7.2.3
fast/slow control: fallacy , 7
feathering propeller, 17.2.3
finger: heads-up display, 11.5.2 ...
As intended by la Cierva, the rotor always turns regardless of the airspeed of the aircraft, though as airspeed decreases rotor rpm reduces to a minimum value at zero airspeed.
The primary advantage of a helicopter is that the rotor provides lift without the aircraft needing to move forward to generate lift. This allows the helicopter to both take off and land vertically without the need for a runway.
Still, helicopters operate to very different parameters than fixed-wing airplanes. The overhead rotor serves as the equivalent of a wing, and maintaining rotor speed is critical. Losing rotor speed is somewhat analogous to stalling an aircraft wing.
It had two rotors consisting of feathers stuck in corks and was driven by a string from a bow. The design demonstrated an understanding of how a propeller worked. It also addressed Cayley's interest in finding a means of powering an aircraft.
The wings, control surfaces, rotors, propellers, horizontal stabilizers, vertical stabilizers or any other stabilizing surface on an aircraft and, in the case of an aircraft that has rear-mounted engines, includes the upper surface of its fuselage.
Coning This effect is the bending of the rotor or propeller blades when stressed.
Control Surface Any one of the various moveable portions of the wings, tail surfaces, or canard.
An airplane's engine drives a propeller, which provides thrust to move the aircraft along so it's wings can produce lift. A helicopter's engine drives a transmission, which in turn drives the helicopter's rotors.
This can be demonstrated by observing the tight column of air behind a propeller, a household fan, or under the rotors of a helicopter, all of which are rotating wings.
PITCH (1) One of the three axes in flight, this specifies the vertical action, the up-and-down movement. (2) The angle of a propeller or rotor blade in relation to its arc; also the distance advanced by a blade in one full rotation.
The magnitude of this contribution from the duct can be significant; a theoretical result (from Theodorsen's Theory of Propellers) states that the thrust of a ducted fan with an ideal bell mouth will be equally divided between pressures on the rotor ...
Autogyro - An aircraft equipped with a rotating wing, or rotor, to sustain itself in the air, and a propeller to move forward.
AUX Fuel - Auxiliary fuel tanks.
AWACS - Airborne Warning And Control System.
 See also: Flight, Aircraft, Helicopter, Pilot, Speed
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