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Rotation of helicopter rotors by action of wind resistance rather than engine power
Autorotation is a state of flight in which the main rotor system of a helicopter or other rotary-wing aircraft turns by the action of air moving up through
Autorotation
Rotorcraft with unpowered rotor
gyrocopter, is a class of rotorcraft that uses an unpowered rotor in free autorotation to develop lift. A gyroplane "means a rotorcraft whose rotors are not
Autogyro
Heavier-than-air aircraft with rotating wings
uses an unpowered rotor, driven by aerodynamic forces in a state of autorotation to develop lift, and an engine-powered propeller, similar to that of
Rotorcraft
Safety diagram in aviation
because it may be impossible for the pilot to complete an emergency autorotation from a starting point within these regions. The H/V curve also contains
Helicopter height–velocity diagram
Helicopter_height–velocity_diagram
Direct use or generation of wind energy
axis traverse to the wind so that Magnus-effect lift obtains during autorotation; the electricity is generated with end-hub generators. The LTA Windpower
Airborne_wind_energy
Helicopter crash killing Troy Gentry
the pilot shut off the engine and initiated a power-off descent under autorotation from approximately 950 feet (290 m) above ground level; however, as the
2017 New Jersey helicopter crash
2017_New_Jersey_helicopter_crash
American actor (born 1942)
on a routine training flight. While making his second attempt at an autorotation with powered recovery, the aircraft was unable to recover power after
Harrison_Ford
Lighter-than-air aircraft
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Aerostat
Aircraft in or near a stall rolling
For fixed-wing aircraft, autorotation is the tendency of an aircraft in or near a stall to roll spontaneously to the right or left, leading to a spin (a
Autorotation (fixed-wing aircraft)
Autorotation_(fixed-wing_aircraft)
Aviation term for a corkscrew downward path
flight dynamics, a spin is a special category of stall resulting in autorotation (uncommanded roll) about the aircraft's longitudinal axis and a shallow
Spin_(aerodynamics)
Argentinian engineer, lawyer and inventor
successfully utilize cyclic pitch, as well as pioneering the use of autorotation for the safe landing of a damaged helicopter. Pescara also set a world
Raúl_Pateras_Pescara
Special vehicle to fly in air just above sea or ground
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Ground-effect_vehicle
Type of rotorcraft
from the engine so that the rotors can continue spinning and perform autorotation. Helicopter clutches are usually freewheel clutches relying on centrifugal
Helicopter
American helicopter model
the R22 to enter autorotation and land in a controlled manner. Because the main rotor has very little mass and inertia, autorotation in an R22 requires
Robinson_R22
Instruments used in helicopter flight
basic flight conditions for a helicopter: hover, forward flight and autorotation. Some pilots consider hovering the most challenging aspect of helicopter
Helicopter_flight_controls
Powered aircraft with wings
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Airplane
Type of VTOL aircraft
referred to as "gyrodyne", between a rotaplane (with the rotor free for autorotation and an upward total axial flow through the rotor disc), on the one hand
Gyrodyne
Powered lighter-than-air aircraft
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Airship
Tethered aircraft
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Kite
Aircraft type
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Tiltrotor
Type of aircraft used in the sport of gliding
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Glider_(sailplane)
Heavier-than-air aircraft with fixed wings generating aerodynamic lift
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Fixed-wing_aircraft
1930s Italian fighter aircraft
a dangerous tendency to spin. Early production C.200 aircraft showed autorotation problems similar to those found in the Fiat G.50 Freccia, IMAM Ro.51
Macchi_C.200_Saetta
Helicopter system designed to be worn on a person's back
simplicity; this means, however, that in the event of engine failure autorotation is impossible. Usually, a ballistic parachute would be incorporated for
Backpack_helicopter
Landing of aircraft or spacecraft with greater speed and force than in a normal landing
damage or failure when the rotor(s) are still intact and free to turn. Autorotation, in which airflow over the rotors keeps them turning and provides some
Hard_landing
Bristow Helicopters Flight 56C, forcing the crew to perform an emergency autorotation to a ditching in the sea. Despite the rough sea conditions, the 16 oil
List_of_Mayday_episodes
Early autogyro built by Juan de la Cierva
rotors. Despite its failure to fly, the C.1 demonstrated the principle of autorotation in a full-sized aircraft for the first time, as it was taxied around
Cierva_C.1
First practical, functional helicopter, first flown in 1936
flown for its first flight. On 10 May 1937, it accomplished its first autorotation landing with the engine turned off. Focke-Achgelis began work on a two-seat
Focke-Wulf_Fw_61
Movement of an object which leaves at least one point unchanged
passing through the body's own center of mass is known as a spin (or autorotation). In that case, the surface intersection of the internal spin axis can
Rotation
Aircraft which use flapping movement of the wings to generate lift
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Ornithopter
British punk rock band
vocals, Clive Giblin (of Alternative TV) on guitar and Igor Olejar (of Autorotation) on drums. In a November 2017 interview with Louder Than War, Wakeford
Crisis_(punk_band)
2013 fatal helicopter accident in Scotland
prescribed by emergency checklists, and a failure to achieve a successful autorotation after both engines failed were cited as additional causal factors. The
2013_Glasgow_helicopter_crash
Twin-engine tiltrotor VTOL aircraft
certification flights. In early summer 2014, the AW609 performed FAA-monitored autorotation tests. More than 79 power-off conversions from airplane mode to helicopter
Leonardo_AW609
Military transport tiltrotor
evaluated its cost per flight hour at $23,941. While technically capable of autorotation if both engines fail in helicopter mode, a safe landing is difficult
Bell_Boeing_V-22_Osprey
Unmanned autogyro manufactured in the Czech Republic
flights due to safety reasons. Another important feature of autogyro is an autorotation safety mode that enables a controlled (slow) descent even in the event
ThunderFly_TF-G2
2009 French light helicopter
carburetor ice-protection system, crash-resistant fuel tank, and exceptional autorotation capabilities. During development, the safety, security, longevity aspects
Guimbal_Cabri_G2
One-way mechanical transmission device
continue rotating faster than the engine so that the helicopter can enter autorotation. A sprag clutch is used in the electric starter motors of modern motorcycle
Sprag_clutch
Helicopter crash killing Francis Gary Powers
prepared to auto-rotate down to an open area. The Bell 206 has superior autorotation characteristics, but as he descended, it is surmised that Powers saw
1977_Encino_helicopter_crash
Aircraft using a Flettner rotor
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Flettner_airplane
Vehicle or machine that can fly by gaining support from the air
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Aircraft
Helicopter crash near Warsaw
Warsaw. Following the failure of both engines, the pilot performed an autorotation landing in a forest. The helicopter suffered extensive damage and was
2003 Polish Air Force Mil Mi-8 crash
2003_Polish_Air_Force_Mil_Mi-8_crash
Light helicopter, French, 1973–present
The main rotor is described as having a "wide range of tolerance" for autorotation. The Gazelle is capable of transporting up to five passengers and up
Aérospatiale_Gazelle
US Navy Helicopter Attack Squadron (Light) 3
causing irreparable structural damage. On 7 April during a practice autorotation at Cà Mau a UH-1B crashed and was destroyed. On 19 April a UH-1B received
HA(L)-3
Medium utility helicopter
Brazilian-registered Airbus Helicopters H160B crashed in the South Atlantic. Using an autorotation maneuver, the pilot successfully made an emergency water landing, activating
Airbus_Helicopters_H160
Type of aerostat that remains aloft due to its buoyancy
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Balloon_(aeronautics)
Unpowered rotary wing aircraft or kite
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Rotor_kite
Appendage used for flight
propel through water. Wing forms in nature Winged tree seeds that cause autorotation in descent A laughing gull, exhibiting the "gull wing" outline. Bat in
Wing
so tend to have a higher Lock number. A low Lock number gives good autorotation characteristics due to higher inertia, however this comes with a mass
Lock_number
1981 helicopter accident
power to the main rotor gearbox, going out of control during the ensuing autorotation and crashing into the North Sea. The flight was carrying 11 gas workers
1981 Bristow Helicopters Westland Wessex crash
1981_Bristow_Helicopters_Westland_Wessex_crash
Swiss light helicopter
attitude of the aircraft, and expanding the flight envelope, including autorotation tests and being flown to 97 per cent of its maximum internal load takeoff
Kopter_AW09
Aircraft landing made in response to a crisis
If there is a suitable landing spot within the aircraft's gliding or autorotation distance, an unplanned landing will often result in no injuries or significant
Emergency_landing
Tab on the trailing edge of a wing
horizontal stabilizer can be as high as −25°; at the other extreme, in autorotation, it may be +15°. As a result, at least half of all modern helicopters
Gurney_flap
Utility helicopter
flight, which led to an inadvertent record being set for the longest ever autorotation after which the rotorcraft was brought to a safe unpowered landing. Days
Aérospatiale_SA_315B_Lama
Prototype French electric helicopter
assisted, emergency landing capabilities as an alternative to forced autorotation straight to the ground. Both technologies are expected to greatly improve
Solution F/Chretien Helicopter
Solution_F/Chretien_Helicopter
Jet nozzle at the tip of some helicopter rotor blades
hence permitting it to store energy, which makes performing a successful autorotation landing somewhat easier. However, the tip jet also typically generates
Tip_jet
Aerodynamic condition related to helicopter flight
airflow. In these cases, the pilot's only recourse may be to enter an autorotation to break the rotor system free of its vortex ring state. In a tandem
Vortex_ring_state
1995 helicopter accident in the North Sea
were still working and the pilots were forced to perform an emergency autorotation onto the rough seas. Emergency flotation devices on the helicopter allowed
Bristow Helicopters Flight 56C
Bristow_Helicopters_Flight_56C
Aircraft
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Kytoon
Hot air balloon attached to the ground
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Tethered_balloon
Type of forced landing of an aircraft
result in substantial damage. With helicopters, a forced landing involves autorotation, since the helicopter glides by allowing its rotor to spin freely during
Deadstick_landing
Helicopter in Nazi Germany
series. In case of an engine failure, the switch from helicopter to autorotation was automatic. Three-bladed rotors were installed on a test bed and found
Flettner_Fl_282
Mobile phone model
to run processes such as Windows Live Messenger. The phone supports autorotation for portrait to landscape via the built-in accelerometer, which is also
Sony_Ericsson_C510
Phase of aerodynamic flight
of a climb. It may also occur during an excessively rapid entry into autorotation. This can have a disastrous effect on the aircraft, particularly in the
Low-g_condition
Mode of flight
volcanic ash ~15 Paraglider High performance model 11 Helicopter in autorotation 4 Powered parachute with a rectangular or elliptical parachute 3.6/5
Gliding_flight
Type of wind turbine that spins along its vertical axis
and products that use the net lift Magnus effect that occurs in the autorotation of the Savonius rotor. The spin may be mined for some of its energy for
Savonius_wind_turbine
was the lack of suitable terrain for the pilot to execute a successful autorotation. 2007-07-27 Phoenix, Arizona, United States KNXV-TV and KTVK Two Eurocopter
List of news aircraft accidents and incidents
List_of_news_aircraft_accidents_and_incidents
Aircraft with a rotating wing for takeoff and landing
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Tiltwing
Topics referred to by the same term
motion in special relativity and general relativity Spin (aerodynamics), autorotation of an aerodynamically stalled aeroplane SPIN bibliographic database,
Spin
1983 film by John Badham
206s. After Murphy incapacitates the first one, forcing it to land via autorotation, he engages in a cat-and-mouse chase with the second by slaloming down
Blue_Thunder
Type of vertical-axis wind turbine
rotor are equivalent to that in autogyros, and normal helicopters in autorotation. As the aerofoil moves around the back of the apparatus, the angle of
Darrieus_wind_turbine
Type of airfoil
and both engines must be stopped prior to an emergency landing. The autorotation characteristics are poor partly due to the rotors' low inertia. Bell
Proprotor
Any period of time during an aircraft's flight when its altitude decreases
which lose power do not simply fall out of the sky. In a maneuver called autorotation, the pilot configures the rotors to spin faster driven by the upward
Descent_(aeronautics)
Aircraft designed for operation without an engine
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Glider_(aircraft)
American small helicopter design
there is considerable inertia in the system during a loss of power. Autorotation landings are uneventful. 480 Five-seat civil version based on the Enstrom
Enstrom_480
Aerial vehicle capable of sustaining flight without onboard propulsion
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Unpowered_aircraft
Type of experimental helicopter
for the first time, to transition from powered rotary-wing flight to autorotation and back again, making it the safest helicopter of its time. In contrast
Flettner_Fl_265
Foot-launched powered hang glider
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Powered_hang_glider
Single-engine single-rotor light military helicopter
ensured that the system had enough inertia due to flight as well, so autorotation would function in case of engine failure. A single 260 hp Lycoming VO-435
Bell_H-13_Sioux
Helicopter model
crash was attributed to the pilot's loss of control during a power-off autorotation landing attempt; a contributing factor was failure of the throttle control
Schweizer_S300
Experimental compound helicopter
(12,500 ft) Rate of climb: 28 m/s (5,500 ft/min) Tip speed: 0.91 Mach Autorotation: 2,800 f.p.m Aviation portal Fairey Rotodyne Related development Eurocopter
Eurocopter_X³
Spanish engineer and count (1895–1936)
reach flying speed was necessary, while tilting the rotor to establish autorotation. Another approach was to tilt the tail stabiliser to deflect engine slipstream
Juan_de_la_Cierva
1959 experimental VTOL aircraft model
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Avro_Canada_VZ-9_Avrocar
VTOL aircraft with ducted fan fuselage
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Coleopter
US experimental co-axial compound helicopter
207 mph) level flight, it could enter a 1.4 g bank turn with the rotor in autorotation, increasing rotor rpm. Airframe stress prevented rotor speed reduction
Sikorsky_S-69
Characteristic of rotors/propellers
will require more engine power to hover. A low disk loading improves autorotation performance in rotorcraft. Typically, an autogyro (or gyroplane) has
Disk_loading
Type of VTOL aircraft
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Tail-sitter
American ultralight helicopter
and the ramjet tips were extremely noisy. In the event of power loss, autorotation was found to be difficult due to the drag from the ramjet nacelles. The
Hiller_YH-32_Hornet
Engine where combustion is pulsed instead of continuous
pulsejets and the fact that the drag of the pulsejets at the rotor tips made autorotation landings very problematic. Rotor-tip propulsion has been claimed to reduce
Pulsejet
Type of rocket pack
airplanes and helicopters, which can land safely without power by gliding or autorotation. All existing rocket packs are based on the construction of the "Bell
Bell_Rocket_Belt
Abrupt reduction in lift due to flow separation
angle of attack of the wings is beyond the stall, a spin, which is an autorotation of a stalled wing, may develop. A spin follows departures in roll, yaw
Stall_(fluid_dynamics)
tested successfully by hand launching, but suffered buffeting and lack of autorotation when launched from aircraft at height. The third evolution, designated
Hafner_Rotachute
Aircraft component
was a EC120 that cut off its own tail during a hard landing caused by autorotation practice. Helicopters can be vulnerable to a tail boom striking its surroundings
Helicopter_rotor
Airport
practicing autorotations. The probable cause of the accident was found to be the pilot's failure to maintain rotor rpm during a practice autorotation, which
Jacksonville Executive at Craig Airport
Jacksonville_Executive_at_Craig_Airport
South African airline
Executive Producer's wife and son, and an assistant on board. A successful autorotation was performed to a dry riverbed. There were no injuries and damage was
Command Airways (South Africa)
Command_Airways_(South_Africa)
Italian helicopter
fuel or biodiesel. The design has an electrical power system to aid autorotation in the event of main engine loss in flight which is called H.A.S.- Hybrid
Konner_K1
Small utility helicopter
that there was potential for vibration-induced rotor cracking during autorotation training, shortening the life of the main rotor. 13 EC135 trainers have
Eurocopter_EC135
French aviator (1920–2011)
performed the highest ever full touch down autorotation, landing with absolutely no power. This high altitude autorotation also set a new world record. Because
Jean_Boulet_(aviator)
Partially aero-static aircraft
rotor Unpowered free flight (Free) balloon Glider Helicopter, etc. in autorotation (None – see note 2) Tethered (static or towed) Tethered balloon Kite
Hybrid_airship
Focke-Wulf Fw 61 helicopter makes the first landing for an Fw 61 using autorotation. May 22 – The Spanish Republican Air Force sends fighters on a risky
1937_in_aviation
Experimental tiltrotor aircraft to explore convertiplane technologies
envelope to 127 miles per hour (204 km/h) as well as demonstrating full autorotation landings and 30-degrees forward transitions with the rotor pylons. On
Bell_XV-3
AUTOROTATION
AUTOROTATION
AUTOROTATION
AUTOROTATION
Girl/Female
Hindu, Indian
One with Beautiful Eyes
Girl/Female
Hindu, Indian
One of the Indian Raag or Taal
Girl/Female
Indian, Tamil
Person who Succeed in Everything
Surname or Lastname
English
English : unexplained.
Boy/Male
Sikh
Singer of gods praise
Girl/Female
Arabic, Australian, Muslim
A Woman who Abstains; Captivating
Boy/Male
Indian, Sanskrit
Unexpressed; Unsaid
Girl/Female
Hindu
Deers eye, Of the earth
Girl/Female
Indian
One of the four Vedas, Blessing
Boy/Male
Muslim/Islamic
Sura in Quran
AUTOROTATION
AUTOROTATION
AUTOROTATION
AUTOROTATION
AUTOROTATION