Gourt > Science > Technology > Aerospace > Aeronautics > Helicopters (3)
A helicopter is an aircraft which is lifted and propelled by one or more horizontal rotors. Helicopters are classified as rotary-wing aircraft to distinguish them from conventional fixed-wing aircraft. The word helicopter is derived from the Greek words helix (spiral) and pteron (wing). The first single-rotor, fully-controllable helicopter to enter large full-scale production was made by Igor Sikorsky in 1942.
Compared to conventional fixed-wing aircraft, helicopters are much more complex, more expensive to buy and operate, and are more limited in speed, range, and payload. The compensating advantage is maneuverability: helicopters can hover in place, reverse, and above all take off and land vertically. Subject only to refueling facilities and load/altitude limitations, a helicopter can travel to any location, and land anywhere with enough space (approximately twice the area of the rotor disk).
Compared to other vertical lift aircraft like tiltrotors (V-22 Osprey for example) and vectored thrust airplanes (AV-8 Harrier for example), helicopters are very efficient, carrying more than twice the payload, consuming less fuel in hover and costing considerably less to buy and operate. However these other configurations have a much higher cruise speed than a helicopter (270 km/h for a helicopter, 460 km/h for a tiltrotor, 900+ km/h for a vectored thrust airplane).
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The nickname of rescue helicopters in North Wales is 'Tacsi sais', meaning English Taxi. Very accurate in this case: http://xrl.in/43fk
aluneurig (Alun Eurig Williams) Thu, 24 Dec 2009 10:01:50 -0000
The nickname of rescue helicopters in North Wales is 'Tacsi sais', meaning English Taxi. Very accurate in this case: http://xrl.in/43fk
HobbyPartz.com: Get 5% OFF LiPo Batteries for RC Helicopters, Airplanes, Cars and Boats http://bit.ly/4DzpXg
xbitbird (Twitt3rBird) Thu, 24 Dec 2009 10:00:33 -0000
HobbyPartz.com: Get 5% OFF LiPo Batteries for RC Helicopters, Airplanes, Cars and Boats http://bit.ly/4DzpXg
web head: Come summer, there may be far fewer helicopters flying overhead, and those that are could be at much .. http://bit.ly/84nBc6
northshoresun (North Shore Sun) Thu, 24 Dec 2009 09:36:51 -0000
web head: Come summer, there may be far fewer helicopters flying overhead, and those that are could be at much .. http://bit.ly/84nBc6
Photo: OV-1D Mohawk at Rammstein I really donât care about jet fighters and apache helicopters, and all that... http://tumblr.com/xao4xl80v
Myfstyc (Myf McGriff) Thu, 24 Dec 2009 09:29:31 -0000
Photo: OV-1D Mohawk at Rammstein I really don’t care about jet fighters and apache helicopters, and all that... http://tumblr.com/xao4xl80v
Budget grounds Colorado Springs police helicopters - The Denver Post http://ow.ly/Pd1F
jimwoods09 (Jim Woods) Thu, 24 Dec 2009 08:45:21 -0000
Budget grounds Colorado Springs police helicopters - The Denver Post http://ow.ly/Pd1F
what a crazy flippin night!!!! cops, gunfire, wrecked police cars and helicopters... my phone is dead. i will talk to u â¦http://lnk.ms/3Zrr4
StReEtR8rGiRl (Melinda Leake) Thu, 24 Dec 2009 08:40:46 -0000
what a crazy flippin night!!!! cops, gunfire, wrecked police cars and helicopters... my phone is dead. i will talk to u …http://lnk.ms/3Zrr4
Boeing Sikorsky RAH-66 Stealth Comanche Helicopter - Information on the RAH-66 Stealth Comanche helicopter and the stealth technology used in it.
Helicopter Aviation - This site deals with the aerodynamics of helicopters, instruction on how to fly helicopters, mechanical components, and helicopter maneuvers.
How Helicopters Work - Photos and many brief videos in this narrative help to describe helicopter controls, capabilities and complexity.
Meta Description: [ A helicopter is the most versatile flying machine in existence today -- it has the amazing ability to fly in 3-D. Find out how it accomplishes this feat and a bunch of other cool tricks. ]
Hummingbird Project - Hummingbird is a small research helicopter, at Stanford University's Aerospace Robotics Laboratory, which navigates using an integration of the Global Positioning System with computer vision.
Meta Description: [ HUMMINGBIRD is a small autonomous research helicopter which navigates using an intergration of the Global Positioning System with computer vision. ]
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Low Speed Aerodynamics Research Group, University of Glasgow - Conducts wind tunnel research on topics including the aerodynamics of helicopter rotor blades. Includes facility descriptions, profiles of current projects, and some online data.
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Swiss Helicopters by Markus Herzig - News and information about helicopters of Switzerland.
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