question: if a helicopter were to hover 12 hours without moving forward, would it be on the other side of the world?
comment: No. All of the air in the atmosphere is spinning with the Earth. If it wasn't there would constantly be very fast wind always travelling West - but there isn't. Just like how the air moves with the Earth, a helicopter moves with the air. This is a good watch which is kind of on topic (10 minutes): URL_0
passages: BULLET::::- Ok Tedi: The pot of gold
  
  BULLET::::- Ok Tedi", in Neuguinea: Nutzung und Deutung der Umwelt
  
  BULLET::::- A Small Footnote to the "Big Walk": Environment and Change among the Miyanmin of Papua New Guinea
  
  BULLET::::- "Zij en wij"
  
  BULLET::::- Flying MacArthur to victory
  
  BULLET::::- The trumpet shall sound; a study of "cargo" cults in Melanesia
  
  BULLET::::- Videofilm: Anthropology on Trial
  
  BULLET::::- Videofilms VPRO - Andere tijden (2004)
  
  Section::::External links.
  
  BULLET::::- "Kobarweng or Where is Your Helicopter?"
  
  BULLET::::- 'We didn't realize the sound was coming from above'
  
  BULLET::::- 'It comes, it goes'
  
  BULLET::::- 'Anthropologists dropped from the sky'
   Section::::Further reading.
  
  BULLET::::- Time and the Other: How Anthropology Makes Its Object.
  
  BULLET::::- Other People's Anthropologies: Ethnographic Practice on the Margins
  
  BULLET::::- Het witte hart van Nieuw-Guinea, met de Nederlandse expeditie naar het Sterrengebergte
  
  BULLET::::- First Contact: New Guinea's Highlanders Encounter the Outside World
  
  BULLET::::- Like People You See in a Dream: First Contact in Six Papuan Societies
  
  BULLET::::- West-Papua, plunder in paradise. Anti-Slavery International
  
  BULLET::::- A Cargo Movement in the Eastern Central Highlands of New Guinea
  
  BULLET::::- West Papua: The Obliteration Of A People
  
  BULLET::::- Oh, What a Blow That Phantom Gave Me!
   Section::::Flight.:Transition from hover to forward flight.
  
  As a helicopter moves from hover to forward flight it enters a state called translational lift which provides extra lift without increasing power. This state, most typically, occurs when the airspeed reaches approximately , and may be necessary for a helicopter to obtain flight.
  
  Section::::Flight.:Forward flight.
   Section::::Destinations.
  
  The following destinations were served at various times by San Francisco and Oakland Helicopter Airlines during its existence:
  
  BULLET::::- San Francisco (SFO, San Francisco International Airport)
  
  BULLET::::- San Francisco (heliport at just north of San Francisco Ferry Building)
  
  BULLET::::- San Francisco Pier 50B - (used by the hovercraft operation)
  
  BULLET::::- Oakland (OAK, Oakland International Airport)
  
  BULLET::::- Oakland, CA (heliport code JOK, roof of the Alameda County Parking Garage at )
  
  BULLET::::- Oakland, CA (10th St southeast of Fallon)
  
  BULLET::::- Berkeley, CA (heliport code JBK, north side of University Ave, about ) near the Berkeley Marina.
   BULLET::::- Oil & gas – transporting crews to and from offshore platforms
  
  BULLET::::- Passenger – VIP & corporate charter; scheduled flights from remote areas
  
  BULLET::::- Photography – aerial photography, archaeology, film production, photogrammetry, television news reporting
  
  BULLET::::- Science – water sampling, wildlife monitoring, snow radar, support to research stations in the Arctic and Antarctic
  
  BULLET::::- Search & rescue – air-sea rescue, mountain rescue
  
  BULLET::::- Surveillance – border control, coast guard, police
  
  BULLET::::- Survey – aeromagnetic, mineral exploration, reflection seismology
  
  BULLET::::- Tourism – sightseeing tours, heliskiing
  
  Section::::Other helicopter companies.
   BULLET::::- Detachment 5, Udorn RTAFB, Thailand: 20 August 1972 - 30 September 1975
  
  BULLET::::- Detachment 5, Edwards Air Force Base, California: 1 July 1978 - 31 December 1987
  
  BULLET::::- Detachment 6 Holloman Air Force Base, New Mexico: 1 July 1978 - 31 December 1987
  
  BULLET::::- Detachment 7 Da Nang Air Base, South Vietnam: 11 December 1972 - 10 February 1973
  
  BULLET::::- Detachment 8 Takhli RTAFB, Thailand: c. Dec 1972 - 31 January 1973
  
  BULLET::::- Detachment 10 Takhli RTAFB, Thailand: 31 January 1973 - 30 July 1974
   Gaunaa, "et al." describe the physics of rotor-powered vehicles. They describe two cases, one from the vantage point of the earth and the other from the vantage point of the air stream and come to the same conclusions from both frames of reference. They conclude that (apart from forces that resist forward motion):
  
  BULLET::::- There is no theoretical upper limit to how fast a rotor-driven craft can go directly upwind.
  
  BULLET::::- Likewise, there is no theoretical upper limit to how fast a rotor-driven craft can go directly "downwind".
  
  These conclusions hold both for land and water craft.
   Munroe lives and works between Washington, DC and Nassau, Bahamas.
  
  Section::::Works.
   Papua New Guinea is one of the most heterogeneous countries in the world and has long been a favorite among anthropologists, with its more than 7000 years of agriculture, its hundreds of tribes and languages, some of whom have still not been "discovered". Beside a cultural-rich area, West Papua is also an area with considerable reserves of gold, copper, uranium, nickel, oil and natural gas which causes environmental degradation and ongoing series of human abuses.
   BULLET::::- Max wind speed allowed for operation: 70 km/h in flight, 36 km/h for take-off and landing
  
  Section::::MH-28 Gull II.
   For the 1980s, Frank D. Robinson demonstrates that a helicopter such as his remarkable Robinson R22 represent the pinnacle of point-to-point transport in a small helicopter, and the Bell XV-15 is demonstrated as the true pinnacle of the Helicopter.
   Required for wind-powered vehicle (or water craft) motion are:
  
  BULLET::::- Two masses moving with respect to each other, e.g. the air (as wind) and the earth (land or water).
  
  BULLET::::- The ability to change the velocity of either mass with a propellor or a wheel.
  
  In the case of a rotor-powered vehicle, there is a drive linkage between the rotor and the wheels. Depending on one's frame of reference—the earth's surface "or" moving with the air mass—the description of how available kinetic energy powers the vehicle differs:
   In both the circumlunar case and the cislunar case, the craft can be moving generally from west to east around the Earth (co-rotational), or from east to west (counter-rotational).
  
  For trajectories in the plane of the Moon's orbit with small periselenum radius (close approach of the Moon), the flight time for a cislunar free-return trajectory is longer than for the circumlunar free-return trajectory with the same periselenum radius. Flight time for a cislunar free-return trajectory decreases with increasing periselenum radius, while flight time for a circumlunar free-return trajectory increases with periselenum radius.
   BULLET::::- "Intrepid Fox" – a whaler burned by the "Norfolk"
  
  BULLET::::- Spanish
  
  BULLET::::- "Estrella Polar" – merchant ship
  
  BULLET::::- American
  
  BULLET::::- USS "Norfolk"
  
  Section::::Series chronology.
   BULLET::::- 16 May 2004: Akrotiri (Cyprus) — Amman (Jordan) : 420 km
  
  BULLET::::- 17–19 May 2004: Break — 3 days off.
  
  BULLET::::- 20 May 2004: Amman — Turaif (Saudi Arabia) — Ar'Ar : 580 km
  
  BULLET::::- 21 May 2004: Ar'Ar — Hafr-AL-Batin : 420 km
  
  BULLET::::- 22 May 2004: Hafr-AL-Batin — Al Quasumah — Jubail (Saudi Ar) — Bahrain: 593 km. Total distance since start : 5,835 km
  
  BULLET::::- 24 May 2004: Bahrain — Abu Dhabi (Arab Emirates) : 452 km
  
  BULLET::::- 26 May 2004: Abu Dhabi — Muscat (Oman): 410 km. Total distance since start: 6,697 km
   BULLET::::- Agriculture – crop dusting, game monitoring, hydroseeding, livestock mustering, pest control, wildlife management
  
  BULLET::::- Firefighting – helicopter bucket, helitack
  
  BULLET::::- Flight training
  
  BULLET::::- Forestry – heli-logging, stream restoration
  
  BULLET::::- Freight – aerial crane, airdrop; general cargo and mail delivery in remote areas
  
  BULLET::::- Industrial – construction, inspection and maintenance of overhead power lines, pipelines, mobile phone towers, offshore wind farms, hydropower facilities, and other infrastructure
  
  BULLET::::- Maritime – pilot transfer and other ship-to-shore transport
  
  BULLET::::- Medical – air ambulance, medical evacuation
  
  BULLET::::- Military – aeromedical evacuation, pilot training; airlift, vertical replenishment and other logistical support
   San Francisco and Oakland Helicopter Airlines
  
  San Francisco and Oakland Helicopter Airlines (also known as SFO Helicopter Airlines and SFO Helicopter) was a helicopter airline service offering scheduled passenger flights between San Francisco, Oakland, and other Bay Area cities. It was founded in 1961 but disappeared from the Official Airline Guide 15 years later before finally going out of business in 1986.
  
  Section::::History.
   BULLET::::- FM 1–111 Aviation Brigades from 27 October 1997 by Headquarters Department of the Army at GlobalSecurity.org
  
  BULLET::::- FM 1-112 Attack Helicopter Operations from 2 April 1997 by Headquarters Department of the Army at GlobalSecurity.org
  
  BULLET::::- FM 1-113 Utility and Cargo Helicopter Operations from 25 June 1997 by Headquarters Department of the Army at GlobalSecurity.org
  
  BULLET::::- FM 1-114 Air Cavalry Squadron and Troop Operations from 1 February 2000 by Headquarters Department of the Army at GlobalSecurity.org
  
  BULLET::::- FM 1-120 Army Air Traffic Service Contingency and Combat Zone Operations from 22 May 1995 by Headquarters Department of the Army at GlobalSecurity.org
   BULLET::::- Test pilot Robert G. Ferry landed a Hughes OH-6A Pawnee helicopter in Ormond Beach, Florida after flying 2,213.1 miles from Culver City, California without refueling, to set the record for the longest non-stop helicopter flight.
   Section::::Films.:"Kobarweng or Where is Your Helicopter?".
   Section::::Safety.
  
  Section::::Safety.:Maximum speed limit.
   Rotor-powered examples have demonstrated ground speeds that exceed that of the wind, both directly "into the wind" and directly "downwind" by transferring power through a drive train between the rotor and the wheels. The wind-powered speed record is by a vehicle with a sail on it, "Greenbird", with a recorded top speed of .
  
  Other wind-powered conveyances include sailing vessels that travel on water, and balloons and sailplanes that travel in the air, all of which are beyond the scope of this article.
  
  Section::::Sail-powered.
   BULLET::::- 25 August
  
  BULLET::::- A weeklong search in the Federated States of Mirconesia for a couple aboard a missing sailboat ends when a United States Navy helicopter investigating a report from the previous evening of a light seen on uninhabited Fayu Atoll discovers a large "SOS" drawn in the sand and spots the couple waving. The couple is rescued by boat on 26 August.
  
  BULLET::::- 26 August
   Section::::Home Timeline.
  
  The people of the Home Timeline, overall, believe themselves to be scientific rationalists, otherwise known as Rational Empiricists, and atheists. Their calendar numbers days of the year rather than months.
  
  The Home Timeline's capital city apparently is Dhergabar, as is the home of many of its prominent scientific and cultural institutions. Based on clues in the stories, Dhergabar seems to be located in the general vicinity of our timeline's India - Malaysia, some three hours travel by rocket from the east coast of North America over the North Pole.
   Section::::Explanation.
  
  Rotor-powered vehicles, like "Blackbird", have a drive linkage between the rotor and the wheels. Gaunaa, "et al." describe the physics of rotor-powered vehicles. They describe two cases, one from the vantage point of the earth and the other from the vantage point of the air stream and come to the same conclusions from both frames of reference. They conclude that (apart from forces that resist forward motion):
  
  BULLET::::- There is no theoretical upper limit to how fast a rotor-driven craft can go directly upwind.
  