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Topic: Skyhook structure

Related Topics

Tether propulsion

Space elevator

Culture Orbital

Dyson sphere

Megastructure

Ringworld

Coriolis force

Jack and the Beanstalk

Equator

2004

	[No title]
		Half a skyhook is better than none For a given material, the required mass of a spinning cable is exponential in the square of the desired velocity of the cable tips.
		The skyhook structure, whichever variety, incorporates a power plant and a propulsion system to boost the upper end of the growing skyhook into the correct orbit, and to replace orbital momentum transferred to the shuttle payloads on each docking.
		The skyhook can be looked upon as an energy and momentum storage system by which an ion engine operating for long periods can accumulate its effect for the short, high intensity, spurts needed in an earth launch.
	www.frc.ri.cmu.edu /~hpm/project.archive/1976.skyhook/1982.articles/carley.mss (1397 words)

	Skyhook (disambiguation) - Wikipedia, the free encyclopedia
		The skyhook is attached to the air and the object.
		A hypothetical structure used for transporting material to and from a planet's surface into orbit.
		An unmanned balloon named Skyhook was launched by the United States Navy in 1957 to take pictures of the sun, and used in a number of other projects.
	en.wikipedia.org /wiki/Skyhook (253 words)

	[No title]
		We will consider a simple structure: a long cable whose center of mass is in a circular orbit in the plane of a planet's equator, and which rotates in the same plane.
		Taper ratio, in the upper left of each box, is the cross sectional area of the cable at its thickest (at the hub) divided by the area at the cable ends, where it is thinnest.
		Surface Accelerations Liftoff accelerations of payloads attached to rotating skyhooks at the moment of touchdown are the sum of the accelerations due to orbital motion and satellite rotation.
	www.frc.ri.cmu.edu /~hpm/project.archive/1976.skyhook/papers/scable.pox (5031 words)

	Skyhook (concept) - Encyclopedia, History, Geography and Biography (Site not responding. Last check: 2007-11-04)
		The term skyhook is used by Daniel Dennett in the book Darwin's Dangerous Idea to describe a source of design complexity that did not build on lower, simpler layers - in simple terms, a miracle.
		In philosophical arguments concerning the reducibility (or otherwise) of the human mind, Dennett's concept pokes fun at the idea of intelligent design emanating from on high, either subtaining from God, or providing its own grounds in an absurd, Munchausen-like bootstrapping manner.
		Dennett contrasts theories of complexity which require such miracles with those based on "cranes", structures which permit the contruction of entities of greater complexity but which are themselves founded solidly "on the ground" of physical science.
	www.arikah.net /encyclopedia/Skyhook_%28concept%29 (197 words)

	Flat Creek, Wyoming Restoration Project - methods
		During 1987, additional skyhook bank overhangs and a rock funnel were added to 650 ft of stream downstream of previous restoration structures.
		The skyhook bank cover panel is a modification of a bank cover/current deflector structure pioneered in Wisconsin.
		The primary purpose of the structure is to increase greatly the amount of pool area and hiding cover for adult trout.
	water.montana.edu /wildfish/Cases/methods/FlatCreek_WY.asp?ProjectID=33 (758 words)

	Skyhook (structure) - Encyclopedia, History, Geography and Biography (Site not responding. Last check: 2007-11-04)
		The largest and perhaps simplest of these is the space elevator, a cable that runs all the way from the planet's surface to beyond geosynchronous orbit.
		Smaller skyhooks include hypersonic skyhooks, rotating cables in lower orbits whose ends dip repeatedly down close to the planet's surface to snag payloads and lift them up.
		Large rotating tethers can also be used far from a planet's surface to transfer momentum to and from payloads, changing their orbits without the expenditure of reaction mass.
	www.arikah.net /encyclopedia/Skyhook_elevator (164 words)

	Product information display tag - Patent 4694595
		The hook structures referred to in the patent generally comprise individual hooks formed from metal rod and each of which has a support bracket formation at its proximal end whereby the hook is attached to a perforated board individually.
		4 is an enlarged elevational view of a mounting bracket for the skyhook structure with a perforated board on which it is mounted being shown in section.
		The skyhook has a vertical limb 16 with a cranked lower end 18, and horizontal limb 20 forming a display hook on which the products may be suspended in a row.
	www.freepatentsonline.com /4694595.html (1607 words)

	Skyhook: Definition and Links by Encyclopedian.com - All about Skyhook
		The largest and perhaps simplest of these is the space elevator, a cable that runs all the way from the planet's surface to beyond synchronous orbit.
		The term skyhook was also used by Daniel Dennett in the book Darwin's Dangerous Idea to describe a source of design complexity that did not build on lower, simpler layers -- loosely, a miracle.
		Dennett contrasts theories of complexity which require such miracles with those based on "cranes" -- structures which permit greater complexity but are founded solidly "on the ground" of that which has gone before.
	www.encyclopedian.com /sk/Skyhook.html (206 words)

	Josh Hall's "Space Pier" (Site not responding. Last check: 2007-11-04)
		The reason is simple: the structure would require at least ten thousand, and more likely 100 thousand, tonnes of near-atomically-perfect buckytubes or other graphite cable in a tapered form on the order of 80 thousand kilometers long.
		The theory behind the skyhook makes clear a number of other difficulties besides merely fabricating its material: It is essentially a satellite placed in geosynchronous (GEO) orbit, long enough on one end to reach the ground, and on the other to balance the ground arm and keep the center of mass in GEO.
		And the stationary skyhook is among the more sedate of the blue-sky earth-to-orbit schemes, with a respectable intellectual history and numerous references and analyses in the literature.
	discuss.foresight.org /~josh/tower/tower.html (555 words)

	Nanotechnology and Space
		The classic example is the synchronous skyhook [7], a cable in geosynchronous orbit reaching down to be anchored at the planet's surface, and extending upward so the entire structure is in tension.
		The ratio of the area of a skyhook at distance r from the planet to the area of the skyhook tip at the surface of the planet is expressed in equation (5) from [8]:
		One measure of skyhook feasibility is the taper ratio, the ratio between the widest point in the skyhook and the tips.
	www.zyvex.com /nanotech/nano4/mckendreePaper.html (3406 words)

	Safety system to prevent falls - Patent 6805220 (Site not responding. Last check: 2007-11-04)
		The system acts either to restrain a worker from moving too close to the edge of the structure or, if the restraining line is sufficiently long, the system acts to arrest a fall if a worker should slip over the edge.
		A system as claimed in claim 16 in which the shoulder is defined by an annular member in the hook having an opening through which the flexible line passes and the enlarged end is defined by a ferrule mounted to the end of the flexible line.
		The system of the present invention acts to restrain a worker from moving too close to the edge surface of an elevated structure, or, if the restraining line is positioned inadvertently close to the end of the elevated structure, the system acts to arrest a fall when a worker topples over the edge.
	www.freepatentsonline.com /6805220.html (4577 words)

	Art Fresh : Article 'Skyhook (concept)' (Site not responding. Last check: 2007-11-04)
		He is known for being one of the pioneers of the idea of space elevator (type of skyhook).
		By using a counterweight, a cable would be lowered from geosynchronous orbit to the surface of Earth while the counterweight was extended from the satellite away from Earth, keeping the center of mass of the cable motionless relative to Earth.
		Note that the ideas of the tower and the elevator differ since the tower is a compression structure, while the elevator is an orbiting tension structure, much easier to build and maintain.
	www.art-fresh.net /DisplayArticle525552.html (339 words)

	Long Space Transportation Tethers
		The Mooncable concept is a very long (about 180,000 miles long!) tensile structure balanced across the L-1 libration point between the Earth and the Moon, and attached to the lunar surface at one end.
		The structure is made of fiberglass, which has a strength of 500,000 lbf due to being made and used in a hard vacuum...there is no air to force its way into the surface microcracks that are the primary breaking mechanism on Earth.
		Conductors along the length of the structure couple energy generated by payload braking down the Earthside of the cable, over to the Lunarside of the cable to lift more payload up to L-1, in a process analogous to a siphon.
	home.earthlink.net /~jedcline/mcbl.html (1210 words)

	Tethers (Dani Eder; Jordin Kare; Hans Moravec)
		There is a compromise design which builds up from the ground using compressive structures and down from GEO using tensile structures, having their tips connected but not transmitting large forces across the connection.
		This is where you hang a rotating structure at the end of a hanging skyhook.
		The minimum mass total structure is found when the tower up from the ground and the cable down from GEO have the same area ratio from base (ground or GEO) to tip (where they meet).
	yarchive.net /space/exotic/tethers.html (4464 words)

	[No title]
		Skyhook Battle Your flight to the Skyhook will be hampered initially by an attacking fleet of TIE Fighters and TIE Bombers.
		Once at the Skyhook, your first objective is to knock out its defensive turrets, one on the end of each of its four arms.
		When all the turrets are destroyed, enter the Skyhook structure at the end of one its four arms.
	www.gamesover.com /walkthroughs/shadowem.txt (3246 words)

	[wordup] the space elevator
		Take one 36,000-km-long cable going down to earth and one 110,000-km-long cable going out to a ballast weight and you would have in effect a skyhook a cable strong enough to hold its own weight with the ballast weight helping to keep the center of mass of the system at a geostationary altitude orbit.
		Now, if the Skyhook used a number of cables arranged in a hollow structure, then electrified tracks could be built inside the structure and you would have a hoistway.
		A second version of the Skyhook is a Rotavator, which uses a cable that is much shorter than the geostationary orbit.
	lists.spack.org /pipermail/wordup/2001/000039.html (1836 words)

	eLibrary Project : Persistent data structure (Site not responding. Last check: 2007-11-04)
		In computing, a "persistent data structure" is a data structure which always preserves the previous version of itself when it is modified; such data structures are effectively immutable, as their operations do not (visibly) update the structure in-place, but instead always yield a new updated structure.
		A better method is to exploit the similarity between the new and old versions to share structure between them, such as using the same subtree in a number of tree structures.
		Among the most primitive type of persistent data structure is the linked list,singly-linked list or ''cons''-based list, a simple list of objects formed by each carrying a reference to the next in the list.
	elibraryproject.com /info/Persistent/data_structure.html (394 words)

	Skyhook (structure) (Site not responding. Last check: 2007-11-04)
		A skyhook is a hypothetical structure used for transporting material to and from a planet 's surface into orbit.
		The largest and perhaps simplest of these is the spaceelevator, a cable that runs all the way from the planet's surface to beyond geosynchronous orbit.
		Smaller skyhooks include hypersonic skyhooks, rotating cables in lower orbits whose endsdip repeatedly down close to the planet's surface to snag payloads and lift them up.
	www.therfcc.org /skyhook-structure--154727.html (132 words)

	Skyhook (structure) -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-04)
		The largest and perhaps simplest of these is the (additional info and facts about space elevator) space elevator, a cable that runs all the way from the planet's surface to beyond geosynchronous orbit.
		Smaller skyhooks include (additional info and facts about hypersonic skyhook) hypersonic skyhooks, rotating cables in lower orbits whose ends dip repeatedly down close to the planet's surface to snag payloads and lift them up.
		See (additional info and facts about tether propulsion) tether propulsion for more details on various types of skyhooks.
	www.absoluteastronomy.com /encyclopedia/S/Sk/Skyhook_(structure).htm (143 words)

	Skyhok - Vp1 BCW Irinland Stelth Skyhok (Irinland Duc Dufer - Irinland Evropa Enga) RUS, Moscow.
		The Cold War's Classified Skyhook Program A Skyhook balloon provides constant-level performance at a predetermined altitude The latter capability was once highly classified.
		Skyhook, Inc. Specializes in the construction of wireless communications sites in the Mid-Atlantic region of the United States.
		Skyhook, Inc. Started business in 1977 and has done work in all aspects of the Tower Industry work in the Mid-Atlantic States.
	www.destarter.com /skyhook/skyhok.html (341 words)

	No-jerk semi-active skyhook control method and apparatus - Patent 6115658
		The output of the logical test block 14' is a gating signal 16' which is multiplied by the scaled absolute velocity signal 15' in a multiplier block 12b' to determine the appropriate desired damper force Fdesired'.
		In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures.
		Therefore, it is to be understood that the foregoing is illustrative of the present invention and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims.
	www.freepatentsonline.com /6115658.html (4701 words)

	CommCorePlus / OceanView (Site not responding. Last check: 2007-11-04)
		A Skyhook gives the Incorporate City States a chance to consolidate their hold on the planet by reducing the cost of bringing both material and personnel to Poseidon.
		But what people do not know is that if the Skyhook had been cut any lower, the atmospheric section would have burned through the sky as the structure spun into space.
		The damage would have been incalculable; where the Skyhook hit land it would loft vast quantities of dust into the atmosphere and trigger earthquakes; where it hit the sea it would spawn countless mega tsunami - you could say goodbye to any city within 20 kilometres of the sea.
	www.visi.com /~seahawk/BP/commcore/issue2/editorial.html (946 words)

	Skyhook
		Specialty definitions using "skyhook": constant-level balloon ♦ skyhook balloon.
		"Skyhook" is generally used as a noun (singular) -- approximately 87.50% of the time.
		"Skyhook" is used about 8 times out of a sample of 100 million words spoken or written in English.
	www.websters-online-dictionary.org /sk/skyhook.html (613 words)

	g892.html
		The picture of two objects in space connected by a long thin structure, is a common element among the subject concepts.
		The fundamental characteristics of each of these structures involve associated concepts, such as the Mooncable's zero-gee casting at L-1 of foamed material into atmospheric re-entry shapes; and the enormous ring of space habitats in GEO being accessed directly from the Earth surface by the KESTS structure concepts.
		The Mooncable concept is a long tensile structure balanced across the L-1 libration point between the Earth and the Moon, and attached to the lunar surface at one end.
	www.kestsgeo.com /pages/geniefiles/g892.html (1977 words)

	Stream Improvement
		Due to habitat degradation, structures have become important to protect, restore, and improve trout carrying capacity of the stream.
		Structures are used to create more habitat, may help insect populations, cool and oxygenate the water, and may create spawning habitat.
		Structures can improve streams to the point where streams can produce fisheries that aren't supplemented by hatchery fish.
	www.wisflyfishing.com /friends/HTM/improve.htm (500 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		The bulk of the physical structure to be built in the Clarke Belt around the Earth would need to be built out of space resources.
		Housing of the colonists is on terraced condominiums along the sides slopes inside the rotating wheel habitat, including 45 square yards per person for residential and community life, 5 square yards per person for mechanical and life support systems, and 21 square yards per person for agriculture and food processing.
		Robotic construction builds the repetitive toroidal shell structures, then would be spun up to earth normal interior gravity, pressurized from Earth atmosphere components, then the interior outfitted in the way things are built on earth surface by people and machines.
	home.earthlink.net /~jedcline/progs.html (1120 words)

	Advanced Space Propulsion Study - OTHER PROPULSION CONCEPTS
		It would be a Skyhook, a magic beanstalk in reverse.Given adequate supplies stashed along the way, a lightweightspacesuit, and enough time, Jack would be able to climb intospace instead of having to use a rocket.
		The final versions ofa Skyhook system have two cables, one 36,000 km long going downto the surface of the Earth, and another 110,000 km long goingoutward to a ballast weight in order to keep the center of massof the system at geostationary altitude.
		It consists of ahexagonal structural mesh of wires held in tension by rotation.Each triangular section of a meter or so on a side would hold anunbacked ultrathin film of aluminum.
	www.transorbital.net /Library/D001_S03.html (3591 words)

	[No title]
		Challenge Point 7: This challenge point (along with an extra life icon, a 20 health pack, and a seeker ammo pack) is on the floor of the giant cog structure on your left after the generator room.
		Challenge Point 8: This challenge point (along with an extra life icon and a 20 health pack) is on the floor of the giant cog structure on your right after the generator room.
		The challenge point is on top of the rock structure that you will come to.
	www.cheatplanet.com /n64cheats/strategy/star_wars_shadow_of_the_empire.htm (6568 words)

	IMM Reports No. 16
		The theory behind the skyhook makes clear a number of other difficulties besides merely making its material: It is essentially a satellite placed in geosynchronous earth orbit (GEO), long enough on one end to reach the ground, and on the other to balance the ground arm and keep the center of mass in GEO.
		Compared to the skyhook, which is just barely possible with even the theoretical best material properties, a tower 100 km high is easy.
		The overall structure could be openwork like a radio tower, and could have approximately 60 footprints 10 km (30 long x 2 wide) apart on the ground — if we set aside a hectare for each foot, they only occupy 0.02% of the land under the tower.
	www.imm.org /Reports/Rep016.html (1342 words)

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