Skyhook - Revision history

Neil: Fixed typos and clarified wording

2007-11-04T02:37:27Z

Fixed typos and clarified wording

Neil: Describes Earth skyhook and Lunar skyhook

2007-11-03T01:25:30Z

Describes Earth skyhook and Lunar skyhook

Neil: /* See Also */ These are more common names, but the stubs may not yet exist

2007-11-02T21:14:23Z

See Also: These are more common names, but the stubs may not yet exist

Strangelv: stub sorting

2007-06-10T17:41:32Z

stub sorting

Cfrjlr: /* See Also */ format

2007-06-10T15:46:02Z

Cfrjlr: /* See Also */ lunar elevator

2007-06-10T15:45:20Z

Cfrjlr: replace Transportation with Space Transport

2007-06-10T15:32:58Z

replace Transportation with Space Transport

Apsmith: Added categories

2007-06-09T04:10:13Z

Added categories

Mdelaney: New page: == External Links == * [http://www.treitel.org/Richard/rass/stalk05.html http://www.treitel.org/Richard/rass/stalk05.html] Would a beanstalk (or "skyhook") be possible on the moon...

2007-04-11T13:45:34Z

New page: == External Links == * [http://www.treitel.org/Richard/rass/stalk05.html http://www.treitel.org/Richard/rass/stalk05.html] Would a beanstalk (or "skyhook") be possible on the moon...

New page

== External Links ==

* [http://www.treitel.org/Richard/rass/stalk05.html http://www.treitel.org/Richard/rass/stalk05.html] Would a [[beanstalk]] (or "[[skyhook]]") be possible on the moon?
<br>
'''These links show you can have a [[tethered satellite]] at [[L-1]], tethered to lunar surface at [[Sinus Medii]]:'''
<br>
* [http://www.star-tech-inc.com/papers/als/lunar.pdf http://www.star-tech-inc.com/papers/als/lunar.pdf] - [[Anchored Lunar Satellites]] for [[Cislunar]] Transportation and Communication - Jerome Pearson

* [http://www.star-tech-inc.com/spaceelevator.html http://www.star-tech-inc.com/spaceelevator.html] - [[Space Elevators]] and other Advanced Concepts - Jerome Pearson

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 {{Eng Stub}}
-CNT has a theroretical strength of 1000 GPa and several other materials are almost as good. So far, the macro strength of actual ribbon has been much less, but hopes are still high for 60GPa working strength or more. Funding is needed to advance several other possible show stoppers.
+Is the Space Elevator Even Theoretically Possible? Yes and the lunar elevator = skyhook can likely be built with 2007 materials. There is lots of correct info at www.liftport.com There is also a forum which has some errors at www.liftport.com look for word forum about 80% of the way down the main page. Let's focus on the Edwards space elevator in this article and a separate article about a bolo = rotating tether and rotovator. Edwards proposed 91,000 kilometers = 60,000 miles of ribbon. 60% of the ribbon is above GEO altitude, and a modest counter-weight is still needed at the far end. This is because Earth's gravity decreases with altitude. Edwards starts with a ribbon that can only lift one ton with a breaking strength of two tons. The climber = lifter has pinch rollars powered by electric motors to climb the ribbon. The electricity is delivered by laser beams to two photovoltaic panels. Other methods of propelling the climber run out of fuel before reaching GEO altitude, even with no payload. The payload is a reel of very thin CNT thread, at least 60,000 miles long, which the climber attaches to the ribbon to increase the strength of the ribbon. Several hundred of these threads are needed to increase the ribbon strength to 20 tons = break at 40 tons. Climbers that have layed thread are stored at the far end to serve as the counter-weight. If the CNT has a working strength of 60 GPa, the cross sectional area at GEO altitude needs to be about double the cross sectional area at the top and bottom end = the ribbon is tapered. The required taper ratio increases rapidly with slightly weaker material, quickly making the ribbon too costly, and the number of strengthening threads required increases rapidly until the construction time exceeds the 10 or 20 years before the ribbon is excesssively lumpy from patches due to space junk damage. It is thought that the ribbon can dodge the pieces of space junk which are large enough to have known orbits, by moving the anchor ship a few kilometers per day. One gram and smaller pieces will make small holes in the ribbon, some of which will need to be patched before the ribbon can operate at full capacity.
-The space elevator has some dangers, some of which are avoided with a lunar skyhookook.
+CNT has a theroretical strength of 1000 GPa and several other materials are almost as good. So far, the macro strength of actual ribbon has been much less, but hopes are still high for 60GPa working strength or more. Funding is needed to advance several other possible show stoppers.
-The ribbon is black so night flying birds will likely be killed if they hit the sharp edge of the ribbon, but the anchor ship will be far from land so birds will be rare.
+The space elevator has some dangers, some of which are avoided with a lunar skyhook.
 The airspace can be restricted to craft on official business.
-The lunar space elevator will extend from a winch near the center if the side of the Moon visable from Earth though the Earth-Moon L1 plus perhaps 50,000 more kilometers. Climbers powered by lasers will drop their cargo at or near the end and it will fall rapidly toward Earth where it will do a sling shot manuver = gravity assist manuver to other locations in the solar system. Some delta v is needed for this manuver or to do areobreaking in Earth's atmosphere for a soft landing on Earth.
+People who work with CNT will be trained to be careful not to eat nor inhale the fibers. It appears that the hazard is similar to rockwool and fiberglass, but much less than asbestos.
-The reverse direction will take almost as much fuel as landing on the moon directly, so pay loads will rarely use the skyhook for deliveries to the moon, but deliveries to L1 from the moon may be best done with the Skyhook.
 See also:
-[[Space elevator]]
+*[[Space elevator]]
 *[[bolo]]

@@ Line 1: / Line 1: @@
 {{Eng Stub}}
-{{Subminimal}}
+Is the Space Elevator Even Theoretically Possible? Yes and the lunar elevator = skyhook can likely be built with 2007 materials
-== See Also ==
+There is lots of correct info at www.liftport.com There is also a forum which has some errors at www.liftport.com look for word forum about 80% of the way down the main page.
-*[[Tether]]
+Let's focus on the Edwards space elevator in this article and a separate article about a bolo = rotating tether and rotovator.
-*[[Lunar Elevator]]
+Edwards proposed 91,000 kilometers = 60,000 miles of ribbon. 60% of the ribbon is above GEO altitude, and a sizeable counter-weight is still needed at the far end. This is because Earth's gravity decreases with altitude. Edwards starts with a ribbon that can only lift one ton with a breaking strength of two tons. The climber = lifter has pinch rollars powered by electric motors to climb the ribbon. The electricity is delivered by laser beams to two photovoltaic panels. Other methods of propelling the climber allow no payload. The payload is a reel of very thin CNT thread, 60,000 miles long, which the climber attaches to the ribbon to increase the strength of the ribbon. Several hundred of these threads are needed to increase the ribbon strength to 20 tons = break at 40 tons. Climbers that layed thread are stored at the far end to serve as the counter-weight.
-*[[Space elevator]]
+If the CNT has a working strength of 60 GPa, the cross sectional area at GEO altitude needs to be about double the cross sectional area at the top and bottom end = the ribbon is tapered. The required taper ratio increases rapidly with slightly weaker material, quickly making the ribbon too costly, and the number of strengthening threads required increases rapidly until the construction time exceeds the 10 or 20 years before the ribbon is excesssively lumpy from patches due to space junk damage. It is thought that the ribbon can dodge the pieces of space junk which are large enough to have known orbits, by moving the anchor ship a few kilometers per day. One gram and smaller pieces will make small holes in the ribbon, some of which will need to be patched before the ribbon can operate at full capacity.
 *[[bolo]]

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 *[[Tether]]
 *[[Lunar Elevator]]
 == External Links ==

@@ Line 1: / Line 1: @@
-{{Stub}}
+{{Eng Stub}}
+{{Subminimal}}
 == See Also ==
 *[[Tether]]

@@ Line 2: / Line 2: @@
 == See Also ==
-[[Tether]]
+*[[Tether]]
-[[Lunar Elevator]]
+*[[Lunar Elevator]]
 == External Links ==

← Older revision		Revision as of 15:32, 10 June 2007
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	* [http://www.star-tech-inc.com/spaceelevator.html http://www.star-tech-inc.com/spaceelevator.html] - [[Space Elevators]] and other Advanced Concepts - Jerome Pearson		* [http://www.star-tech-inc.com/spaceelevator.html http://www.star-tech-inc.com/spaceelevator.html] - [[Space Elevators]] and other Advanced Concepts - Jerome Pearson

−	[[Category: ~~Transportation~~]]	+	[[Category:Space Transport]]

← Older revision		Revision as of 04:10, 9 June 2007
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		+	{{Stub}}
		+
		+	== See Also ==
		+	[[Tether]]
		+
	== External Links ==		== External Links ==

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	* [http://www.star-tech-inc.com/spaceelevator.html http://www.star-tech-inc.com/spaceelevator.html] - [[Space Elevators]] and other Advanced Concepts - Jerome Pearson		* [http://www.star-tech-inc.com/spaceelevator.html http://www.star-tech-inc.com/spaceelevator.html] - [[Space Elevators]] and other Advanced Concepts - Jerome Pearson
		+
		+	[[Category: Transportation]]