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A space elevator is a theoretical system using a super-strong ribbon going from the surface of the Earth to a point beyond Geosynchronous orbit. The center of gravity of the ribbon would be exactly in geosynchronous orbit, so that the ribbon would always stay above the anchor point. Vehicles would climb the ribbon powered by a beam of energy projected from the surface of the Earth. Building a space elevator requires materials and techniques that do not currently exist. A variety of Space Elevator competitions have been held in order to stimulate the development of such materials and techniques. Space elevators were first conceived in 1895, but until the discovery of carbon nanotubes, no technology was envisioned that could make them possible. Building an actual elevator is still out of reach, but the directions for research are clear. This makes the area ripe for incentive prizes like the X Prize, and prizes and competitions have been set up since 2005〔(【引用サイトリンク】url=http://www.isec.org/index.php/activities/space-elevator-competitions )〕 to encourage the development of relevant technologies. There are two main areas of research remaining, and these are where the competitions focus: building cables ("a Tether challenge"), and climbing and descending cables ("a Power Beam challenge"). In a Power Beam Challenge, each team designs and builds a climber (a machine capable of traveling up and down a tether ribbon). In a Tether challenge, each team attempts to build the longest and strongest cable. In the Power Beam challenge climber carry a payload. Power is beamed from a transmitter to a receiver on the climber. With each competition, the tethers reach higher altitudes, and the climbers are expected to climb further. Each competition can have minimum lengths and maximum weight per meter for cables, and minimum speed and distance goals for climbers. ==Space elevator challenge results== Like many competitions modeled after the X prize, competitors have to meet a minimum baseline, and then prizes are awarded to the best entry that exceed that target. In 2005, there was only a climbing challenge, and none of the entrants met the minimum speed requirement of 1 m/s. Starting in 2006, Elevator:2010, sponsored by spaceward.org〔(【引用サイトリンク】url=http://www.spaceward.org/games )〕 and NASA conducted a series of competitions. For 2006, the prize was increased, and the speed requirement dropped slightly to 50 meters in under a minute. 13 teams entered, and one was able to climb the 50 meters in 58 seconds. In 2009 at Edwards Air Force Base, the challenge was climbing a 900 m tether, and one entry managed the feat several times, with a top speed of 3.5 m/s. NASA didn't renew their sponsorship after 2009,〔(【引用サイトリンク】url=http://www.spaceelevatorblog.com/?p=1544 )〕〔(【引用サイトリンク】url=http://challenge.gov/NASA/27-strong-tether-challenge )〕 pending "further advancements in material science". The International Space Elevator Consortium was formed in 2008,〔(【引用サイトリンク】url=http://www.isec.org/images/PressReleases/ISECAnnouncementNR-final.pdf )〕 and has held annual conferences. They announced a $10,000 Strong Tether Challenge competition for 2013. The Challenge was canceled for lack of competitors.〔http://www.isec.org/sec/〕 The 2011, 2012, and 2013 ISEC conferences also featured FIRST-style High School robotics competitions for climbers.〔(【引用サイトリンク】url=http://www.isec.org/sec/ )〕〔(【引用サイトリンク】url=http://www.spaceelevatorblog.com/?p=1579 )〕 and occasional competitions. The Japan Space Elevator Association held a climbing competition in August 2013.〔(【引用サイトリンク】url=http://www.jsea.jp/technology/challenge/000405.html )〕 Hot air balloons were used to hoist a tether, and Team Okusawa's entry〔(【引用サイトリンク】title=Orbital elevator group )〕 succeeded in climbing to 1100 meters,〔(【引用サイトリンク】url=http://www.jsea.jp/technology/challenge/000412.html )〕 and a team from Nihon University reached 1200 meters. (The sources are in Japanese.) The Japan Space Elevator Association held a climbing competition in August 2014.〔(【引用サイトリンク】url=http://www.jsea.jp/technology/challenge/000439.html )〕 Hot air balloons were used to hoist both rope (11 mm) and ribbon (35 mm x 2 mm) to 200 m and 1200 m. Team Okusawa climbed to 1200 m and descended twice. Kanagawa University carried a 100 kg payload to 123 m on the 200 m ribbon. Kanagawa University's three teams climbed respectively to 1200 m (rope), 1150 m (rope) and 1100 m (ribbon). Munich University of Technology reached 1000 m (rope). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Space elevator competitions」の詳細全文を読む スポンサード リンク
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