Cordership

A Cordership is any spaceship that is based on switch engines. They necessarily have speed c/12 diagonal and period that is a multiple of 96. Corderships were the slowest known spaceships before discovery of Gemini in 2010, although arbitrarily slow spaceships had been known to exist (see universal constructor). They are named after Charles Corderman, who discovered the switch engine in 1971.

The first Cordership, which used 13 switch engines, was found by Dean Hickerson in April 1991. He soon thereafter found a smaller 10-engine Cordership, and in August 1993 a 7-engine Cordership. In July 1998 he found the first 6-engine Cordership. Many Corderships are now known that use eight, five, four, three, or two switch engines. The Switchwave allows extensible Corderships; an example 20-engine Cordership can be found in the respective article.

54b3o40b$53bo2bo40b$52bo4bo39b$52bo2b3o39b$52bo5bo38b$53b7o37b$59bo37b $59bo37b$57b2o12b2o24b$71b2o24b7$79b2o16b$79b2o16b$36b3o58b$35bo3bo57b $34bo4bo57b$34bo2bobo35bo21b$34b2obobo34bo22b$36b2obo2bo32bo21b$38b2o 2bo44b2o8b$39b3o45b2o8b$28b3o38bo27b$27bo2bo36bobo27b$26bo4bo34b2o29b$ 26bo2b3o65b$26bo5bo14b3o7bobo37b$27b7o16b3o5bo38b$33bo16b3o42b2o$33bo 17bo34bo8b2o$31b2o53bo10b$86bo10b$87b2o8b$87b3o7b$39bo47b2o8b$39bo57b$ 39bo57b$40b2o55b$40b3o54b$40b2o44bo10b$10b3o74bo9b$9bo3bo72bo10b$8bo4b o52b2o29b$8bo2bobo52b2o29b$8b2obobo25bo27bo29b$10b2obo2bo21bobo56b$12b 2o2bo21bo2bo55b$13b3o81b$2b3o62b3o7bobo17b$bo2bo32bo2bo29b3o5bo18b$o4b o31b2ob3o27b3o24b$o2b3o33b2o2bo27bo25b$o5bo27b2o4bo2bo53b$b7o22b2o3bo 4bobo12b2o40b$7bo11b3o7bo6bo18b3o39b$7bo14b3o5bo3b5o21bo36b$5b2o15b3o 6bo3bo24bo36b$23bo11bo2bo21bo36b$36b2o23b2o34b$61b3o33b$4bo56b2o34b$3b obo91b$2b2obo91b$2b2o93b$3b3o91b$4bo55bo36b$5bo2bo52bo35b$2bo6bo50bo 36b$2bo6bo87b$2bo4b3o87b5$41b3o7bobo43b$44b3o5bo44b$7b2o35b3o50b$7b2o 36bo51b4$34bo62b$34bo62b$34bo62b$15b2o18b2o60b$15b2o18b3o59b$35b2o60b 5$34bo62b$23b2o10bo61b$23b2o9bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] [[ HEIGHT 720 WIDTH 720 THUMBSIZE 2 ZOOM 6 GPS 12 AUTOSTART TRACKLOOP 96 -1/12 -1/12 ]]

First Cordership (click above to open LifeViewer) RLE: here Plaintext: here

Sparse Cordership

in 2017, David Bell discovered a Cordership made from individual switch engines that do not directly react with each other. All previously-known Corderships required interactions between two or more adjacent switch engines. This design, on the other hand, allows the individual switch engines to be separated by arbitrary distances, relying instead on long-range interactions mediated by gliders and stable objects. Similar Corderships can be constructed having an arbitrarily large separation between any of the switch engines.

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12bo7b2o$382b4o20b2o$382b3o15bo$371b2o24bo$371b2o24bo2bo$396b3o$396b3o $396bo2bo$365b3o29bobo$365bo31b3o$366bo$379b2o$379b2o5b2o$386b2o6$387b 2o$387b2o5b2o$394b2o3$230bobo148b3o$230b2o149bo$231bo150bo$395b2o6bo$ 395b2o5bobo$402bobo$403bo2$398b2o$397bo2bo$398b2o6$397b3o$397bo$398bo 14$214bobo152b2o$214b2o154b2o$215bo153bo14$337b2o$338b2o$337bo14$198b obo104b2o$198b2o106b2o$199bo105bo14$273b2o$274b2o$273bo14$182bobo56b2o $182b2o58b2o$183bo57bo14$209b2o$210b2o$209bo8$148bo$140b3o3b4o$140bob o3b2ob2o$140b3o2bo$145b2o3bo$146b4o$147b3o10b2o4bobo8b2o$160b2o4b2o10b 2o$167bo9bo7$155bo$144b2o9b3o$143bobobo7b3o$143bo3b2o5bo3bo$144b2o8b4o $144b3o7bob2o6$148b2o$148b2o7$156b2o$156b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] [[ HEIGHT 1200 WIDTH 1000 THUMBSIZE 2 ZOOM 1.5 GPS 12 AUTOSTART TRACKLOOP 96 -1/12 -1/12 ]]

Cordership made from individual switch engines (click above to open LifeViewer) RLE: here Plaintext: here

Gallery

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  2-engine Cordership

• 

  3-engine Cordership

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  4-engine Cordership

• 

  4-in-a-row Cordership

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  5-engine Cordership

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  6-engine Cordership

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  6-in-a-row Cordership

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  7-engine Cordership

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  7-in-a-row Cordership

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  8-engine Cordership

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  10-engine Cordership

• 

  13-engine Cordership

See also

• Corderships (category)
• Infinite glider hotel
• Types of spaceships

External links

• Cordership at the Life Lexicon
• Cordership Discussion Thread (discussion thread) at the ConwayLife.com forums
• "jslife-moving/velocity-c12d". (Matthias Merzenich's update to the Cordership section of Jason Summers' "jslife-moving" collection)
• "New Compact Corderships". Game of Life News.