2c/7 orthogonal

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2c/7 orthogonal
Spaceship Yes
Puffer Yes
Rake Yes
Wickstretcher No
Gun Yes

2c/7 orthogonal is a speed that is equivalent to two sevenths of the speed of light.


The first 2c/7 spaceship discovered was the weekender, which was found by David Eppstein on January 12, 2000 using his search program, gfind. On April 27, 2000, Stephen Silver discovered a tagalong that can be pulled by two weekenders.[1] Attaching these tagalongs to weekenders was the only known method of constructing other 2c/7 spaceships, besides building self-sustaining loops of weekender conduits (see Rakes).

Another 2c/7 spaceship, the scholar, was found by Andrew J. Wade on December 30, 2019.[2] Wade found a third elementary spaceship, 186P7H2V0, on March 22, 2020,[3] based on a 2c/7 wave found by Hartmut Holzwart on April 30, 2016.[4]

Holzwart also found a different 2c/7 wave on September 10, 2008,[5] but as of early 2020, a spaceship stabilization has not been found for it.


On December 26, 2013, Ivan Fomichev built a period-8974 2c/7 puffer by perturbing a lightweight spaceship with several weekenders.[6] The next day, he built a smaller period-6622 puffer after Hartmut Holzwart pointed out a simpler design Jason Summers used in his 2c/5 puffer.[7]


On May 22, 2014, Ivan Fomichev constructed a period-16982 2c/7 rake by synthesising a lightweight spaceship seed with weekender conduits.[8]


On September 26, 2015, Chris Cain constructed a weekender gun[9] based on a 79-glider synthesis.


x = 83, y = 52, rule = B3/S23 5bo8bo8bo8bo8bo8bo8bo8bo8bo$4b3o6b3o6b3o6b3o6b3o6b3o6b3o6b3o6b3o$4b3o 6b3o6b3o6b3o6b3o6b3o6b3o6b3o6b3o3$2b2o3b2o2b2o3b2o2b2o3b2o2b2o3b2o2b2o 3b2o2b2o3b2o2b2o3b2o2b2o3b2o2b2o3b2o$2b3ob3o2b3ob3o2b3ob3o2b3ob3o2b3ob 3o2b3ob3o2b3ob3o2b3ob3o2b3ob3o2$9b2o7b2o7b2o7b2o7b2o7b2o7b2o7b2o$4bobo 6bobo6bobo6bobo6bobo6bobo6bobo6bobo6bobo2$3bo3bo4bo3bo4bo3bo4bo3bo4bo 3bo4bo3bo4bo3bo4bo3bo4bo3bo$9b2o7b2o7b2o7b2o7b2o7b2o7b2o7b2o28$bo15bo 15bo15bo15bo15bo$3o4bo3bo4b3o4bo3bo4b3o4bo3bo4b3o4bo3bo4b3o4bo3bo4b3o$ 3o4b2ob2o4b3o4b2ob2o4b3o4b2ob2o4b3o4b2ob2o4b3o4b2ob2o4b3o$6bobobobo9bo bobobo9bobobobo9bobobobo9bobobobo$7bo3bo11bo3bo11bo3bo11bo3bo11bo3bo$ 5bo7bo7bo7bo7bo7bo7bo7bo7bo7bo$3b3o7b3o3b3o7b3o3b3o7b3o3b3o7b3o3b3o7b 3o$3bo2b2o3b2o2bo3bo2b2o3b2o2bo3bo2b2o3b2o2bo3bo2b2o3b2o2bo3bo2b2o3b2o 2bo$3b6ob6o3b6ob6o3b6ob6o3b6ob6o3b6ob6o$4bo9bo5bo9bo5bo9bo5bo9bo5bo9bo $6bobobobo9bobobobo9bobobobo9bobobobo9bobobobo$7b2ob2o11b2ob2o11b2ob2o 11b2ob2o11b2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ ZOOM 5 ]]
2c/7 waves found by Hartmut Holzwart
(click above to open LifeViewer)
RLE: here Plaintext: here

See also


  1. Jason Summers' jslife pattern collection.
  2. Andrew J. Wade (December 30, 2019). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  3. Andrew J. Wade (March 22, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  4. Hartmut Holzwart (April 30, 2016). Re: Incomplete search patterns - try to complete (discussion thread) at the ConwayLife.com forums
  5. Matthias Merzenich (April 18, 2018). "jslife-moving pattern collection". Retrieved on March 22, 2020.
  6. Ivan Fomichev (December 26, 2013). "Re: Weekender Reactions: Building a 2c/7 Puffer". Retrieved on December 27, 2013.
  7. Ivan Fomichev (December 27, 2013). Re: Weekender Reactions: Building a 2c/7 Puffer (discussion thread) at the ConwayLife.com forums
  8. Ivan Fomichev (May 22, 2014). "Re: Weekender Reactions: Building a 2c/7 Puffer". Retrieved on May 26, 2014.
  9. Chris Cain (September 26, 2015). "Re: Small Spaceship Syntheses". Retrieved on November 17, 2015.

External links