2c/7 orthogonal

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

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

Spaceships

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.

Puffers

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]

Rakes

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

Guns

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

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2c/7 waves found by Hartmut Holzwart
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RLE: here Plaintext: here
gollark: TV licenses aren't EXACTLY that, they're weirder.
gollark: The UK does free terrestrial TV, I don't think satellite is much of a thing here.
gollark: They were initially meant to be reducing the number of people going, in the UK.
gollark: But also do consider the future somewhat because not doing that would be bad.
gollark: Never mind, I checked the internet, now I have a rough idea.

See also
  • List of important speeds
  • List of spaceships with speed 2c/7
  • List of puffers with speed 2c/7

References
  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.
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