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.

<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>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 ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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2c/7 waves found by Hartmut Holzwart
(click above to open LifeViewer)
RLE: here Plaintext: here
gollark: Ah, yes, RSA-3072 and whatever are 3072 *bits*.
gollark: * which fits into 1KiB and for which internal state for bruteforcing fits into the remaining space.
gollark: How would you take over the world with it? You can bruteforce anything which fits into 1KB (are we assuming 1KiB here, not 1000 bytes exactly?), which is not that much.
gollark: "None are safe" is correct as an approximation, not *strictly*.
gollark: Unlikely. osmarks.tk™ is protected by highly advanced HTech™ Personality Constructs™.

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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