c/5 diagonal

c/5 diagonal is a diagonal speed that is equivalent to one fifth of the speed of light.

c/5 diagonal
Spaceship Yes
Puffer Yes
Rake Yes
Wickstretcher Yes
Gun Yes

Spaceships

The first c/5 diagonal spaceship to be discovered was 295P5H1V1 and was found by Jason Summers on November 22, 2000.[1] No other spaceships of this speed were discovered until January 8, 2005, when Jason summers found the much smaller 86P5H1V1. In July 2006 Nicolay Beluchenko discovered three new c/5 diagonal spaceships, including the asymmetric 67P5H1V1.[2] The smallest known c/5 diagonal spaceship, 58P5H1V1, was discovered by Matthias Merzenich on September 5, 2010.[3]

After a gap of several years, on March 26-27, 2020, AforAmpere found new c/5 diagonal ships with a different shape from previous discoveries.[4]

The first glider synthesis for a c/5 diagonal spaceship (58P5H1V1) was found by Goldtiger997 and Tanner Jacobi in April 2020.[5][6] A gun based on this synthesis has yet to be constructed.

Puffers
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three-ship puffer by Peter Naszvadi
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the first c/5 diagonal puffer to be discovered
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The first c/5 diagonal puffer was built by Matthias Merzenich on September 5, 2010.[3] It consists of four copies of 58P5H1V1 continually hassling a glider, leaving debris behind at a period of 1450.

A period-1540 glide-symmetric three-ship puffer was discovered by Peter Naszvadi in March 2020, shown to the right.[7]

Rakes

The first clean c/5 diagonal rake was constructed by Matthias Merzenich on September 7, 2010.[3] The rake has a period of 1585 and works by circulating two gliders. Alternative rake designs were constructed by Merzenich and Adam P. Goucher. The lowest period so far achieved for a c/5 diagonal rake is 85.[8]

Wickstretchers

The first c/5 diagonal wickstretcher was found by Matthias Merzenich on January 26, 2011.[3] It consists of a tagalong pulled by two copies of 58P5H1V1 that stretches two tubs.

Guns

On May 22, 2020, Entity Valkyrie constructed a period-2760 58P5H1V1 gun.[9]

gollark: You should instead live out of spite.
gollark: osmarkscalculator™++™?
gollark: Maybe I should move it to one of the ultrahyperreliability™ osmarksclouds™.
gollark: Meanwhile, ABR is *not* dead.
gollark: https://i.osmarks.net/memes-or-something/apl.png

See also
  • c/5 orthogonal
  • List of important speeds
  • List of spaceships with speed c/5
  • List of puffers with speed c/5

References
  1. Jason Summers' jslife pattern collection.
  2. Heinrich Koenig (July 15, 2006). "New c/5 Diagonal Spaceships". Game of Life News.
  3. Adam P. Goucher (January 26, 2011). "New c/5 diagonal technology". Game of Life News.
  4. AforAmpere (March 26, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  5. Tanner Jacobi (April 2, 2020). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  6. Goldtiger997 (April 3, 2020). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  7. Peter Naszvadi (March 27, 2020). Re: Thread For Your Useless Discoveries (discussion thread) at the ConwayLife.com forums
  8. Matthias Merzenich (September 9, 2015). Re: Switchable gun? (discussion thread) at the ConwayLife.com forums
  9. Entity Valkyrie (May 22, 2020). Re: Construction practice (discussion thread) at the ConwayLife.com forums
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