31P8H4V0

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31P8H4V0
b5o$bo4bo$bo$2bo4bo$4bo$5b2o2bo$3bo2bo3bo$bo7bo$o5bo2bo$o3b2o$4o2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 16 TRACKLOOP 8 -1/2 0 THUMBSIZE 3 GPS 4 ]]
Pattern type Spaceship
Number of cells 31
Bounding box 11 × 11
Direction Orthogonal
Period 8 (mod: 8)
Speed c/2 | 4c/8
Heat 42.5
Kinetic symmetry n
Discovered by Jason Summers
Year of discovery 2002

31P8H4V0 is the smallest known period-8 c/2 orthogonal spaceship and a would-be block puffer made of a middleweight spaceship and another xWSS whose output is cancelled by its own spark. It was found by Jason Summers on October 29, 2002.[1]

Glider synthesis

A partial glider synthesis for this spaceship was posted by Goldtiger997 on April 9, 2020, with the final step and most of the base still life construction completed.[2] The synthesis was completed with 189 gliders the next day.[3] Several minor improvements, reducing the synthesis to 182 gliders, were posted by Mark Niemiec on June 6.[4] On August 3, BlinkerSpawn and Tanner Jacobi found a 37-glider synthesis using a different base.[5]

Backrake

31P8H4V0 continues operating if the block it produces is destroyed by other objects before itself, so acts as a moving factory.

On February 2, 2025, Caleb R. Hilton found a p16 backrake using this property, which is four cells thinner than the known one based on the Coe ship.[6]

x = 26, y = 15, rule = B3/S23 12b3o$11b5o$11b3ob2o$14b2o$18b2o2b4o$20b2o3bo$13bo2bo2bo5bo$13bo10bo$13bo5bo2bo$14bo4b2o$2b2o7bo9bo$o4bo3bo3bo4bo4bo$6bo7bo9bo$o5bo2bo4bo4bo4bo$b6o3b5o5b5o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 18 HEIGHT 420 X -2 TRACK 1/2 0 GPS 4 AUTOSTART ]]
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References

  1. Jason Summers' jslife pattern collection. Retrieved on March 17, 2020.
  2. Goldtiger997 (April 9, 2020). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  3. Goldtiger997 (April 10, 2020). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  4. Mark Niemiec (June 6, 2020). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  5. BlinkerSpawn (August 3, 2020). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  6. C_R_116 (February 2, 2025). Message in #cgol on the Conwaylife Lounge Discord server