Coe ship

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Coe ship
14b2o$o7bob4ob2o$o7bo2b5o$8bo3b3o$2bo$2bo$12b4o$11bo3bo$15bo$11bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 16 TRACKLOOP 64 1/2 0 THUMBSIZE 2 GPS 4 HEIGHT 400 WIDTH 600 ]]
Pattern type Puffer engine
Number of cells 28
Bounding box 17×12
Frequency class 43.4
Direction Orthogonal
Period 16
Mod 16
Speed c/2
Speed (unsimplified) 8c/16
Heat 38.0
Discovered by Tim Coe
Year of discovery 1995

The Coe ship is the first known period-16 c/2 orthogonal spaceship, discovered by Tim Coe on October 26, 1995.[1] It consists of a lightweight spaceship stabilizing a sparky, modified heavyweight spaceship.

The Coe ship appeared in an asymmetric soup found by apgsearch in December 2015,[2] making it the first naturally occurring non-period-4 spaceship. A second Coe ship appeared on Catagolue in June 2016, and four more shortly after. Currently it is the 35th most common naturally occurring spaceship, being more common than HWSS on HWSS 8, but less common than MWSS on HWSS 13.[3]

Mark Niemiec found a 9-glider synthesis of this spaceship on October 28, 1995.[1] A 7-glider synthesis was discovered by 2718281828 on December 8, 2017.[4]

The Coe ship can be used as a puffer engine because it produces a long back spark, which leads to puffers and rakes, as shown below.[5]


Coe ship powering a backward rake
Coe ship powering a forward rake
Coe ship powering a block puffer

See also


  1. 1.0 1.1 Paul Callahan (November 13, 1995). "Tim Coe's p16 puffer engine". Paul Callahan's Page of Conway's Life Miscellany. Retrieved on November 9, 2020.
  2. Apple Bottom (December 27, 2015). Re: Soup search results (discussion thread) at the forums
  3. Adam P. Goucher. "Statistics". Catagolue. Retrieved on July 4, 2019.
  4. 2718281828 (December 8, 2017). Re: Small Spaceship Syntheses (discussion thread) at the forums
  5. Jason Summers' pattern collections. Retrieved on March 24, 2016.

External links

  • 28P16H8V0.1 at Heinrich Koenig's Game of Life Object Catalogs