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{{Spaceship|name=Schick engine|discoverer=Paul Schick|discoveryear=1972|pname=schickengine|bx=20|by=11|h=43.2|dir=Orthogonal|p=12|s=c/2|c=39|life105=true|life106=true|plaintext=true|rle=true|animated=true|synthesis=10|synthesisRLE=true}}
{{Spaceship
'''Schick engine''' (or '''Schick ship''') is an orthogonal [[c/2 orthogonal|c/2]] [[spaceship]] that was found by [[:Category:Patterns found by Paul Schick|Paul Schick]] in [[:Category:Patterns found in 1972|1972]]. Alternatively, it may refer just to the [[tagalong]] (displayed in green) that is attached to the back of the two [[lightweight spaceship]]s. The tagalong may also be attached to the back of two [[middleweight spaceship]]s, two [[heavyweight spaceship]]s, or a lightweight spaceship and a heavyweight spaceship.
|name             = Schick engine
|pname            = lightweightschickengine
|type            = Tagalong
|c                = 39
|bx               = 20
|by               = 11
|fc              = 48
|dir             = Orthogonal
|p               = 12
|m                = 12
|s               = c/2
|z                = 6c/12
|h                = 43.2
|symmetry        = -c
|discoverer      = Paul Schick
|discoveryear    = 1972
|rulemin          = B3/S23
|rulemax          = B3/S23
|rulespecial      = [[Conway's Game of Life|Conway Life]]
|isorulemin      = B3-cq/S23-c
|isorulemax      = B34ekqyz5jknqr6-ci/S234cejkty5aekr6ae7c
|synthesis        = 9
|synthesisRLE    = true
|plaintext       = true
|rle             = true
|animated         = true
|viewerconfig    = #C [[ TRACKLOOP 12 -1/2 0 THUMBSIZE 2 GPS 4 ]]
|apgcode          = xq12_fh1i0i1hfzw8sms8zxfjf
|pentadecathlonid = 39P12H6V0.1
|eppsteinid      = 13374
}}
The '''Schick engine''' (or '''Schick ship''') can refer to one of four {{periodS|12}} [[c/2 orthogonal]] [[spaceship]]s which involve a [[Standard spaceship flotilla#Two standard spaceships|flotilla of two standard spaceships]] pulling a period-12 [[tagalong]] consisting of a [[bullet heptomino]] and [[sparks]]. The term "Schick engine" may alternatively be used to refer to the tagalong alone, separately from the two spaceships supporting it.


Its eleven-cell rear [[spark]] can be perturbed by other c/2 spaceships to form a variety of [[puffer]]s and thus it is a [[puffer engine]].
This tagalong was found by [[Paul Schick]] in {{year|1972}}. For about fifty years the 39-cell LWSS-on-LWSS variant of the Schick engine was the smallest known period-12 spaceship in terms of population, until it was displaced by the 35-cell [[35P12H6V0]] in February {{year|2022}}.


==See also==
The four possible spaceship types are displayed [[#Table|in a table below]], with the tagalong portion highlighted in green.
*[[Blinker ship 1]]
 
Its eleven-cell rear [[spark]] can be perturbed by other c/2 spaceships to form a variety of [[puffer]]s and thus it is a [[puffer engine]].<ref>{{CiteLifeline|vol=9|pages=page 5}}</ref>
 
== Occurrence ==
{{main|List of natural spaceships}}
A lightweight Schick engine first appeared [[natural]]ly on February 12th, 2019,<ref name="post70479" /> having previously emerged (along with its middleweight and heavyweight variants) from symmetric soups on [[Catagolue]].<ref name="post14978" /><ref name="post17658" /><ref name="post28997" /> A second natural Schick engine appeared in October 2020.<ref name="post105674" />
 
Notably, a middleweight Schick engine appeared [[semi-natural]]ly on February 13th, 2022,<ref name="post141611" /> in the symmetry C2_2, which is a rotational symmetry and thus would not be predisposed to produce such an object. It has yet to occur naturally.
 
== Glider synthesis ==
An {{gliders|11}} [[Glider synthesis|synthesis]] for the lightweight Schick engine was found by [[Douglas G. Petrie]] in {{year|1973}}.<ref>{{CiteLifeline|vol=11|pages=page 19}}</ref>
 
== Table ==
{{Schick engines table}}
 
== See also ==
* [[Big A]]
* [[54P12H6V0]]
* [[Blinker ship 1]]
* [[Crown]]
 
== References ==
<references>
<ref name="post70479">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 70479
|author = Adam P. Goucher
|date  = February 12, 2019
}}</ref>
<ref name="post14978">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 14978
|author = Richard Schank
|date  = December 14, 2014
}}</ref>
<ref name="post17658">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 17658
|author = Richard Schank
|date  = March 10, 2015
}}</ref>
<ref name="post28997">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 28997
|author = gmc_nxtman
|date  = March 20, 2016
}}</ref>
<ref name="post105674">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 105674
|author = bubblegum
|date  = October 5, 2020
}}</ref>
<ref name="post141611">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 141611
|author = dani
|date  = February 13, 2022
}}</ref>
</references>
 
== External links ==
* {{LinkLexicon|lex_s.htm#schickengine}}
<!-- * {{LinkEppstein|13374|patternname=The Schick Engine (glider 13374)}} The Schick Engine (glider 13374) at David Eppstein's Glider Database http://fano.ics.uci.edu/ca/gliders/g13374.html -->
* {{LinkEppsteinRule|rule=b3s23|rulename=Life (B3/S23)|archivedate=20160309235206}} <!-- The Schick Engine (glider 13374), size 9x15, speed c/2, orthogonal, period 12 -->
* {{LinkPentadecathlonObject|39P12H6V0.1}}
* {{cite web
|url  = https://web.archive.org/web/20200510052724/http://www.pentadecathlon.com/objects/class4/typeB/TTetromino/TTetromino.php
|title = Puffers
|work  = [[Game of Life News|Game of Life Information]], Class 4 Objects Catalog, Type B -- Puffer Trains
}}


==External links==
{{LinkWeisstein|SchickEngine.html}}
{{LinkLexicon|lex_s.htm#schickengine}}
[[Category:Tagalongs]]
[[Category:Smoking ships]]
[[Category:Smoking ships]]
[[Category:Puffer engines]]
[[Category:Puffer engines]]
[[Category:Lists of patterns with synthesis costs]]
{{natural}}
__NOTOC__

Latest revision as of 11:31, 26 April 2026

Schick engine
x = 20, y = 11, rule = B3/S23 bo2bo$o$o3bo$4o9b2o$6b3o5b2o$6b2ob2o6b3o$6b3o5b2o$4o9b2o$o3bo$o$bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ TRACKLOOP 12 -1/2 0 THUMBSIZE 2 GPS 4 ]]
View animated image
View static image
Pattern type Tagalong
Spaceship
Number of cells 39
Bounding box 20 × 11
Frequency class 48
Direction Orthogonal
Period 12 (mod: 12)
Speed c/2 | 6c/12
Heat 43.2
Kinetic symmetry -c
Discovered by Paul Schick
Year of discovery 1972

The Schick engine (or Schick ship) can refer to one of four period-12 c/2 orthogonal spaceships which involve a flotilla of two standard spaceships pulling a period-12 tagalong consisting of a bullet heptomino and sparks. The term "Schick engine" may alternatively be used to refer to the tagalong alone, separately from the two spaceships supporting it.

This tagalong was found by Paul Schick in 1972. For about fifty years the 39-cell LWSS-on-LWSS variant of the Schick engine was the smallest known period-12 spaceship in terms of population, until it was displaced by the 35-cell 35P12H6V0 in February 2022.

The four possible spaceship types are displayed in a table below, with the tagalong portion highlighted in green.

Its eleven-cell rear spark can be perturbed by other c/2 spaceships to form a variety of puffers and thus it is a puffer engine.[1]

Occurrence

Main article: List of natural spaceships

A lightweight Schick engine first appeared naturally on February 12th, 2019,[2] having previously emerged (along with its middleweight and heavyweight variants) from symmetric soups on Catagolue.[3][4][5] A second natural Schick engine appeared in October 2020.[6]

Notably, a middleweight Schick engine appeared semi-naturally on February 13th, 2022,[7] in the symmetry C2_2, which is a rotational symmetry and thus would not be predisposed to produce such an object. It has yet to occur naturally.

Glider synthesis

An 11-glider synthesis for the lightweight Schick engine was found by Douglas G. Petrie in 1973.[8]

Table

Image Name Min. population Supporting flotilla apgcode Cost in gliders
Lightweight Schick engine 39 LWSS on LWSS (pseudo) xq12_fh1i0i1hfzw8sms8zxfjf 9
Middleweight Schick engine 42 MWSS on MWSS 1 xq12_v1120211vz01gpcpg1zxv7vzy01 11
Heavyweight Schick engine 44 HWSS on HWSS 1 xq12_v1120211vz120ioi021zw1vev1zx121 12
Asymmetric Schick engine 42 LWSS on HWSS 2 xq12_xupuzw27d72zu10109ghuz3221 11

See also

References

  1. ↑ Robert Wainwright (March 1973). Lifeline, vol 9, page 5.
  2. ↑ Adam P. Goucher (February 12, 2019). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  3. ↑ Richard Schank (December 14, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  4. ↑ Richard Schank (March 10, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  5. ↑ gmc_nxtman (March 20, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  6. ↑ bubblegum (October 5, 2020). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  7. ↑ dani (February 13, 2022). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  8. ↑ Robert Wainwright (September 1973). Lifeline, vol 11, page 19.


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