|rulespecial = [[Conway's Game of Life|Conway Life]]
|isorulemin = B3/S23
|isorulemin = B3/S23
|isorulemax = B3/S23
|isorulemax = B3/S23
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|pentadecathlonid = 149P96H8V8.1
|pentadecathlonid = 149P96H8V8.1
}}
}}
A '''3-engine Cordership''' is a [[c/12 diagonal]] [[spaceship]], specifically a [[Cordership]] consisting of three [[switch engine]]s. Shown in the infobox is the first example that was discovered by [[Paul Tooke]] on January 12, {{year|2004}}. It was the only known Cordership of this type until September 15, {{year|2020}}, when [[wwei23]] discovered several new ones with different timings between three engines.<ref name="post104102" /> The rest of this article only deals with Tooke's original 3-engine Cordership.
A '''3-engine Cordership''' is a [[c/12 diagonal]] [[spaceship]], specifically a [[Cordership]] consisting of three [[switch engine]]s. Shown in the infobox is the first example that was discovered by [[Paul Tooke]] on January 12, {{year|2004}}. It was the only known Cordership of this type until September 15, {{year|2020}}, when [[Aleph]] discovered several new ones with different timings between three engines.<ref name="post104102" /> The rest of this article only deals with Tooke's original 3-engine Cordership.
It was once the Cordership that used the fewest number of known possible [[switch engine]]s, although the [[4-engine Cordership]] is smaller in terms of minimum population. Later, both were surpassed by [[2-engine Cordership]] in 2017.
It was once the Cordership that used the fewest number of known possible [[switch engine]]s, although the [[4-engine Cordership]] is smaller in terms of minimum population. Later, both were surpassed by [[2-engine Cordership]] in 2017.
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As found by [[Jason Summers]], the 3-engine Cordership can easily be destroyed by three [[eater 1]]s and four [[block]]s, as shown to the left below. [[David Bell]] discovered in {{year|2005}} that the 3-engine Cordership can turn a [[lightweight spaceship]] 90 degrees with a [[spark]] similar to [[Twin bees shuttle spark|the one from twin bees shuttle]], as shown to the right.<ref>{{LinkGoLNews|2005/06/new_compact_corderships.html|title=New Compact Corderships|date=June 18, 2005|author=Dave Greene}}</ref>
As found by [[Jason Summers]], the 3-engine Cordership can easily be destroyed by three [[eater 1]]s and four [[block]]s, as shown to the left below. [[David Bell]] discovered in {{year|2005}} that the 3-engine Cordership can turn a [[lightweight spaceship]] 90 degrees with a [[spark]] similar to [[Twin bees shuttle spark|the one from twin bees shuttle]], as shown to the right.<ref>{{LinkGoLNews|2005/06/new_compact_corderships.html|title=New Compact Corderships|date=June 18, 2005|author=Dave Greene}}</ref>
{|
{| style="margin:auto;width:360px"
|{{EmbedViewer
|{{EmbedViewer
|pname = 3enginecordershipeater
|pname = 3enginecordershipeater
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|viewerconfig = [[ ZOOM 4 HEIGHT 450 ]]
|viewerconfig = [[ ZOOM 4 HEIGHT 450 ]]
}}
}}
|-
|{{EmbedViewer
|{{EmbedViewer
|pname = 3enginecordershiplwssreflection
|pname = 3enginecordershiplwssreflection
|position = center
|position = center
|caption = 3-engine Cordership about to reflect a lightweight spaceship by 90 degrees<br>
|caption = 3-engine Cordership about to reflect a lightweight spaceship by 90 degrees
|viewerconfig = [[ ZOOM 4 ]]
|viewerconfig = [[ ZOOM 4 ]]
}}
}}
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== Synthesis and related constructions ==
== Synthesis and related constructions ==
A 15-glider [[synthesis]] was found early on and used in several constructions, including a period-690 [[gun]] (based on [[period-690 glider gun]]) and a period-240 [[c/2 orthogonal]] [[rake]], both of which were published on January 19, {{year|2004}}.
A 15-glider [[synthesis]] was found early on and used in several constructions, including a period-690 [[gun]] (based on [[period-690 glider gun]]) and a period-240 [[c/2 orthogonal]] [[rake]], both of which were published on January 19, {{year|2004}}.
|caption = Period-690 3-engine Cordership gun by Paul Tooke<ref><tt>Patterns/Life/Guns/p690-PT-Cordership-gun.rle</tt> from [[Golly]]'s pattern collection</ref>
|caption = Period-690 3-engine Cordership gun by Paul Tooke<ref>{{CiteGollyPatternCollection|Patterns/Life/Guns/p690-PT-Cordership-gun.rle}}</ref>
|caption = Period-240 3-engine Cordership rake by Jason Summers<ref><tt>Patterns/Life/Rakes/c2-Cordership-rake.rle</tt> from [[Golly]]'s pattern collection</ref>
|caption = Period-240 3-engine Cordership rake by Jason Summers<ref>{{CiteGollyPatternCollection|Patterns/Life/Rakes/c2-Cordership-rake.rle}}</ref>
}}
}}
|}
|}
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In 2009, [[Dave Greene]] discovered a glider synthesis for upgrading a switch engine to a wing, which can be repeated to form the complete Cordership. [[Adam P. Goucher]] then built a [[Herschel]] [[conduit]] to convert a glider into a 3-engine Cordership.<ref>{{cite web|url=http://b3s23life.blogspot.com/2009/02/first-complete-glider-to-cordership.html |title=First complete glider-to-Cordership converter |publisher=Dave Greene |date=February 7, 2009 |accessdate=June 15, 2009}}</ref>
In 2009, [[Dave Greene]] discovered a glider synthesis for upgrading a switch engine to a wing, which can be repeated to form the complete Cordership. [[Adam P. Goucher]] then built a [[Herschel]] [[conduit]] to convert a glider into a 3-engine Cordership.<ref>{{cite web|url=http://b3s23life.blogspot.com/2009/02/first-complete-glider-to-cordership.html |title=First complete glider-to-Cordership converter |publisher=Dave Greene |date=February 7, 2009 |accessdate=June 15, 2009}}</ref>
In March 2017, thanks to [[Luka Okanishi]]'s discovery of a [[Three-glider collision|three-glider synthesis]] for a switch engine, the minimal recipe for a 3-engine Cordership was reduced to {{gliders|11|brief}} gliders.
In March 2017, thanks to [[Luka Okanishi]]'s discovery of a [[Three-glider collision|three-glider synthesis]] for a switch engine, the minimal recipe for a 3-engine Cordership was reduced to {{gliders|11|text=11 gliders}}.
A 3-engine Cordership is a c/12 diagonalspaceship, specifically a Cordership consisting of three switch engines. Shown in the infobox is the first example that was discovered by Paul Tooke on January 12, 2004. It was the only known Cordership of this type until September 15, 2020, when Aleph discovered several new ones with different timings between three engines.[1] The rest of this article only deals with Tooke's original 3-engine Cordership.
It was once the Cordership that used the fewest number of known possible switch engines, although the 4-engine Cordership is smaller in terms of minimum population. Later, both were surpassed by 2-engine Cordership in 2017.
3-engine Cordership about to reflect a lightweight spaceship by 90 degrees (click above to open LifeViewer) RLE:herePlaintext:here
The spark from 3-engine Cordership can also reflect a glider, which was used in the original 269-cell form of sawtooth 260.
Synthesis and related constructions
A 15-glider synthesis was found early on and used in several constructions, including a period-690 gun (based on period-690 glider gun) and a period-240 c/2 orthogonalrake, both of which were published on January 19, 2004.
In 2009, Dave Greene discovered a glider synthesis for upgrading a switch engine to a wing, which can be repeated to form the complete Cordership. Adam P. Goucher then built a Herschelconduit to convert a glider into a 3-engine Cordership.[5]
