3-engine Cordership - Revision history

Hotcrystal0 at 12:56, 19 July 2026

2026-07-19T12:56:35Z

← Older revision		Revision as of 12:56, 19 July 2026
Line 27:		Line 27:
	\|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.
Line 83:		Line 83:
	\|p = 104102		\|p = 104102
	\|title = Re: Thread For Your Unsure Discoveries		\|title = Re: Thread For Your Unsure Discoveries
	\|author = ~~wwei23~~		\|author = Aleph
	\|date = September 15, 2020		\|date = September 15, 2020
	}}</ref>		}}</ref>

Neocaridina at 11:56, 23 January 2026

2026-01-23T11:56:11Z

← Older revision		Revision as of 11:56, 23 January 2026
Line 95:		Line 95:
	[[Category:Non-monotonic spaceships]]		[[Category:Non-monotonic spaceships]]
	[[Category:Patterns involving switch engines]]		[[Category:Patterns involving switch engines]]

	__NOTOC__		__NOTOC__

Neocaridina at 23:49, 17 January 2026

2026-01-17T23:49:04Z

← Older revision		Revision as of 23:49, 17 January 2026
Line 17:		Line 17:
	\|rulemin = B3/S23		\|rulemin = B3/S23
	\|rulemax = B3/S23		\|rulemax = B3/S23
	~~\|rulespecial = [[Conway's Game of Life\|Conway Life]]~~
	\|isorulemin = B3/S23		\|isorulemin = B3/S23
	\|isorulemax = B3/S23		\|isorulemax = B3/S23

Muzik at 17:25, 9 August 2024

2024-08-09T17:25:33Z

← Older revision		Revision as of 17:25, 9 August 2024
Line 1:		Line 1:
	{{Spaceship		{{Spaceship
	\|name = 3-engine Cordership		\|name = 3-engine Cordership
	\|pname = 3enginecordership		\|pname = 3enginecordership
	\|family = Cordership		\|family = Cordership
	\|c = 149		\|c = 149
	\|bx = 58		\|bx = 58
	\|by = 65		\|by = 65
	\|dir = Diagonal		\|dir = Diagonal
	\|p = 96		\|p = 96
	\|m = 48		\|m = 48
	\|s = c/12		\|s = c/12
	\|z = 8c/96		\|z = 8c/96
	\|h = 156.1		\|h = 156.1
	\|symmetry = n/		\|symmetry = n/
	\|discoverer = Paul Tooke		\|discoverer = Paul Tooke
	\|discoveryear = 2004		\|discoveryear = 2004
	\|rulemin = B3/S23		\|rulemin = B3/S23
	\|rulemax = B3/S23		\|rulemax = B3/S23
	\|rulespecial = [[Conway's Game of Life\|Conway Life]]		\|rulespecial = [[Conway's Game of Life\|Conway Life]]
	\|isorulemin = B3/S23		\|isorulemin = B3/S23
	\|isorulemax = B3/S23		\|isorulemax = B3/S23
	\|synthesis = 11		\|synthesis = 11
	\|synthesisRLE = true		\|synthesisRLE = true
	\|plaintext = true		\|plaintext = true
	\|rle = true		\|rle = true
	\|viewerconfig = #C [[ ZOOM 8 TRACKLOOP 96 -1/12 -1/12 THUMBSIZE 2 GPS 12 HEIGHT 640 WIDTH 640 ]]		\|viewerconfig = #C [[ ZOOM 8 TRACKLOOP 96 -1/12 -1/12 THUMBSIZE 2 GPS 12 HEIGHT 640 WIDTH 640 ]]
	\|apgcode = xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07		\|apgcode = xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07
	\|pentadecathlonid = 149P96H8V8.1		\|pentadecathlonid = 149P96H8V8.1
	}}		}}

Muzik at 17:24, 9 August 2024

2024-08-09T17:24:01Z

← Older revision		Revision as of 17:24, 9 August 2024
Line 1:		Line 1:
	{{Spaceship		{{Spaceship
	\|name = 3-engine Cordership		\|name = 3-engine Cordership
	\|pname = 3enginecordership		\|pname = 3enginecordership
	\|family = Cordership		\|family = Cordership
	\|c = 149		\|c = 149
	\|bx = 58		\|bx = 58
	\|by = 65		\|by = 65
	\|dir = Diagonal		\|dir = Diagonal
	\|p = 96		\|p = 96
	\|m = 48		\|m = 48
	\|s = c/12		\|s = c/12
	\|z = 8c/96		\|z = 8c/96
	\|h = 156.1		\|h = 156.1
	\|discoverer = Paul Tooke		\|symmetry = n/
	\|discoveryear = 2004		\|discoverer = Paul Tooke
	\|rulemin = B3/S23		\|discoveryear = 2004
	\|rulemax = B3/S23		\|rulemin = B3/S23
	\|rulespecial = [[Conway's Game of Life\|Conway Life]]		\|rulemax = B3/S23
	\|isorulemin = B3/S23		\|rulespecial = [[Conway's Game of Life\|Conway Life]]
	\|isorulemax = B3/S23		\|isorulemin = B3/S23
	\|synthesis = 11		\|isorulemax = B3/S23
	\|synthesisRLE = true		\|synthesis = 11
	\|plaintext = true		\|synthesisRLE = true
	\|rle = true		\|plaintext = true
	\|viewerconfig = #C [[ ZOOM 8 TRACKLOOP 96 -1/12 -1/12 THUMBSIZE 2 GPS 12 HEIGHT 640 WIDTH 640 ]]		\|rle = true
	\|apgcode = xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07		\|viewerconfig = #C [[ ZOOM 8 TRACKLOOP 96 -1/12 -1/12 THUMBSIZE 2 GPS 12 HEIGHT 640 WIDTH 640 ]]
			\|apgcode = xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07
	\|pentadecathlonid = 149P96H8V8.1		\|pentadecathlonid = 149P96H8V8.1
	}}		}}
Line 34:		Line 35:
	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;"		{\| style="margin:auto;width:360px"
	\|{{EmbedViewer		\|{{EmbedViewer
	\|pname = 3enginecordershipeater		\|pname = 3enginecordershipeater
Line 53:		Line 54:

	== 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}}.

	{\|style="margin:auto;width:360px;"		{\| style="margin:auto;width:360px"
	\|{{EmbedViewer		\|{{EmbedViewer
	\|pname = 3enginecordershipgun		\|pname = 3enginecordershipgun
Line 75:		Line 75:
	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}}.		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}}.

	==See also==		== See also ==
	* {{CategoryLink\|Cordership variants}}		* {{CategoryLink\|Cordership variants}}

	==References==		== References ==
	<references>		<references>
	<ref name="post104102">{{LinkForumThread		<ref name="post104102">{{LinkForumThread
Line 89:		Line 89:
	</references>		</references>

	==External links==		== External links ==
	* {{LinkCatagolue\|xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07\|format=extended}}		* {{LinkCatagolue\|xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07\|format=extended}}
	* {{LinkPentadecathlonObject\|149P96H8V8.1}}		* {{LinkPentadecathlonObject\|149P96H8V8.1}}
Line 95:		Line 95:
	[[Category:Engineered spaceships]]		[[Category:Engineered spaceships]]
	[[Category:Non-monotonic spaceships]]		[[Category:Non-monotonic spaceships]]
	~~[[Category:Glide symmetric spaceships]]~~
	[[Category:Patterns involving switch engines]]		[[Category:Patterns involving switch engines]]

	__NOTOC__		__NOTOC__

GUYTU6J: /* Synthesis and related constructions */ formatting

2022-12-17T08:58:03Z

Synthesis and related constructions: formatting

← Older revision		Revision as of 08:58, 17 December 2022
Line 61:		Line 61:
	\|position = center		\|position = center
	\|viewerconfig = #C [[ ZOOM 2 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]		\|viewerconfig = #C [[ ZOOM 2 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]
	\|caption = Period-690 3-engine Cordership gun by Paul Tooke<ref>{{~~filename~~\|Patterns/Life/Guns/p690-PT-Cordership-gun.rle}} ~~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>
	}}		}}
	\|{{EmbedViewer		\|{{EmbedViewer
Line 67:		Line 67:
	\|position = center		\|position = center
	\|viewerconfig = #C [[ ZOOM 1 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]		\|viewerconfig = #C [[ ZOOM 1 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]
	\|caption = Period-240 3-engine Cordership rake by Jason Summers<ref>{{~~filename~~\|Patterns/Life/Rakes/c2-Cordership-rake.rle}} ~~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>
	}}		}}
	\|}		\|}

Confocal: formatting, links

2022-10-05T05:50:25Z

formatting, links

← Older revision		Revision as of 05:50, 5 October 2022
Line 34:		Line 34:
	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
Line 41:		Line 41:
	\|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 ]]
	}}		}}
Line 55:		Line 56:
	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}}.

	{\|		{\|style="margin:auto;width:360px;"
	\|{{EmbedViewer		\|{{EmbedViewer
	\|pname = 3enginecordershipgun		\|pname = 3enginecordershipgun
	\|position = center		\|position = center
	\|viewerconfig = #C [[ ZOOM 2 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]		\|viewerconfig = #C [[ ZOOM 2 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]
	\|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>{{filename\|Patterns/Life/Guns/p690-PT-Cordership-gun.rle}} from [[Golly's pattern collection]]</ref>
	}}		}}
	\|{{EmbedViewer		\|{{EmbedViewer
Line 66:		Line 67:
	\|position = center		\|position = center
	\|viewerconfig = #C [[ ZOOM 1 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]		\|viewerconfig = #C [[ ZOOM 1 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]
	\|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>{{filename\|Patterns/Life/Rakes/c2-Cordership-rake.rle}} from [[Golly's pattern collection]]</ref>
	}}		}}
	\|}		\|}
Line 72:		Line 73:
	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}}.

	==See also==		==See also==
	* ~~[[:Category:Corderships~~\|~~List of Corderships]]~~		* {{CategoryLink\|Cordership variants}}

	==References==		==References==

Confocal: this was an opportunity to make a few minor linking/formatting fixes in one edit

2022-07-16T21:54:13Z

this was an opportunity to make a few minor linking/formatting fixes in one edit

← Older revision		Revision as of 21:54, 16 July 2022
Line 72:		Line 72:
	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 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\|brief}} gliders.

	==See also==		==See also==
	*[[:Category:Corderships\|List of Corderships]]		* [[:Category:Corderships\|List of Corderships]]

	==References==		==References==
Line 89:		Line 89:

	==External links==		==External links==
	{{LinkCatagolue\|xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07\|format=extended}}		* {{LinkCatagolue\|xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07\|format=extended}}
	{{LinkPentadecathlonObject\|149P96H8V8.1}}		* {{LinkPentadecathlonObject\|149P96H8V8.1}}

	[[Category:Engineered spaceships]]		[[Category:Engineered spaceships]]
	[[Category:Non-monotonic spaceships]]		[[Category:Non-monotonic spaceships]]
	[[Category:~~glide~~ symmetric spaceships]]		[[Category:Glide symmetric spaceships]]
	[[Category:Patterns involving switch engines]]		[[Category:Patterns involving switch engines]]

	__NOTOC__		__NOTOC__

Atavoidirc at 21:25, 16 July 2022

2022-07-16T21:25:46Z

← Older revision		Revision as of 21:25, 16 July 2022
Line 95:		Line 95:
	[[Category:Non-monotonic spaceships]]		[[Category:Non-monotonic spaceships]]
	[[Category:glide symmetric spaceships]]		[[Category:glide symmetric spaceships]]
			[[Category:Patterns involving switch engines]]

	__NOTOC__		__NOTOC__

GUYTU6J: the contents about p690 gun and p240 rake moved here

2022-06-03T15:54:15Z

the contents about p690 gun and p240 rake moved here

← Older revision		Revision as of 15:54, 3 June 2022
Line 23:		Line 23:
	\|plaintext = true		\|plaintext = true
	\|rle = true		\|rle = true
	\|viewerconfig = #C [[ ZOOM 4 TRACKLOOP 96 -1/12 -1/12 THUMBSIZE 2 GPS 12 HEIGHT ~~480~~ WIDTH ~~480~~ ]]		\|viewerconfig = #C [[ ZOOM 8 TRACKLOOP 96 -1/12 -1/12 THUMBSIZE 2 GPS 12 HEIGHT 640 WIDTH 640 ]]
	\|apgcode = xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07		\|apgcode = xq96_ya33zy2ooy0ccimzyc73goozgo042kcy7cga3z1h9hyeo0gzw1yboow13631z0guh07zykgoo488y9goggwko8zyk262ybc1e08bzyqgo042kcy5o48zyq1h9hya24y233zys1yboozyrguh07
	\|pentadecathlonid = 149P96H8V8.1		\|pentadecathlonid = 149P96H8V8.1
	}}		}}
	~~The~~ '''3-engine Cordership''' is a [[c/12 diagonal]] [[spaceship]] that was discovered by [[Paul Tooke]] on January 12, {{year\|2004}}. ~~Until the [[2-engine Cordership]] was found, it~~ was the [[Cordership~~]] that used the fewest number~~ of ~~known possible [[switch engine]]s. Despite~~ this, ~~the~~ [[~~4-engine Cordership~~]] ~~is smaller in terms~~ of ~~minimum population (the [[2~~-engine Cordership~~]] beating both)~~.		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.

	~~[[David Bell]] discovered in {{year\|2005}} that~~ the ~~3-engine~~ Cordership ~~can be~~ used ~~to turn a~~ [[~~lightweight spaceship~~]] ~~90 degrees as shown below.<ref>{{LinkGoLNews\|2005/06/new_compact_corderships.html\|title=New Compact Corderships\|date=June 18~~, ~~2005\|author=Dave Greene}}</ref> It could be~~ [[~~glider synthesis\|constructed~~]] ~~with 15 [[glider]]s~~, ~~and Tooke created a~~ [[~~gun]] for this spaceship only a week after its original construction (see [[3~~-engine Cordership ~~gun~~]]~~). In March~~ 2017 ~~Luka Okanishi discovered a three-glider synthesis for a switch engine, which reduced the recipe to only 11 gliders~~.<ref>{{cite web\|url=https://conwaylife.com/forums/viewtopic.php?f=2&t=279&p=41558#p41557 \|title=Re: Thread For Your Accidental Discoveries\|publisher=Luka Okanishi\|date=March 12, 2017\|accessdate=March 13, 2017}}</ref>		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.

	~~The~~ 3-engine Cordership can easily be destroyed by three [[eater 1]]s and four [[block]]s, as shown below. ~~This cleanup reaction was found by~~ [[~~Jason Summers~~]].		== Reactions ==
			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>

	~~On September 15, 2020,~~ [[~~wwei23~~]] ~~discovered several variant~~ 3-engine ~~Corderships, including one that cleans up its trailing blocks with sideways gliders, similar~~ to a [[~~5-in~~-a~~-row Cordership\|5-~~]], ~~[[6-~~in-~~a-row Cordership\|6-]], or~~ [[~~7-in-a-row Cordership~~]].<ref>{{cite web\|url=https://conwaylife.com/forums/viewtopic.php?p=104102#p104102\|title=Re: Thread For Your Unsure Discoveries\|publisher=wwei23\|date=September 15, 2020\|accessdate=September 28, 2020}}</ref>		{\|
			\|{{EmbedViewer
			\|pname = 3enginecordershipeater
			\|position = center
			\|caption = 3-engine Cordership eater using eater 1s and blocks
			\|viewerconfig = [[ ZOOM 4 HEIGHT 450 ]]
			}}
			\|{{EmbedViewer
			\|pname = 3enginecordershiplwssreflection
			\|position = center
			\|caption = 3-engine Cordership about to reflect a lightweight spaceship by 90 degrees<br>
			\|viewerconfig = [[ ZOOM 4 ]]
			}}
			\|}

			The spark from 3-engine Cordership can also reflect a [[glider]], which was used in the original 269-cell form of [[sawtooth 260]].

	==~~Incremental construction~~==		== Synthesis and related constructions ==

	[[~~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>~~		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}}.

	~~==Image gallery==~~
	{\|		{\|
	\|-
	\|{{EmbedViewer		\|{{EmbedViewer
	\|pname = ~~3enginecordershipeater~~		\|pname = 3enginecordershipgun
	\|position = center		\|position = center
	\|caption = 3-engine Cordership ~~eater using~~ [[~~eater 1]]s and [[block~~]]s<br>		\|viewerconfig = #C [[ ZOOM 2 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]
	~~\|viewerconfig = [[ ZOOM 5 HEIGHT 480 ]]~~		\|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>
	}}		}}
	\|{{EmbedViewer		\|{{EmbedViewer
	\|pname = ~~3enginecordershiplwssreflection~~		\|pname = 3enginecordershiprake
	\|position = center		\|position = center
	\|caption = 3-engine Cordership ~~about to reflect a lightweight spaceship~~ by ~~90 degrees~~<br>		\|viewerconfig = #C [[ ZOOM 1 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]
	~~\|viewerconfig =~~ [[ ~~ZOOM 6 HEIGHT 480~~ ]]		\|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>
	}}		}}
	\|}		\|}

			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 synthesis for a switch engine, the minimal recipe for a 3-engine Cordership was reduced to {{gliders\|11\|brief}} gliders.

	==See also==		==See also==
	*[[:Category:Corderships\|List of Corderships]]		*[[:Category:Corderships\|List of Corderships]]
	*[[Sawtooth 260]]

	==References==		==References==
	<references />		<references>
			<ref name="post104102">{{LinkForumThread
			\|format = ref
			\|p = 104102
			\|title = Re: Thread For Your Unsure Discoveries
			\|author = wwei23
			\|date = September 15, 2020
			}}</ref>
			</references>

	==External links==		==External links==