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{{Glossary}}
{{Glossary}}
A '''crawler''' or '''climber''' is a reaction in which two objects (or groups of) collide, leaving one of the objects moved backwards or forwards to a degree, and the other forward. Crawler reactions are commonly used to create [[Spaceship#Engineered spaceships|engineered spaceship]]s, also known as caterpillars.
A '''crawler''' or '''climber''' is a [[reaction]] in which two objects (or groups of objects) [[Collision|collide]], leaving one of the objects moved backwards or forwards to a degree, and the other forward. Crawler reactions are commonly used to create [[engineered spaceship]]s, also known as caterpillars.


== List of crawlers ==
== List of crawlers ==
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=== (31,5)c/137 climber ===
=== (31,5)c/137 climber ===
This has been discussed somewhat as of late 2022.<ref>https://conwaylife.com/forums/viewtopic.php?f=2&t=5867</ref>
This has been discussed somewhat as of late 2022.<ref name="thread5867"/>


=== (10,7)c/75 climber ===
=== (10,7)c/75 climber ===
A spaceship based on this fuse has also been discussed, however its potential is doubtful.<ref>https://conwaylife.com/forums/viewtopic.php?f=2&t=6025</ref>
A spaceship based on this fuse has also been discussed, however its potential is doubtful.<ref name="thread6025" />


=== Half-bakery reaction ===
=== Half-bakery reaction ===
Line 57: Line 57:
<ref name="post10028">{{LinkForumThread
<ref name="post10028">{{LinkForumThread
|format = ref
|format = ref
|p      = 10028
|title  = Caterpillar's little brother research
|title  = Caterpillar's little brother research
|p      = 10028
|author = Ivan Fomichev
|author = Ivan Fomichev
|date  = December 8, 2013
|date  = December 8, 2013
}}</ref>
<ref name="post10714">{{LinkForumThread
|format = ref
|p      = 10714
|title  = Interesting simple fuses
|author = Sphenocorona
|date  = February 9, 2014
}}</ref>
<ref name="post13104">{{LinkForumThread
|format = ref
|p      = 13104
|title  = Re: Interesting simple fuses
|author = Sphenocorona
|date  = September 6, 2014
}}</ref>
}}</ref>
<ref name="post15241">{{LinkForumThread
<ref name="post15241">{{LinkForumThread
|format = ref
|format = ref
|p      = 15241
|title  = (13,4)c/41 crawlers
|title  = (13,4)c/41 crawlers
|p      = 15241
|author = Ivan Fomichev
|author = Ivan Fomichev
|date  = December 26, 2014
|date  = December 26, 2014
}}</ref>
<ref name="post15549">{{LinkForumThread
|format = ref
|p      = 15549
|title  = HBK as Caterpillar
|author = Brett Berger
|date  = January 2, 2015
}}</ref>
}}</ref>
<ref name="post123822">{{LinkForumThread
<ref name="post123822">{{LinkForumThread
|format = ref
|format = ref
|p      = 123822
|title  = Re: (13,4)c/41 crawlers
|title  = Re: (13,4)c/41 crawlers
|p      = 123822
|author = C28
|author = C28
|date  = February 26, 2021
|date  = February 26, 2021
}}</ref>
}}</ref>
<ref name="post15549">{{LinkForumThread
<ref name="thread5867">{{LinkForumThread
|format = ref
|title  = HBK as Caterpillar
|p      = 15549
|author = Brett Berger
|date  = January 2, 2015
}}</ref>
<ref name="post13104">{{LinkForumThread
|format = ref
|format = ref
|title  = Re: Interesting simple fuses
|f      = 2
|p     = 13104
|t     = 5867
|author = Sphenocorona
|p      = 153737
|date  = September 6, 2014
|title  = (31,5)c/137 Caterpillar
}}</ref>
}}</ref>
<ref name="post10714">{{LinkForumThread
<ref name="thread6025">{{LinkForumThread
|format = ref
|format = ref
|title  = Interesting simple fuses
|f      = 2
|p     = 10714
|t     = 6025
|author = Sphenocorona
|p      = 162040
|date  = February 9, 2014
|title  = Can we make a (10,7)c/75 spaceship?
}}</ref>
}}</ref>
</references>
</references>


==External links==
==External links==
{{LinkForumThread|f=2|t=1182|title=13131: The B-Heptomino/Glider Spaceship Thread}}
* {{LinkForumThread|f=2|t=1182|title=13131: The B-Heptomino/Glider Spaceship Thread}}
{{LinkForumThread|f=2|t=1142|title=(23,5)c/79 spaceship components}}
* {{LinkForumThread|f=2|t=1142|title=(23,5)c/79 spaceship components}}
{{LinkForumThread|f=2|t=2130|title=(27,1)c/72 caterpillar challenge}}
* {{LinkForumThread|f=2|t=2130|title=(27,1)c/72 caterpillar challenge}}
{{LinkForumThread|f=2|t=2286|title=(34,7)c/156 caterpillar}}
* {{LinkForumThread|f=2|t=2286|title=(34,7)c/156 caterpillar}}
{{LinkForumThread|f=2|t=1539|title=(13,4)c/41 crawlers}}
* {{LinkForumThread|f=2|t=1539|title=(13,4)c/41 crawlers}}

Revision as of 14:32, 10 June 2023

A crawler or climber is a reaction in which two objects (or groups of objects) collide, leaving one of the objects moved backwards or forwards to a degree, and the other forward. Crawler reactions are commonly used to create engineered spaceships, also known as caterpillars.

List of crawlers

17c/45 pi heptomino crawler

Perhaps the first and most well known climber is the infamous 17c/45 reaction, consisting of pi heptomino running over a blinker, moving it back 6 cells and rephasing it, whilst the pi heptomino moves forward 17 cells. This takes place in 45 generations.

The reaction was known for a long time, however the idea of a spaceship powered by this reaction was mentioned much later in 2002 by David Bell who had discovered reactions between multiple pies, which emitted gliders. After much work, Gabriel Nivasch finished construction of caterpillar, the first 17c/45 orthogonal spaceship, on 31 December 2004.

Research has been conducted into building much smaller 17c/45 spaceships with pi crawlers, analogously to the silverfish. Discussion has been ongoing since as early as 2013.[1]

31c/240 Herschel crawler

Another orthogonal crawler, the 31c/240 reaction, consisting of a Herschel crawling though blocks.

Four 31c/240 spaceships are known, three of which use the crawler; shield bug, centipede, and silverfish. The fourth, centipede caterloopillar, relies on universal constructor technology instead of conventional crawlers.

(23,5)c/79 Herschel climber

The (23,5)c/79 Herschel climber involves a Herschel reacting with a stream of gliders, emitting more gliders behind it in the same way, displacing the Herschel by 23 cells vertically and 5 horizontally in the space of 79 generations. It can also crawl on certain still lifes as well as gliders.

This climber has been engineered and other components assembled by hand to create waterbear, which was the fastest known oblique spaceship until the discovery of Sir Robin in 2018.

(34,7)c/156 Herschel climber

The (34,7)c/156 Herschel climber is another notable oblique climber. An unnamed (34,7)c/156 caterpillar has been built using this climber.

(13,1)c/31 Pseudo-B climber

An interesting climber, the (13,1)c/31 Pseudo-B climber involves a climbing reaction that never isolates itself into a Herschel or B-heptomino. A spaceship based on it was first mentioned by Gabriel Nivasch as an afterthought on his caterpillar article.

No spaceships have been built with this reaction as of yet.

(27,1)c/72 Herschel climber

Much research has been conducted into a spaceship based on the (27,1)c/72 Herschel climber.

(13,4)c/41 climber

Consists of a B-heptomino climbing on gliders. Was initially proposed in 2014,[2] but no development started until 2021.[3]

(31,5)c/137 climber

This has been discussed somewhat as of late 2022.[4]

(10,7)c/75 climber

A spaceship based on this fuse has also been discussed, however its potential is doubtful.[5]

Half-bakery reaction

There is a well-known reaction in which a glider crashes into the side of a half-bakery, shifting the loaves and releasing a glider. This reaction has been used to create Half-baked knightship and parallel HBK, and research has been conducted into a potential caterpillar-like knightship using the reaction.[6]

Fuses which could be made into climbers

The following lists fuses which show potential for being made into workable climbers, but progress is yet to be made.

(8,1)c/32 p128 Herschel fuse

This fuse eats gliders, spitting out double the amount of gliders, but leaving blocks behind in the process.[7]

(40,7)c/244 Herschel fuse

Consuming blinkers, a new blinker is produced by a significant shift. However, a large cluster of debris is left in the other direction, making stabilisation appear challenging.[8]

References

  1. ↑ Ivan Fomichev (December 8, 2013). Caterpillar's little brother research (discussion thread) at the ConwayLife.com forums
  2. ↑ Ivan Fomichev (December 26, 2014). (13,4)c/41 crawlers (discussion thread) at the ConwayLife.com forums
  3. ↑ C28 (February 26, 2021). Re: (13,4)c/41 crawlers (discussion thread) at the ConwayLife.com forums
  4. ↑ (31,5)c/137 Caterpillar (discussion thread) at the ConwayLife.com forums
  5. ↑ Can we make a (10,7)c/75 spaceship? (discussion thread) at the ConwayLife.com forums
  6. ↑ Brett Berger (January 2, 2015). HBK as Caterpillar (discussion thread) at the ConwayLife.com forums
  7. ↑ Sphenocorona (September 6, 2014). Re: Interesting simple fuses (discussion thread) at the ConwayLife.com forums
  8. ↑ Sphenocorona (February 9, 2014). Interesting simple fuses (discussion thread) at the ConwayLife.com forums
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