Pre-pulsar spaceship

	Pre-pulsar spaceship
	<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 69, y = 13, rule = B3/S23 31bo5bo$30b3o3b3o4$2b2o5b2o5b2o5b2o19b2o5b2o5b2o5b2o$o3bo3bo2bo3bo2bo 3bo3bo15bo3bo3bo2bo3bo2bo3bo3bo$o3bobob3o5b3obobo3bo15bo3bobob3o5b3obo bo3bo$o5b2o2b3ob3o2b2o5bo15bo5b2o2b3ob3o2b2o5bo$2ob3o15b3ob2o15b2ob3o 15b3ob2o$o25bo15bo25bo$bo3bo15bo3bo17bo3bo15bo3bo$2bo2bo15bo2bo19bo2bo 15bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ GPS 5 ZOOM 7 TRACKLOOP 30 0 -1/5 ]]</nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
	<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 69, y = 13, rule = B3/S23 31bo5bo$30b3o3b3o4$2b2o5b2o5b2o5b2o19b2o5b2o5b2o5b2o$o3bo3bo2bo3bo2bo 3bo3bo15bo3bo3bo2bo3bo2bo3bo3bo$o3bobob3o5b3obobo3bo15bo3bobob3o5b3obo bo3bo$o5b2o2b3ob3o2b2o5bo15bo5b2o2b3ob3o2b2o5bo$2ob3o15b3ob2o15b2ob3o 15b3ob2o$o25bo15bo25bo$bo3bo15bo3bo17bo3bo15bo3bo$2bo2bo15bo2bo19bo2bo 15bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ GPS 5 ZOOM 7 TRACKLOOP 30 0 -1/5 ]]</nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
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Pattern type	Spaceship
Number of cells	128
Bounding box	73×14
Direction	Orthogonal
Period	30
Mod	30
Speed	c/5
Speed (unsimplified)	6c/30
Heat	131.5
Discovered by	David Bell
Year of discovery	1998
Rules
Outer-totalistic rules	B3/S23 – B3/S238
Important rules	Conway Life
# of rules	21 = 2
Isotropic rules	B3/S23-c – B3/S234c5jn6n7c8
Glider synthesis
Fewest gliders	531 (32†)
Catagolue-generated RLE	prepulsarspaceship_synth.rle
	†Can be constructed with 32 gliders using the reverse caber tosser universal constructor.
Pattern files
Plaintext	prepulsarspaceship.cells
RLE	prepulsarspaceship.rle
Identifiers
apgcode	xq30_yq232x232zug1hmgc865da808ad568cgmh1guybug1hmgc865da808ad568cgmh1guz124w6yb6w421yb124w6yb6w421
Pentadecathlon ID	128P30H6V0.1

Pre-pulsar spaceship (or PPS for short) is any of three different period-30 c/5 orthogonal spaceships in which a pre-pulsar is pushed by a pair of spiders. The back sparks of these spaceships can be used to perturb gliders in many different ways, allowing the easy construction of c/5 puffers.

The first pre-pulsar spaceship, the symmetric pre-pulsar spaceship (or SPPS for short, shown to the right) was found by David Bell in May 1998 and was based on the p15 pre-pulsar spaceship found by Noam Elkies in December 1997.

The asymmetric pre-pulsar spaceship (or APPS, shown below) was found by Alan Hensel, also in May 1998, based on a skewed version of the pre-pulsar.

The glide symmetric pre-pulsar spaceship (or GPPS, shown below) was also found by David Bell in May 1998. It is similar to the symmetric pre-pulsar spaceship but contains an extra T-tetromino between the spiders and is glide symmetric.

Martin Grant's 601-glider spider synthesis resulted in a 1212-glider synthesis for the symmetric pre-pulsar spaceship on March 8, 2019.[1]

In June 1998, David Bell found reactions to convert between the symmetric and glide-symmetric forms of the p30 pre-pulsar spaceship.^{[citation needed]}

Image gallery

The asymmetric pre-pulsar spaceship.
Download RLE: click here

The glide symmetric pre-pulsar spaceship.
Download RLE: click here

gollark: You UTTER.

gollark: Perhaps part of them involves convincing us that you're a ””human”” and not lunar-adapted camel or y=tan(10x)/10+x.

gollark: Unfathomable grand plans?

gollark: Lying again².

gollark: He's lying again.

References

Adam P. Goucher (March 8, 2019). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums

External links

Pre-pulsar spaceship at the Life Lexicon

Symmetric pre-pulsar spaceship at Adam P. Goucher's Catagolue

Asymmetric pre-pulsar spaceship at Adam P. Goucher's Catagolue (extended)

Glide symmetric pre-pulsar spaceship at Adam P. Goucher's Catagolue

128P30H6V0.1 at Heinrich Koenig's Game of Life Object Catalogs

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[post72731-1] Adam P. Goucher (March 8, 2019). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums