25P3H1V0.2

	25P3H1V0.2
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Pattern type	Spaceship
Number of cells	25
Bounding box	16×8
Direction	Orthogonal
Period	3
Mod	3
Speed	c/3
Speed (unsimplified)	c/3
Heat	21.3
Discovered by	David Bell
Year of discovery	1992
Rules
Outer-totalistic rules	B3/S23 – B378/S23678
Important rules	Conway Life
# of rules	25 = 32
Isotropic rules	B3-e/S2-n3-cry – B2n34ceqw5jkq6-k78/S234acewy5-ij678
Glider synthesis
Fewest gliders	26 (17†)
Catagolue-generated RLE	25p3h1v0.2_synth.rle
Uploaded synthesis RLE	25p3h1v0.2_synth.rle
	†Can be constructed with 17 gliders using the reverse caber tosser universal constructor.
Pattern files
Plaintext	25p3h1v0.2.cells
RLE	25p3h1v0.2.rle
Identifiers
apgcode	xq3_km92z1d9czxor33zy11
Pentadecathlon ID	25P3H1V0.2

25P3H1V0.2 is a c/3 orthogonal edge-repair spaceship that was found by David Bell in 1992. With 25 cells, it is tied with 25P3H1V0.1 as the smallest c/3 spaceship.^[1] The final step for a glider synthesis of this ship was found by Martin Grant on December 15, 2017,^[2] which was turned into a complete 26-glider synthesis on December 31 due to contributions by various people.^[3]

References

↑ c3.rle from Stephen Silver's January 12, 2004 'ships' collection.
↑ Martin Grant (December 15, 2017). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
↑ Chris Cain (December 31, 2017). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums