New c/3 ships

[beebop]

Here are some short wide c/3 spaceships found using lifesrc.

Code: Select all

x = 43, y = 7, rule = B3/S23
7b2o14bo$4b2ob2o10b3ob3o$b4o2b2o4b2o3bo6b2o$o4bo4b2ob2o4b2o3bo2bo5b3ob
2obo$b2o7b2o3bo13bob2o4b2ob2o$10b2o17b2o3bo2bobo2bo$27bo3bo3bo5bo!

[Sokwe]

The first spaceship is one of the small edge-repair spaceships discovered by David Bell in 1992. The second ship is known and can be found in Stephen Silver's 'ships' collection (available here). Small period-3 spaceships are unlikely to be new at this point. As I mentioned in this post, c/3 components can usually be searched for directly when needed. There are, however, a number of desired p3 ships that have not yet been found, such as a ship that converts a forward *WSS into a forward glider quickly enough that it could be used to make relatively low-period engineless rakes.

The following external links give a fairly comprehensive overview of current c/3 technology:

• Speed c/3 Technology in Conway's Life - An article by David Bell describing the extent of c/3 technology in 1999.
• Archive of c/3 ships and puffers in Life - A collection of c/3 technology compiled by David Bell (last updated Dec. 20, 2002).
• ships collection - A collection compiled by Stephen Silver (mentioned above) containing the smallest known ships (in terms of minimum population) for small periods (last updated Jan. 12, 2004).
• Lots of spaceships - A collection of raw search output from gfind for low-period spaceships (includes a c/3 collection). The collection is unsorted and contains several duplicates.
• jslife collection - A collection of interesting life patterns compiled by Jason Summers. The collection contains some c/3 technology (under 'velocity-c3').
• Some new spaceships - A topic in the forums containing a number of new period-6 c/3 ships by Josh Ball (first post) and myself (several subsequent posts).

Here are a few other recent advances in c/3 technology:
A c/3 ship by Josh Ball that is (almost) entirely period-6:

Code: Select all

x = 26, y = 22
19bo$16bobobo$5b3o7b4o$5boo11bo$7bobbobbobobo3bo$4b3obo4bobobobboo3bo$
4bo3bobobo11bo$7boboobo9bobo$b3obboobo10bobobo$obbob3obo9b3o$3bo5bo9b
3o$3bo5bo9b3o$obbob3obo9b3o$b3obboobo10bobobo$7boboobo9bobo$4bo3bobobo
11bo$4b3obo4bobobobboo3bo$7bobbobbobobo3bo$5boo11bo$5b3o7b4o$16bobobo$
19bo!

A new puffer by Josh Ball (p78) and some rakes based on it by myself (p48, p78, and p84):

Code: Select all

x = 375, y = 222, rule = B3/S23
5b3o17b3o57b3o17b3o67b3o17b3o112b3o17b3o$8bo15bo63bo15bo73bo15bo118bo
15bo$8b3o11b3o63b3o11b3o73b3o11b3o118b3o11b3o$b2ob3obobo11bobob3ob2o
49b2ob3obobo11bobob3ob2o59b2ob3obobo11bobob3ob2o104b2ob3obobo11bobob3o
b2o$b2o3bo4bo9bo4bo3b2o49b2o3bo4bo9bo4bo3b2o59b2o3bo4bo9bo4bo3b2o104b
2o3bo4bo9bo4bo3b2o$o2bo6bo11bo6bo2bo47bo2bo6bo11bo6bo2bo57bo2bo6bo11bo
6bo2bo102bo2bo6bo11bo6bo2bo2$7b2obo11bob2o61b2obo11bob2o71b2obo11bob2o
116b2obo11bob2o$b2o4b2ob2o9b2ob2o4b2o49b2o4b2ob2o9b2ob2o4b2o59b2o4b2ob
2o9b2ob2o4b2o104b2o4b2ob2o9b2ob2o4b2o$b2ob2o6b2o5b2o6b2ob2o49b2ob2o6b
2o5b2o6b2ob2o59b2ob2o6b2o5b2o6b2ob2o104b2ob2o6b2o5b2o6b2ob2o$o3b2o6bo
7bo6b2o3bo47bo3b2o6bo7bo6b2o3bo57bo3b2o6bo7bo6b2o3bo102bo3b2o6bo7bo6b
2o3bo$4b2o7bo5bo7b2o55b2o7bo5bo7b2o65b2o7bo5bo7b2o110b2o7bo5bo7b2o$12b
o7bo71bo7bo81bo7bo126bo7bo2$12b2o5b2o71b2o5b2o81b2o5b2o126b2o5b2o$11bo
2bo3bo2bo69bo2bo3bo2bo79bo2bo3bo2bo124bo2bo3bo2bo$11bo9bo69bo9bo79bo9b
o124bo9bo$9bo13bo65bo13bo75bo13bo120bo13bo$9bo13bo65bo13bo75bo13bo120b
o13bo$11bob2o3b2obo69bob2o3b2obo79bob2o3b2obo124bob2o3b2obo$13b2o3b2o
73b2o3b2o83b2o3b2o128b2o3b2o$12bobo3bobo71bobo3bobo81bobo3bobo126bobo
3bobo$10b2o9b2o67b2o9b2o77b2o9b2o122b2o9b2o$11b3o5b3o69b3o5b3o79b3o5b
3o124b3o5b3o$11bo2b2ob2o2bo69bo2b2ob2o2bo79bo2b2ob2o2bo124bo2b2ob2o2bo
$13b2o3b2o73b2o3b2o83b2o3b2o128b2o3b2o$12bobo3bobo71bobo3bobo81bobo3bo
bo126bobo3bobo2$9bo2b2o5b2o2bo65bo2b2o5b2o2bo75bo2b2o5b2o2bo120bo2b2o
5b2o2bo$9b5o5b5o65b5o5b5o75b5o5b5o120b5o5b5o$9bo4b2ob2o4bo65bo4b2ob2o
4bo75bo4b2ob2o4bo120bo4b2ob2o4bo$9bo13bo65bo13bo75bo13bo120bo13bo$8b2o
5bobo5b2o63b2o5bobo5b2o73b2o5bobo5b2o118b2o5bobo5b2o$8b2obo9bob2o63b2o
bo9bob2o73b2obo9bob2o118b2obo9bob2o$10bo11bo67bo11bo77bo11bo122bo11bo$
10bo11bo67bo11bo77bo11bo122bo11bo$10b2o4bo4b2o67b2o9b2o77b2o9b2o122b2o
9b2o$11b2o7b2o$91bob7obo10bo68bob7obo113bo10bob7obo$11bo9bo72b5o13b2o
70b5o115b2o13b5o$12b9o74b3o10bo3bob2o69b3o33bo80b2obo3bo10b3o$104b3ob
3o2b2o2b2obo90bo7b4o5bo68bob2o2b2o2b3ob3o$95b3o5bo5b2o2bo3b2ob2o63b3o
23b2o5b2o3bo3bobo66b2ob2o3bo2b2o5bo5b3o19bo11b4o$95b3o6bo2bob2ob2o4b2o
2bo62b3o13b2o2b2o4bob2o2bo4bo3bo3bo64bo2b2o4b2ob2obo2bo6b3o12b2o4b3obo
8bobob2obo$107bo5bob2o80b3ob2o2b2ob2o2b3o5bo5bob2o71b2obo5bo9b3o12b2ob
2obob2obo3b3o2bo4b3o$94b2ob2o6b3obo4b2obobo64b2ob2o7bo8b2o2bo4bo2bo4bo
bo73bobob2o4bob3o21bo3bo4bo3bobob2o6bo3bo$94bo3bo4bo3bo11bo64bo3bo7bob
obob2o5b3o4b2o4bo75bo11bo3bo17bo4b3o4bob3o2b2o9b2o$79bo14bo3bo4bo2bobo
6bo3bo64bo3bo6b2obo8b5obo6bo77bo3bo6bobo2bo16b2o3b2ob2o7bo2bobo8b2o$
77b4o14bobo4b2o11bo69bobo8bobo3bo4b2o2bobo7bo80bo11b2o13b2o2b2obobo3bo
8bobob2o5bob2o$73b2ob2o3bo3bo10bo5b2ob2o2b3o74bo6b2obobo107b3o2b2ob2o
13b3ob2obo2bo4b3o2bobobob2o4b2obob2o$73b2o2bo5b4o15bo8b2o80b2obobob2o
103b2o8bo14b2ob2obobo2bobo2b4obo4bo11bo$72bo2bo7bo3bo15bo2bobo3b2obo6b
o60bo5bo4bobo98bo6bob2o3bobo2bo9b2o14bo6b2o5bo3b2ob2ob2obo$81bo2bobo
19bobob2ob2obo4bobob2o55bobo3bobo6bobo91b2obobo4bob2ob2obobo11bo2bo6bo
13bo3b4o3bo$82bo27b2obo3bo2bo4b2o55bobo3bobo8bo91b2o4bo2bo3bob2o19b2o
5b2o12bo10b2o$111bo2bobo3bo3bo2bo55bo5bo100bo2bo3bo3bobo2bo13b3o2b4o
20bo$75bo35bo3b2obo180bob2o3bo12bo7b2o$73b4o10bo2bo22bo3bo3b2o172b2o3b
o3bo20bo2bo$69b2ob2o3bo3bo6bobo10b2o9b2o2bobob3o172b3obobo2b2o14bo3b2o
b3o$69b2o2bo5b4o5b3o6bo2b3o16bobo63bo110bobo22bo3b2o3bo$68bo2bo7bo14b
2o2bobo2bo16bo63bobo110bo28b2o$77bo2bob2o3b4o3b2o2bob3o81bobo$78bo7b5o
4bobo3b2o82bo175b2o$84bo3b3o5b2o212bo13bo22b3o10bob3o$84b3o223bo12bobo
15b3o2b2o3bo5bob2o3b2ob2o$323bo2bo13bobob4o3b2o3bob2obo2bo2b2o$89b3obo
236bo10b2o3bob2o5bo3bo6bo2bo$89b2obo22bo209bob3o7b3o2bo3bo5bo2bo3bo10b
o$91b2o21b4o207b2o9b3o2b2o3bo7bob2ob2o6bo$70b2o37bo3bo3b2ob2o193bo19bo
4bobobobo4bo5bobob2o7b3o$67b2ob2o36b4o5bo2b2o192bo2bo7b2obo13bob2o2b5o
2bobo5bo3b2obob2o$64b4o2b2o4b2o29bo3bo7bo2bo191bo13b2o5bobob2o2bob2o3b
o4bo2bobob2o2bo3bo3bo$63bo4bo4b2ob2o30bobo2bo162b2o36bo3bo5bo13b3o14b
3o2b2ob3o$64b2o7b2o3bo33bo157bo5b2ob2o5b2o26bo13bo11bo12bo4b3o3bo2bo$
73b2o194b3o3bo3b2o4bob2o22bo2bo2bo7bo2bo2bo8bo13bo3b2o5bo$268bo3bo6b2o
3bo2b2o2b3o2b3obo9bob2o15b2obo$269bobobobobo5bo2bob3o3bob3ob2o8bo3b3o
9b3o3bo$275bobo3b4ob2o3b5o2bo3bo9bo2b3o9b2obo$101b3obo83bo85bobo3b2o3b
2o3b2o6bo2bo9b2o3b2o10b2o$100bo3bo83bobo86bo13bo3b3o2bob2o9b2o2b2o7bob
2o$100bo86bo3bo95bo3bo7b2obobo9bob3o7b3o3b2o$100bo3bo87bo104bo2bobob2o
10bo10bo3bo2bo$101bobo14b3o66b2o2b2o106bo2bo13bo4b3o8bobo$102bo3b3o12b
o66b4o106b3obob2o9bobo4bo10bo$111b2ob3o4b2obo175bo14bo2bo3bobo$111b2o
3b2obo2b3ob3o171bo14b2obo4bo$111b4o5bobo6bo56bo130bo$114bobo3b4obo2bo
56bobo$113bo2bo68bobo$111b2o2bo9bobo58bo$110b4o7bobo2bo142b2o$110bo3b
2o6bo140bo5b2ob2o5b2o$110bob6o144b3o3bo3b2o4bob2o$110b2o6b2o46b3o92bo
3bo6b2o3bo2b2o2b3o2b3obo$110b4ob2o2bo44b2o3bo92bobobobobo5bo2bob3o3bob
3ob2o$112b2ob3o3b3o4b3obo30bo3bo2bo97bobo3b4ob2o3b5o2bo3bo$99b2o16bo3b
2obo2bob2ob2o29bo6b2obo94bobo3b2o3b2o3b2o6bo2bo$99b3o15bo3bo2bo2b3obo
2bo31b3ob2ob2o95bo13bo3b3o2bob2o$99b3o17bobo6bo4bo29b3o3bob2o2bo104bo
3bo7b2obobo$98b3obo16bo3b3o2bo33b2o126bo2bobob2o$97b5o25b2o45bo117bo2b
o$100b2o17b2o3bo3bo37b3o4b2o5b2o8b2o99b3obob2o10bo$96b3o27b2o39b2o3b3o
5bo2b2o5b2o101bo14b2o$96bobo68b2o2b2o10b5o105bo13b2obo$96b2obo3b2o65b
3o7b3o4bo$98bo4b2o63bo2bo8bo4bobo$98bo2bobo66bo14b2o114bob2obo$99bobo
198bo5bo$193b3o105bo5bo$302b4ob3o$87b2o216bo3bo$87bobo216b2o$87bo88bob
o5bo121bo3bo$176b2o5bobo120bo3bo$75b2o100bo5bo122bo2bo$75bobo13b3o16b
3o70b2o121b3o$75bo11bob2o3bo14bo3b2obo$86b3o3b3o2b3o4b3o2b3o3b3o63b3o
134b3o$63b2o20bo3bo4b3obobo2bobob3o4bo3bo$63bobo20bo7bo4bo4bo4bo7bo$
63bo31b2o10b2o8$316bo$308bo6bobo$307bobo4bo3bo$307b2o5bo2b2o$312b2obob
2o$312bo4b3o$312b2o3bo2bo$315b2obo2bo18bo12b2o$316b2o3bo12bo3b3o10b2ob
ob2o$316b2o15b4o5b3o4bo4bo2b4o$315b2o2bo12bo3bo5b3o3b2o6bo4bo$316bo2bo
10b3obo5bo2b2o2b2o2bo7b3o$317b2o9bo2b2o2bob2o7b2o3bo$328bo3bobo3b2o7b
3obobo8bo$328b2o4bobob2obob2o2bobobob2o4b4ob2o$328bo2b2obo4bobo2bo4bob
2o2bo3bo2bob2o$332b2obob2o3bo3b2o2b3o4b3obobobo$330bo2bo12b4o7b2o$308b
3o21b2o12b3o4bobo2bo$350bobo10$282bo$282bobo$282b2o$329b3ob3o$326b4obo
4b2obo$322bo3b2o3b2obo3b3o$307bo13b4o5b2obo3bo3bo$306bobo11bo3bobo3bo
9bo$306bobo11bobobobo3bo$307bo13b3o4bobo$322bo2$314bo$313bobo$313bobo$
314bo2b2o$314bo2b3o$309b2o8bo$308bo2bo2bo2b3o$309b2o7bo$317bo$317bo$
313bo$313bobo$314bo5$321b2o2$319bo2bo$318bo3bo$318bo2b2o$307b2o9b2o35b
o$306bobo11bo2bo21bo7b4o5bo$307bo13b3o21b2o5b2o3bo3bobo$335b2o2b2o4bob
2o2bo4bo3bo3bo$331b3ob2o2b2ob2o2b3o5bo5bob2o$330bo8b2o2bo4bo2bo4bobo$
330bobobob2o5b3o4b2o4bo$329b2obo8b5obo6bo$330bobo3bo4b2o2bobo7bo$327b
2obobo$327b2obobob2o$328bobo$331bobo$333bo2$261bo$261bobo$261b2o9$306b
3o16b3o$302bob2o3bo14bo3b2obo$301b3o3b3o2b3o4b3o2b3o3b3o$300bo3bo4b3ob
obo2bobob3o4bo3bo$301bo7bo4bo4bo4bo7bo$310b2o10b2o!

A c/3 greyship with a steeper descending component found by Hartmut Holzwart:

Code: Select all

x = 200, y = 206, rule = B3/S23
58bo$56b2o$56b2o$58bo$56bo$55b3o$55bo$54b2o$56bo$55bobo$55bobo$55bo$
57bo15bo$55b2o15bobo$55b2o14b2o$57bo15bo$71b2o$32bo21b3o14b3o$30b2o23b
ob2o$30b2o24b2o13bobo$40bo18bo8bo2bo$31b3o5bobo7bo7bo10bo2bo$31b3o5bo
8bobo5bo10bo2b2o9bo$38bo2bo5b2o6b6o6b3o10bobo$28b3o7b3o2b2o3bo6bo2bo
12bo7b2o$28b3o5bo10b3o4bo2bo10bo12bo$36b7o2bo3bo3b6o5b2o3b2o8b2o$27bo
3b2ob2o11b2o3bo5b2obob3obo11b3o$28bo2bo3b10o4b11o4bo3bo$25b2o19bo32bob
o$25b2o2b32o2b2obo9bo2bo$24b2o2bo33b2o3bo8bo2bo$8bo13bo3bo2b35o3bo7bo
2b2o9bo$7bobo12bo40bo11b3o10bobo$6b2o13bo3b38o2bo13bo7b2o$9bo11b4o40bo
10bo12bo$5bo3bo14b43o5b2o3b2o8b2o$2bo2bo16bo43b2obob3obo11b3o$bobo2b4o
12b46o4bo3bo$o2bo83bobo$bobo2b4o12b47o2b2obo9bo2bo$2bo2bo12b2o2bo47b2o
3bo8bo2bo$5bo3bo7b3o3b49o3bo7bo2b2o9bo$9bo4b2o2b2o51bo11b3o10bobo$6b2o
4b4o2bo4b48o2bo13bo7b2o$7bobobo5b2o3bo50bo10bo12bo$8bo3b7o3b53o5b2o3b
2o8b2o$16bo2b3o52b2obob3obo11b3o$12bobo6bob53o4bo3bo$9bob2obo8bo71bobo
$8bob2o12b53o2b2obo9bo2bo$7b2ob2o66b2o3bo8bo2bo$8bob2o12b56o3bo7bo2b2o
9bo$9bob2obo8bo55bo11b3o10bobo$12bobo6bob56o2bo13bo7b2o$16bo2b3o59bo
10bo12bo$8bo3b7o3b61o5b2o3b2o8b2o$7bobobo5b2o3bo59b2obob3obo11b3o$6b2o
4b4o2bo4b61o4bo3bo$9bo4b2o2b2o83bobo$5bo3bo7b3o3b62o2b2obo9bo2bo$2bo2b
o12b2o2bo63b2o3bo8bo2bo$bobo2b4o12b66o3bo7bo2b2o9bo$o2bo83bo11b3o10bob
o$bobo2b4o12b65o2bo13bo7b2o$2bo2bo12b2o2bo66bo10bo12bo$5bo3bo7b3o3b68o
5b2o3b2o8b2o$9bo4b2o2b2o70b2obob3obo11b3o$6b2o4b4o2bo4b69o4bo3bo$7bobo
bo5b2o3bo88bobo$8bo3b7o3b71o2b2obo9bo2bo$16bo2b3o72b2o3bo8bo2bo$12bobo
6bob73o3bo7bo2b2o9bo$9bob2obo8bo71bo11b3o10bobo$8bob2o12b71o2bo13bo7b
2o$7b2ob2o85bo10bo12bo$8bob2o12b75o5b2o3b2o8b2o$9bob2obo8bo74b2obob3ob
o11b3o$12bobo6bob77o4bo3bo$16bo2b3o97bobo$8bo3b7o3b79o2b2obo9bo2bo$7bo
bobo5b2o3bo79b2o3bo8bo2bo$6b2o4b4o2bo4b81o3bo7bo2b2o9bo$9bo4b2o2b2o83b
o11b3o10bobo$5bo3bo7b3o3b80o2bo13bo7b2o$2bo2bo12b2o2bo82bo10bo12bo$bob
o2b4o12b85o5b2o3b2o8b2o$o2bo102b2obob3obo11b3o$bobo2b4o12b86o4bo3bo$2b
o2bo12b2o2bo104bobo$5bo3bo7b3o3b86o2b2obo9bo2bo$9bo4b2o2b2o90b2o3bo8bo
2bo$6b2o4b4o2bo4b89o3bo7bo2b2o9bo$7bobobo5b2o3bo88bo11b3o10bobo$8bo3b
7o3b89o2bo13bo7b2o$16bo2b3o91bo10bo12bo$12bobo6bob92o5b2o3b2o8b2o$9bob
2obo8bo90b2obob3obo11b3o$8bob2o12b92o4bo3bo$7b2ob2o123bobo$8bob2o12b
93o2b2obo9bo2bo$9bob2obo8bo94b2o3bo8bo2bo$12bobo6bob97o3bo7bo2b2o9bo$
16bo2b3o97bo11b3o10bobo$8bo3b7o3b97o2bo13bo7b2o$7bobobo5b2o3bo98bo10bo
12bo$6b2o4b4o2bo4b100o5b2o3b2o8b2o$9bo4b2o2b2o102b2obob3obo11b3o$5bo3b
o7b3o3b101o4bo3bo$2bo2bo12b2o2bo120bobo$bobo2b4o12b103o2b2obo9bo2bo$o
2bo122b2o3bo8bo2bo$bobo2b4o12b106o3bo7bo2b2o9bo$2bo2bo12b2o2bo104bo11b
3o10bobo$5bo3bo7b3o3b104o2bo13bo7b2o$9bo4b2o2b2o109bo10bo12bo$6b2o4b4o
2bo4b108o5b2o3b2o8b2o$7bobobo5b2o3bo107b2obob3obo11b3o$8bo3b7o3b110o4b
o3bo$16bo2b3o129bobo$12bobo6bob110o2b2obo9bo2bo$9bob2obo8bo110b2o3bo8b
o2bo$8bob2o12b112o3bo7bo2b2o9bo$7b2ob2o123bo11b3o10bobo$8bob2o12b111o
2bo13bo7b2o$9bob2obo8bo113bo10bo12bo$12bobo6bob116o5b2o3b2o8b2o$16bo2b
3o116b2obob3obo11b3o$8bo3b7o3b118o4bo3bo$7bobobo5b2o3bo136bobo$6b2o4b
4o2bo4b118o2b2obo9bo2bo$9bo4b2o2b2o122b2o3bo8bo2bo$5bo3bo7b3o3b121o3bo
7bo2b2o9bo$2bo2bo12b2o2bo120bo11b3o10bobo$bobo2b4o12b121o2bo13bo7b2o$o
2bo141bo10bo12bo$bobo2b4o12b125o5b2o3b2o8b2o$2bo2bo12b2o2bo123b2obob3o
bo11b3o$5bo3bo7b3o3b125o4bo3bo$9bo4b2o2b2o147bobo$6b2o4b4o2bo4b126o2b
2obo9bo2bo$7bobobo5b2o3bo127b2o3bo8bo2bo$8bo3b7o3b130o3bo7bo2b2o9bo$
16bo2b3o129bo11b3o10bobo$12bobo6bob128o2bo13bo7b2o$9bob2obo8bo129bo10b
o12bo$8bob2o12b131o5b2o3b2o8b2o$7b2ob2o142b2obob3obo11b3o$8bob2o12b
132o4bo3bo$9bob2obo8bo151bobo$12bobo6bob134o2b2obo9bo2bo$16bo2b3o136b
2o3bo8bo2bo$8bo3b7o3b138o3bo7bo2b2o9bo$7bobobo5b2o3bo136bo11b3o10bobo$
6b2o4b4o2bo4b136o2bo13bo7b2o$9bo4b2o2b2o141bo10bo12bo$5bo3bo7b3o3b140o
5b2o3b2o8b2o$2bo2bo12b2o2bo139b2obob3obo11b3o$bobo2b4o12b142o4bo3bo$o
2bo179bobo$bobo2b4o12b143o2b2obo9bo2bo$2bo2bo12b2o2bo143b2o3bo8bo2bo$
5bo3bo7b3o3b145o3bo7bo2b2o9bo$9bo4b2o2b2o147bo11b3o10bobo$6b2o4b4o2bo
4b144o2bo13bo7b2o$7bobobo5b2o3bo146bo10bo12bo$8bo3b7o3b149o5b2o3b2o8b
2o$16bo2b3o148b2obob3obo11b3o$12bobo6bob149o4bo3bo$9bob2obo8bo167bobo$
8bob2o12b149o2b2obo9bo2bo$7b2ob2o162b2o3bo8bo2bo$8bob2o12b152o3bo7bo2b
2o$9bob2obo8bo151bo11b3o$12bobo6bob152o2bo13bo$16bo2b3o155bo10bo$8bo3b
7o3b157o5b2o3b2o$7bobobo5b2o3bo155b2obob3obo$6b2o4b4o2bo4b157o4bo3bo$
9bo4b2o2b2o$5bo3bo7b3o3b158o2b2obo$2bo2bo12b2o2bo159b2o3bo$bobo2b4o12b
162o3bo$o2bo179bo7b3o$bobo2b4o12b161o2bo5b2o$2bo2bo16bo162bo7bo$5bo3bo
14b163o3b3o$9bo11b4o161b2obo$6b2o13bo3b163o3b2o$7bobo12bo168bobobo2b2o
$8bo13bo3bo2b160o6bo2bo$24b2o2bo162bo5bobo$25b2o2b161o$25b2o19bo16bo
16bo16bo16bo16bo16bo16bo23bo$28bo2bo3b10o4b13o4b13o4b13o4b13o4b13o4b
13o4b13o4b21obo$27bo3b2ob2o11b2o3bo11b2o3bo11b2o3bo11b2o3bo11b2o3bo11b
2o3bo11b2o3bo11b2o3bo13bo2b2o$36b7o2bo3bo3b7o2bo3bo3b7o2bo3bo3b7o2bo3b
o3b7o2bo3bo3b7o2bo3bo3b7o2bo3bo3b7o2bo3bo3b11o7bo$28b3o5bo10b3o4bo9b3o
4bo9b3o4bo9b3o4bo9b3o4bo9b3o4bo9b3o4bo9b3o4bo9b2obo3bobo$28b3o7b3o2b2o
3bo6b3o2b2o3bo6b3o2b2o3bo6b3o2b2o3bo6b3o2b2o3bo6b3o2b2o3bo6b3o2b2o3bo
6b3o2b2o3bo6b3o3b2o2bo$38bo2bo5b2o6bo2bo5b2o6bo2bo5b2o6bo2bo5b2o6bo2bo
5b2o6bo2bo5b2o6bo2bo5b2o6bo2bo5b2o6bo2bo2b2o2bo$31b3o5bo8bobo5bo8bobo
5bo8bobo5bo8bobo5bo8bobo5bo8bobo5bo8bobo5bo8bobo5bo$31b3o5bobo7bo6bobo
7bo6bobo7bo6bobo7bo6bobo7bo6bobo7bo6bobo7bo6bobo7bo6bobo$40bo16bo16bo
16bo16bo16bo16bo16bo16bo$30b2o$30b2o$32bo!

A period-159 engineless rake constructed by Jason Summers:

Code: Select all

x = 473, y = 780, rule = B3/S23
254boob3o26boo$254boo4boo19b3obob3o$253bobbobo3bo14booboo3bo3boo5bo$
260b3obb3o5boobobb3obo3bo3bo3boob3o$262b3obobo4boo5boboboobbooboo8bo$
262bo4bo4bobbo3bo5b5obob3o3boo$263boo12bob3obboobboo3b4o$277boo3boo13b
o$263boo17boo4bo5bobo$262bobbo12bo10bo4bo$262bobbo11bobo$261boobo8b3o
3bo10bo$262boboboo4bobobo5b3o4b4o8b3o$259boobobo7bobobo4bo3boobo3boo8b
obooboo$259boobobobo6bobo5bobobbobobo3bo4boobo4boo$260bobobobbo12boo4b
obobbo6bobobo3bobbo$261bobbo3boo4bo7boobbobob7obobobo$249bo10b5obb3o4b
o8bo4bo5bo5bo3bo$224boob3o18bobo10b3oboboo10b3obboobboo4bo6boo$224boo
4boo15bo3bo13bo12b4o4b3o7boobbo4bo$223bobbobo3bo15b3o14bo11bo3b3o11boo
3bo3boo$230b3obb3o44b3o10b3o$232b3obobo7boo3boo19bo4bobo3boo10boo4b3o$
232bo4bo8boo3boo18b3o$233boo10boob3obbo17boboo$243boo3bobooboo17b3o$
233boo7bo3bo25boo$232bobbo6bo4bo3bo$232bobbo9b3obbo$231boobo7b3o4bo$
232boboboo3boo$229boobobo$229boobobobo$230bobobobbo$231bobbo3boo$230b
5obb3o$231b3oboboo$219bo15bo$215b3ob3o13bo5bo$214bo6boo16boo$215boo3bo
bbo3bo11boobo$225b4o10boo3bo$225bo3bo10boo3bo$223bobbobo13b3o$224bo$$
224boo$223bobbo$223boboo$222boobobo43b3o$221bobobo45bobbo$220boobobob
oo42bo$223bobo45bo$220boobobobboo42bobo$225boo3bo$221bo4boo$221bo4bobo
bo$223bobbo17$259b3o$261bo10bo$260bo10b3o$270boobo$270b3o$271boo5$256b
oobo$253boobooboo$253bobbobobbo$247boo4boo5bo38boo$247booboo48boo$246b
o3boo47bo$250boo$259bo$222bo34b3ob3o$221boo33boo6bo$221bobo27bo3bobbo
3boo$250b4o$249bo3bo$250bobobbo$254bo$237boo$237boo100boo$338bobo$271b
3o66bo$270bobbo$226bo22bo23bo$222b3ob3o18b3ob3o19bo$181b3o37bo6boo16b
oo6bo15bobo$181bo40boo3bobbo3bo6bo3bobbo3boo$182bo49b4o4b4o$105boboo
19b3o101bo3bobbo3bo$104boobooboo16b3o99bobbobo4bobobbo$103bobbobobbo
15bo3bo99bo12bo$104bo5boo4boo$113booboo8bo5bo246bo$113boo3bo7boo3boo
246boo$113boo13bo4boo243bobo$123booboboboo$113boo8boobobobo3bo305boo$
113boo8b3ob4o309booboo$112bobbo7b3o3boo11boo295boboboo$112bobobo4boo5b
o12boo295b3obboo$112bobo28bo290b3obobob3o$109booboboboo3bobboo307bo11b
oo$109boobobo319bobobbo$112bobobobo324bobbo$111bobbo3bo315boo5bo$109b
3oboobboo314bobbo3boo$118bo299b3o16bo$111bobboo156bo147bo16bo3bo$95boo
b3o15bo154b3o145bo17bo3bo4bo$95boo4boo168boboo163boo5b4o$94bobbobo3bo
168b3o169bo3booboo$101b3obb3o163boo170bo3bobboo$103b3obobo332bo7bobbo$
103bo4bo333bo$104boo338boboo$446boo$104boo339bobo$103bobbo336boo$103bo
bbo337b3o$102boobo338bobboo3bo$103boboboo337boo3b3o$100boobobo339bobo
bbo3bo$100boobobobo339bobobobo$101bobobobbo338bo$102bobbo3boo336boo$
101b5obb3o4bo331bo11b3o$102b3oboboo5boo330bo10boboboo$106bo9boo341bo$
106bo10boobo343boboo$117bobbo340b5obboboo$118bobo22bo9bo301b3o4bobo5b
oo$142bobo4b3ob3o297boobo7boo3bobbo$141bo3bobbo6boo285boo8bo3b5ob4obo$
142b3o4boo3bobbo3bo279boboo8bobobbobobobo$159b4o108b3o165bo5boo9bobboo
boo$117bo22boo3boo12bo3bo107bobbo164bo3bobo$117boo21boo3boo10bobbobo
108bo167bo5boboo6boo$117b3o19bobb3oboo10bo112bo167bobo6bo$119bo18boob
oobo3boo122bobo164bobo6bo5b3o$121bo24bo3bo7boo280bobbooboo8bo$116boo3b
o19bo3bo4bo6bobbo284bo9bo$116boo24bobb3o9boobo271boo$120bo22bo4b3o5bob
oboo270bobo$116bobbo30boo6bobobo270boo$117b3o35booboboboo$158bobo272b
oo$154boobboboboo268bobo$153bo3boo273boo$156boo4bo282bo16b3oboo$153bob
obo4bo277bobbooboo12boo4boo$150bo6bobbo278bobo6bo10bo3bobobbo$151boo
286bobo6bo5b3obb3o$153bo261bo23bo5boboo4bobob3o$150bobbo259b4o22bo3bob
o8bo4bo$136bo10b5o260boo3bo21bo5boo10boo$134b3ob3o9bo260bo5b3o21boboo$
133boo6bo3bo3bo264bobo4boo19boo$128bo3bobbo3boo3bo266bob4o4boo$127b4o
13bobo263b8ob4o$126bo3bo14bo264boo$127bobobbo139bo142bo5boo$131bo139b
3o140bobo3bobbo$138b3oboo126boobo143bobobbo$136boo4boo126b3o142b4o$
135bo3bobobbo126boo142b4o$130b3obb3o279bobbo$129bobob3o$88bo41bo4bo$
87boo44boo$31bo55bobo$29b4o$28boo3bo$27bo5b3o$30bobo4boo$27bob4o4boo
373boo$26b8ob4o63boob3o20b3oboo275booboo$26boo74boo4boo16boo4boo272b4o
bbobo$31bo5boo62bobbobo3bo14bo3bobobbo270bo4bo4bo$30bobo3bobbo68b3obb
3o4b3obb3o278boo7bo$33bobobbo71b3obobobbobob3o54bo234bo$31b4o75bo4bo4b
o4bo53b4o228b3o$31b4o12b3o61boo10boo53bo3boo226bo$25b3o5bobbo10bo128b
3o5bo226boboo$21boboo3bo19bo83bo40boo4bobo233bo$20b3o3bobo99b3ob3o38b
oo4b4obo226boo$19bo3bo4boo97bo6boo37b4ob8o219b3obbo3bo$20bo7b3o97boo3b
obbo3bo43boo219b3o5bo$26bobo109b4o31boo5bo90b3o130bo3bobbo27bo$25boo
111bo3bo29bobbo3bobo88bobbo134bobbo23b3oboo$24bo3bo107bobbobo31bobbobo
94bo137boo21bo5b3o$28bo108bo39b4o92bo136b3o22boo7boo$25boboo96boob3o
46b4o89bobo138boo26bo4boo$20bo4bo99boo4boo42bobbo5b3o251bo4b3o$19bobo
3b3o96bobbobo3bo49bo3boobo246boo3boo5b3o5bo$18bo3bo108b3obb3o34boo8bob
o3b3o232boo9boobboobb3obbo6b3ob3o$19boobo3bo106b3obobo32bobo7boo4bo3bo
226b3obo11b3oboo6boo5boo6bo$24boo107bo4bo35bo6b3o7bo226b5obo11booboobb
oo3b4obobbo3boo$134boo47bobo231b4o4bo$12boo10bobbo157boo229boo7bo25bo$
10boboo10bobo156bo3bo228bo4bo3bo3bo21bobo$9boo3bo168bo233bo3bobbo4bobo
bboo$9boo172boobo235b3o4bo6bo$bbob4obboo174bo4bo238bo4bo$boob4o7boo
167b3o3bobo238bo3bo$obboboobbo5booboo115boob3o20b3oboo22bo3bo239bo$bo
7bo3boo3boo115boo4boo16boo4boo18bo3boboo$6boobboboo3b3o114bobbobo3bo
14bo3bobobbo18boo262bo$9boobo128b3obb3o4b3obb3o288boo$16boo125b3obobo
bbobob3o25bobbo10boo247boobo$143bo4bo4bo4bo26bobo10boobo247bobbo$17bo
126boo10boo39bo3boo237boob3o6boo$17bo183boo237boo3boobb3oboobb3o$16bob
o181boobb4obo230b4o5bo4b3obobo$16bo178boo7b4oboo61bo170bobobboo4bo4bo$
192booboo5bobboobobbo59b3o168bobbo9boo$192boo3boo3bo7bo60boboo165boobb
o$192b3o3boobobboo66b3o164b4o$34boo163boboo69boo165bo3boo$34bobo157boo
243bob6o$26bo7b3o402boo6boo$25boboo5boo158bo244b4oboobbo$6boboo15bo3bo
4bo4boo153bo246boob3o3b3o4b3obo$5boobooboo13boobo8bobo152bobo250bo3boo
bobbobooboo$4bobbobobbo15bo9boo155bo250bo3bobbobb3obobbo$5bo5boo4boo
429bobo6bo4bo$14booboo9bo9boo361bo46bo3b3obbo$14boo3bo6boobo8bobo15b3o
338b3ob3o52boo$14boo9bo3bo4bo4boo14bo3boo335bo6boo43boo3bo3bo$25boboo
5boo18bobbo3bo335boo3bobbo3bo45boo$26bo7b3o14boboo6bo345b4o$34bobo13b
ooboob3o348bo3bo$34boo13bobboobo3b3o140boobo199bobbobo$61boo136booboob
oo199bo$50bo148bobbobobbo$50boo4b3o134boo4boo5bo199boo$50b3o3boo135boo
boo207bobbo$52boobboo95b3o36bo3boo207boboo41boobo$52b3o96boo3bo39boo
206boobobo37boobooboo$53bobbo93bo3bobbo17bo227bobobo39bobbobobbo$54bo
95bo6boobo14bo226booboboboo30boo4boo5bo$153b3obooboo12b3o94b3o131bobo
33booboo$150b3o3boboobbo108bobbo127boobobobboo28bo3boo$149boo21bo5bo
92bo135boo3bo31boo$161bo8bo9bo90bo131bo4boo$153b3o4boo7boo4bo4boo90bob
o128bo4bobobo$154boo3b3o6boo4b3o4boo222bobbo$154boobboo9bobb3ob3obbo$
60bo96b3o10bobo5bobo$59b4o92bobbo$58bo3booboo90bo12bobo5bobo$58bo3bobb
oo102bobb3ob3obbo268b3o$56bo7bobbo100boo4b3o4boo269bo$56bo112boo4bo4b
oo269bo$58boboo108bo9bo$60boo110bo5bo$59bobo$57boo115b3o$58b3o90bo23bo
$58bobboo3bo82b4o22bo$60boo3b3o77booboo3bo269bo5boo$33bo25bobobbo3bo
76boobbo3bo270bo$32boboboo23bobobobo76bobbo7bo267b3o$31bo4boo23bo93bo
267bobb3o$28boboo3bobbo22boo87boobo$27booboobo27bo88boo275boo$26bobb6o
26bo88bobo$22boo9bobbo116boo117bo$11boob3o4boobo3bo3bo3bo114b3o117b3o$
11boo4boobboob3oboobbobboo108bo3boobbo116boobo$10bobbobo3boboo5boo3bo
bbo107b3o3boo118b3o$17b3o5boo5bo110bo3bobbobo25bo92boo$19b3obo120bobob
obo23boobobo$19boo129bo23boo4bo$149boo22bobbo3boobo$150bo27bobooboo$
150bo26b6obbo$55boo118bobbo9boo$42b3o9bobbo117bo3bo3bo3boboo4b3oboo$
55bobo117boobbobboob3oboobboo4boo$56bo118bobbo3boo5boobo3bobobbo$21b3o
155bo5boo5b3o$24bo15bo147bob3o$24boo12bobbo149boo$19b3obboobboobo5bo3b
oo$13boo4bo5boobooboo6bo$13booboo4boobo3boobbo4b3o$12bo3boo6b4o$16boo
8boobobo17bobo$29bo18bo$31boo15bo$29bobboo14bobbo136b3o$26boob3o16b3o
136bo$24b3o5bobbo150boo$23bo3bob4obo145boboobboobb3o78b3o$14bo6bo4boo
151boobooboo5bo4boo71bobbo$10b3oboo4boo4bo151bobboo3boboo4booboo74bo$
9bo5boobboobbo3bo156b4o6boo3bo73bo$10boo5bobbobobbo154boboboo8boo74bob
o$15bo4b3obo157bo$14bob3obb3o46b3oboo103boo$17b3o3boo43boo4boo79boo21b
oobbo$14bobbo49bo3bobobbo77bobbo22b3oboo$16bo45b3obb3o84bobo19bobbo5b
3o$61bobob3o87bo21bob4obo3bo$62bo4bo116boo4bo6bo$65boo118bo4boo4boob3o
$184bo3bobboobboo5bo$65boo119bobbobobbo5boo$64bobbo119bob3o4bo$10bo11b
o41bobbo68boob3o30boo14b3obb3obo$8b4o6b3ob3o40boboo67boo4boo34bo8boo3b
3o$4booboo3bo4bo6boo36boobobo67bobbobo3bo26bobbo3bo15bobbo$4boobbo3bo
5boo3bobbo3bo34boboboo71b3obb3o21boobo20bo$3bobbo7bo13b4o31boboboboo
73b3obobo22bo$14bo13bo3bo29bobbobobo74bo4bo$9boobo13bobbobo28boo3bobbo
76boo$9boo16bo32b3obb5o$9bobo49boobob3o76boo$12boo50bo79bobbo$10b3o51b
o79bobbo41bo11bo70bo$4bo3boobbo130boobo40b3ob3o6b4o67b3o$3b3o3boo133bo
boboo36boo6bo4bo3booboo63boboo$bbo3bobbobo129boobobo34bo3bobbo3boo5bo
3bobboo64b3o$3bobobobo131boobobobo31b4o13bo7bobbo63boo$9bo132bobobobbo
29bo3bo13bo$8boo5b3o125bobbo3boo28bobobbo13boboo$9bo5bo126b5obb3o32bo
16boo$9bo6bo126b3oboboo49bobo$147bo50boo$147bo51b3o$199bobboo3bo214boo
$201boo3b3o212b3o$162bobo35bobobbo3bo211boobo$161bo40bobobobo213b3o$
161bo40bo220bo$161bobbo37boo$161b3o38bo$202bo9$271b3o$271bobbo$271bo$
271bo$272bobo10$174bo11bo$172b4o9b4o$171boo3bo7bo3boo$168bobo4bo9bo4bo
bo$167boo3bo7bo7bo3boo$168bo3boo5b3o5boo3bo$170boboo4bo3bo4boobo$149bo
18boobbo6b3o6bobboo$147b4o21bo5b5o5bo$143booboo3bo3bo12bo3bobooboo3boo
boobo3bo$143boobbo5b4o13boo3bo9bo3boo$142bobbo7bo3bo16bobboo3boobbo$
151bobbobo115bo$152bo118b3o$270boobo$270b3o$144bo126boo$142b4o$138boob
oo3bo3bo$138boobbo5b4o$137bobbo7bo3bo$146bobbobo$147bo7$182bo$180b3ob
3o$179boo6bo$174bo3bobbo3boo$162bo10b4o$160bobbo8bo3bo$159bo4bo8bobobb
o$159bo4bo12bo$160bo$160bo3bo11boo$160boobbo10bobbo92b3o$162b3o10boobo
91bobbo$174boboboo93bo$156boobbo5bo9bobobo92bo$155b3obo5bobo5boobobob
oo88bobo$157boboo4bobbo7bobo$158bo7boo4boobboboboo$157b3obboo7bo3boo$
155bobo4bobo9boo4bo$155bo7bo7bobobo4bo$175bobbo11$49boo$49b3o$48boboo$
48b3o$49bo$128boboo140bo$127boobooboo136b3o$126bobbobobbo136boboo$127b
o5boo4boo131b3o$136booboo131boo$136boo3bo$136boo$123b3ob3o$119boboo4bo
b4o$118b3o3boboo3boo3bo$117bo3bo3boboo5b4o$118bo9bo3bobo3bo$128bo3bobo
bobo$128bobo4b3o$136bo6$129bo$127b4o$123booboo3bo$123boobbo3bo$122bobb
o7bo$133bo$128boobo$128boo141b3o$128bobo7boo131bobbo$131boo4boo132bo$
129b3o6bobo18boo110bo$127boobbo3bo4boo17boo111bobo$128boo5bo5bo$128bob
o4bo5bo$141bo$129boo$$130bo292bobo$130bo291bo$129bobo290bo$129bo292bo
bbo$422b3o$120bo$118b4o$114booboo3bo3bo$114boobbo5b4o38boo$113bobbo7bo
3bo37booboo$122bobbobo37bobobb4o$123bo40bo4bo4bo$164bo7boo$164bo$166b
3o$169bo$165boobo103bo$164bo106b3o$167boo101boobo$165bo3bobb3o95b3o$
166bo5b3o96boo$168bobbo3bo$168bobbo$167boo$167b3o$167boo18$271b3o$270b
obbo$273bo$159boo112bo$159boo109bobo22$272bo$271b3o$271boboo$272b3o$
272boo3$172bo$173boo$172boo12$47bobo$50bo$50bo93boob3o20b3oboo$47bobbo
93boo4boo16boo4boo$48b3o92bobbobo3bo14bo3bobobbo$150b3obb3o4b3obb3o$
152b3obobobbobob3o103b3o$152bo4bo4bo4bo103bobbo$153boo10boo104bo$271bo
$61boo9boo198bobo$58booboo9booboo$58boo3bo7bo3boo$54b3obbo15bobb3o$54b
oobb3o5b3o5b3obboo$54b3o9b3o9b3o$55bo9bo3bo9bo$36boo18bobbo15bobbo$33b
ooboo17booboo4bo5bo4booboo$30b4obboo4boo15b7obob7o$29bo4bo4booboo14bob
obo9bobobo$30boo7boo3bo$39boo4$31boo$28booboo$25b4obboo4boo$24bo4bo4b
ooboo$25boo7boo3bo359boo9boo$34boo360booboo9booboo$272bo123boo3bo7bo3b
oo$271b3o118b3obbo15bobb3o$270boobo118boobb3o5b3o5b3obboo$270b3o119b3o
9b3o9b3o$271boo120bo9bo3bo9bo$394bobbo15bobbo18boo$393booboo4bo5bo4boo
boo17booboo$69boobo324b7obob7o15boo4boobb4o$66boobooboo322bobobo9bobob
o7b3o4booboo4bo4bo$66bobbobobbo346bo3bobbo3boo7boo$60boo4boo5bo347bo3b
o6boo$60booboo356bo3bo$59bo3boo357b3o$63boo$440boo$63boo375booboo$63b
oo369boo4boobb4o$62bobbo368booboo4bo4bo$61bobobo367bo3boo7boo$63bobo
371boo$60booboboboo$63boboboo$59bobobobo$59bo3bobbo$51boo6boobboob3o$
50boboo5bo$50bobo9boobbo$50boo9bo209b3o126boboo$48bo221bobbo125booboob
oo$47b3o223bo124bobbobobbo$48boo223bo125bo5boo4boo$44b5o221bobo135boob
oo$45b3o360boo3bo$46bo361boo$$408boo$408boo$407bobbo$407bobobo$407bobo
$404booboboboo$404boobobo$407bobobobo$14boob3o386bobbo3bo$14boo4boo
382b3oboobboo$13bobbobo3bo390bo$20b3obb3o378bobboo$22b3obobo184bo197bo
$22bo4bo183bobo$11bo3bo7boo187boo$9b3oboobobo$5booboo6bobbo$5boobbobbo
3bobboobboo$4bobbo4bobbobbooboboo247bo$15boo4bo3bo245b3o$14boobbobbobo
bo245boboo150bo$16bo255b3o137bobo10bo$22b3o247boo139bo12bo$$420bo3boo$
422b3o6bo$422boo7boo$430boboo$16boo412bobo20b3oboo$13booboo412boo19boo
4boo$10b4obbobo431bo3bobobbo$9bo4bo4bo425b3obb3o$10boo7bo424bobob3o$
19bo425bo4bo$15b3o430boo7bo3bo$14bo439boboboob3o$15boboo434bobbo6boob
oo$19bo428boobboobbo3bobbobboo$15boo431booboboobbobbo4bobbo$14bo3bo
428bo3bo4boo$17bo429bobobobbobboo$15bo440bo$17bo430b3o$28bo$16boo6bobb
oo$23bobbo5bo13boo223b3o$16b3o4bo5boobbo12boo223bobbo$16bo6bobboo5bo
237bo$17bo6bo5bobbo237bo183boo$28boobbo239bobo180booboo$7boo19bo425bob
obb4o$4booboo444bo4bo4bo$b4obboo4boo438bo7boo$o4bo4booboo438bo$boo7boo
3bo439b3o$10boo446bo$454boobo$453bo$456boo$454bo3bo$455bo$457bo$455bo
$$455boo$$454b3o$456bo$455bo$439boo$438bobbo22boo$57boo213bo164bo3boo
21booboo$56bobo212b3o162boo3bo16boo4boobb4o$58bo211boobo163boboobobbo
12booboo4bo4bo$270b3o152boo13bobobbo11bo3boo7boo$271boo152boo12bo4boo
15boo$435booboo8bo$435b3o8boobobboo$435bobo9bobobboo$64bo371bo8bobbo$
62b3ob3o367bo8boo$61boo6bo$56bo3bobbo3boo$55b4o$54bo3bo38bo$55bobobbo
36boo$59bo36bobo$$58boo$57bobbo$57boobo$56boboboo$58bobobo$55boobobob
oo344bo$58bobo346boo$54boobboboboo343bobo$53bo3boo$56boo4bo$46boo5bobo
bo4bo73b3o132b3o$46boo9bobbo77bo131bobbo134bo$137bo135bo130b3ob3o$273b
o129bo6boo$32boboo22boobo208bobo131boo3bobbo3bo$31boobooboo16boobooboo
351b4o$30bobbobobbo16bobbobobbo350bo3bo$31bo5boo4boo4boo4boo5bo188bobo
158bobbobo$40booboo4booboo198boo159bo$40boo3bobbo3boo198bo114b3o$40boo
10boo313bo45boo$368bo43bobbo$412boboo$176boo233boobobo$177boo231bobobo
$176bo232booboboboo$412bobo$409boobobobboo$414boo3bo$410bo4boo$410bo4b
obobo$412bobbo$328boo$327boo$329bo81boboo22boobo$410boobooboo16booboob
oo$216boo54bo136bobbobobbo16bobbobobbo$215bobo53b3o136bo5boo4boo4boo4b
oo5bo$217bo53boboo144booboo4booboo$272b3o144boo3bobbo3boo$272boo145boo
10boo5$288boo$288bobo$288bo$$256bo$256boo$255bobo!

Note: there are known reactions that could potentially allow the construction of engineless rakes with periods as low as about 90, but, with current technology, such rakes would be very large.

Edit: Here's a period-6 spaceship by Josh Ball that I forgot to mention:

Code: Select all

x = 33, y = 113, rule = B3/S23
5b3o17b3o$8bo15bo$8b3o11b3o$b2ob3obobo11bobob3ob2o$b2o3bo4bo9bo4bo3b2o
$o2bo6bo11bo6bo2bo2$7b2obo11bob2o$b2o4b2ob2o9b2ob2o4b2o$b2ob2o6b2o5b2o
6b2ob2o$o3b2o6bo7bo6b2o3bo$4b2o7bo5bo7b2o$12bo7bo2$12b2o5b2o$11bo2bo3b
o2bo$11bo9bo$9bo13bo$9bo13bo$11bob2o3b2obo$13b2o3b2o$12bobo3bobo$10b2o
9b2o$11b3o5b3o$11bo2b2ob2o2bo$13b2o3b2o$12bobo3bobo2$9bo2b2o5b2o2bo$9b
5o5b5o$9bo4b2ob2o4bo$9bo13bo$8b2o5bobo5b2o$8b2obo9bob2o$10bo11bo$10bo
11bo$10b2o9b2o2$11bob7obo$14b5o$15b3o3$12b2o5b2o$9b2obo7bob2o$9b2obob
2ob2obob2o$9bobo2b2ob2o2bobo2$14b5o$14b5o2$13bo5bo$12b2o5b2o$12b2o2bo
2b2o$13bo5bo$13bo5bo$13bobobobo$12b2o5b2o$11bo2bo3bo2bo$11bob2o3b2obo$
10b2obo5bob2o$12bo7bo$12bo7bo$11bobo5bobo$11bo9bo$11b3o5b3o2$15b3o$15b
3o2$14bo3bo$13bo5bo$14b2ob2o$15bobo2$13bo5bo$12bobo3bobo$11b2o2bobo2b
2o$12bobo3bobo$10bob2o5b2obo$10b3o7b3o$10bo11bo$12b3o3b3o$11bo2bo3bo2b
o$12bobo3bobo$11bob2o3b2obo$13bo5bo$13bobobobo$13bobobobo$11bo3bobo3bo
$10bo4bobo4bo$9b2o11b2o$11bo9bo$11bo9bo$13b2o3b2o$13bo5bo$14bo3bo$12bo
7bo$11b2obo3bob2o$14b2ob2o$14b2ob2o2$11bo9bo$10b4o5b4o$10bobobo3bobobo
$9b2o3b2ob2o3b2o$10b4obobob4o$10b2o3bobo3b2o$15bobo$12bo3bo3bo$13bo5bo
$14bo3bo$16bo!