Glider loop

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Glider loop
x = 73, y = 150, rule = B3/S23 45bo$37b3o5bo$36bo2b2o3bobo$35bo5bo3bo$41bo3bo$36b2o2bo$25b2o11b2o$25b 2o6$61bo$17b2o40b2ob2o$17b2o42bo3$59b2o$58bo2bo$51bo5bo3b2o$51bo5bo4bo $9b2o40bo6bo3bo$9b2o37bob3obo3bo2bo$48b5obo5bo$48bobo$52b2o17bo$52b2o 9b3o5bo$52bo9bo2b2o3bobo$51b2o8bo5bo3bo$46b2o3bo15bo3bo$17b3o31bo10b2o 2bo$20bo29b2obo10b2o$15b2o4bo30bo$18bo3bo$14bo4bo2bo$14bo3bo3bo$14b3ob ob2o$18bo$14b4o7b3o$14b2o8bo3bo$24bo4bo28bo$26bo3bo25b2o9b2o$23b3obo2b o24b2o8b3obo$22bo7bo23bo10bo3bo$22bobo3bo26b5o5bob2o$21b2obo3bo27bo10b o$21b2ob3o5$63b2o$63b2o4$43b3o$46bo$41b2o4bo$44bo3bo6b2o$40bo4bo2bo6b 2o$40bo3bo3bo$40b3obob2o$44bo$40b4o$40b2o2$47b2o$47b2o2$33bo$33bobo$ 33b2o3$38b2o$37bobo$39bo2$24b2o$24b2o2$31b2o$29b4o$28bo$25b2obob3o$24b o3bo3bo$16b2o6bo2bo4bo$16b2o6bo3bo$25bo4b2o$26bo$27b3o4$8b2o$8b2o5$46b 3ob2o$5bo10bo27bo3bob2o$4b2obo5b5o26bo3bobo$3bo3bo10bo23bo7bo$3bob3o8b 2o24bo2bob3o$4b2o9b2o25bo3bo$14bo28bo4bo$44bo3bo8b2o$45b3o7b4o$54bo$ 51b2obob3o$50bo3bo3bo$50bo2bo4bo$50bo3bo$20bo30bo4b2o$7b2o10bob2o29bo$ 6bo2b2o10bo31b3o$bo3bo15bo3b2o$bo3bo5bo8b2o$obo3b2o2bo9bo$bo5b3o9b2o$b o17b2o$22bobo$12bo5bob5o$11bo2bo3bob3obo37b2o$10bo3bo6bo40b2o$10bo4bo 5bo$10b2o3bo5bo$11bo2bo$12b2o3$11bo42b2o$9b2ob2o40b2o$11bo6$46b2o$33b 2o11b2o$32bo2b2o$27bo3bo$27bo3bo5bo$26bobo3b2o2bo$27bo5b3o$27bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Pattern type Miscellaneous
Number of cells 456
Bounding box 73×150
Discovered by Unknown
Year of discovery Unknown

Glider loop (or simply loop) is a pattern in which two gliders are bounced back and forth between two ever-retreating 7-engine Corderships. This same glider-bouncing reaction can be seen in sawtooth 362.[1]

As gmc_nxtman pointed out in January 2018, a 2-engine Cordership can reflect a glider 180 degrees while preserving its mod-4 timing,[2] giving an updated version of glider loop:

x = 67, y = 128, rule = B3/S23 12bo$12bo5b3o$11bobo3b2o2bo$12bo3bo5bo$12bo3bo$17bo2b2o$18b2o11b2o$31b 2o7$b3o35b2o$b3o21bo13b2o$2bo12b2o9b2o$3b2o9bob3o8b2o$4bo9bo3bo10bo$3b o11b2obo5b5o$16bo10bo3$b2o$b2o$2bo$2bo$bobo$o$bo2b2o$2bo3bo$4b2o$4bo7$ 6b2o$6b2o$19bo$19b3o$20b2o$20bo$21bo$18b3obo$17bobob2o$18bobo31$46bobo $44b2obobo$44bob3o$45bo$46bo$45b2o$45b3o$47bo$59b2o$59b2o7$62bo$61b2o$ 60bo3bo$61b2o2bo$66bo$63bobo$64bo$64bo$64b2o$64b2o3$39bo10bo$38b5o5bob 2o11bo$37bo10bo3bo9bo$38b2o8b3obo9b2o$39b2o9b2o12bo$26b2o13bo21b3o$26b 2o35b3o7$34b2o$34b2o11b2o$45b2o2bo$50bo3bo$44bo5bo3bo$45bo2b2o3bobo$ 46b3o5bo$54bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]
Glider loop with 2-engine Corderships (click above to open LifeViewer)
RLE: here Plaintext: here

Videos

Several rounds of the gliders looping back and forth

References

  1. Alan Hensel's lifep.zip pattern collection.
  2. gmc_nxtman (January 3, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums