Period-117 glider gun

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Period-117 glider gun
x = 42, y = 29, rule = B3/S23 7bo7b2o10bob2o4b2obo$7b3o5b2o10b2o2bo2bo2b2o$10bo14b2o3bo4bo3b2o$9b2o 13bo3b2ob4ob2o3bo$25b3obobo2bobob3o$12bo14bobobo2bobobo$11bobo16bo4bo$ 10bo3bo16b4o$10bo3bo$10bo3bo$11bobo$12bo2$5b2o$5b2o28b2o$35b2o2$29bo$ 28bobo$27bo3bo$27bo3bo$7b4o16bo3bo$6bo4bo16bobo$3bobobo2bobobo14bo$b3o bobo2bobob3o$o3b2ob4ob2o3bo13b2o$b2o3bo4bo3b2o14bo$3b2o2bo2bo2b2o10b2o 5b3o$3bob2o4b2obo10b2o7bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 2 HEIGHT 400 GPS 40 ZOOM 8 LOOP 1170 ]]
Pattern type Gun
Number of cells 154
Bounding box 42×29
Period 117
Barrels 2
Discovered by David Raucci
Year of discovery 2021

Period-117 glider gun is a true period 117 gun discovered by David Raucci on July 6, 2021.[1] The gun uses a reaction similar to AK-94 where a honey farm hitting a fishhook produces a glider, but unlike AK-94, the period-117 gun uses two interacting copies instead of being a shuttle. The gun was initially found using 48P9s as sparkers, and then reduced with regard to bounding box by Tanner Jacobi using 66P13s,[2] and then by Matthias Merzenich using 50P9s the same day. [3] It is the smallest known odd-period gun by bounding box; its bounding box is 42×29=1218 cells, beating the previous record of 55×34=1870 cells for the period-33 glider gun.[4]

Image gallery

x = 47, y = 39, rule = B3/S23 36b2o$35bo2bo$35bobo$35bo9b2o$35bo2bo6bo$35bo2bo4bobo$35bob3o3b2o$39b 2o$12bo7b2o17b3o$12b3o5b2o17b2o$15bo19bob3o3b2o$14b2o19bo2bo4bobo$35b o2bo6bo$17bo17bo9b2o$16bobo16bobo$15bo3bo15bo2bo$15bo3bo16b2o$15bo3bo $16bobo$17bo2$10b2o$5bo4b2o28b2o$3b5o32b2o$2bo5bo$2bo2b3o26bo$b2obo28b obo$o3bob2o24bo3bo$bobo7b4o17bo3bo$2ob5o2bo4bo16bo3bo$9bo6bo16bobo$2o b5o2bo4bo18bo$bobo7b4o4b2o$o3bob2o11bobo14b2o$b2obo16bo14bo$2bo2b3o13b 2o7b2o5b3o$2bo5bo21b2o7bo$3b5o$5bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 13 THUMBSIZE 2 ]]
the two earlier stabilizations (click above to open LifeViewer)

References

  1. David Raucci (July 6, 2021). Re: Gun discussion thread (discussion thread) at the ConwayLife.com forums
  2. Tanner Jacobi (July 6, 2021). Re: Gun discussion thread (discussion thread) at the ConwayLife.com forums
  3. Matthias Merzenich (July 6, 2021). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  4. https://catagolue.hatsya.com/textcensus/b3s23/synthesis-costs/gun