Period-40 glider gun

Period-40 glider gun
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View static image
Pattern type	Gun
Number of cells	2416
Bounding box	226 × 220
Period	40
Barrels	1
Discovered by	Adam P. Goucher Matthias Merzenich Jason Summers
Year of discovery	2013
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3/S23 – B3/S234c
Pattern files RLE period40glidergun.rle

Period-40 glider gun is an extensible true period-40 glider gun discovered by Adam P. Goucher in 2013 and improved by Matthias Merzenich. It is based on a glider-releasing wick found by Jason Summers and Matthias Merzenich. It can be made to have more than 1 barrel.

A chain of honey farm precursors is hassled by figure eights and period-5 oscillators to produce 11 streams of gliders. One stream is the output, 4 are reflected to stabilize the ends of the honey farm chain, and the other 6 are absorbed by eater 1s.

A smaller version of the gun with a 165×136 bounding box was found by Luka Okanishi in April 2018.

The unrelated mechanism of using a blocker to filter the output of the period-20 glider gun yields a much smaller true period-40 gun, so this wick-based gun is of interest mainly for historical reasons.

On October 3, 2022, cvojan found a small engine for a new p40 glider gun design with a bounding box of 26 × 25. iNoMed reduced this to 27 × 20 - the fourth smallest of any known glider gun with a unique period as of December 2022. The only smaller guns known are of periods 30, 24 (found less than 12 hours prior despite otherwise being completely unrelated), 48, and 25.

Gallery

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x = 27, y = 20, rule = B3/S23 2b2o16b2o$b3o15bob3o$obo2bo2b2o9bo4bo$2o2b2o2b2o8b2ob3o$4b2o11bo3bo$ 17bo$17bo4bo$11b2o4bo3bo$11bobo4b2obobo$11bobo5bobob2o$12b2o5bobobo2bo $20bo3b3o$21b3o$24bo$23b2o$4b2o11b2o$3bobo11bobo$3bo7bo7bo$2b2o8b2o5b 2o$11b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] 27 × 20 period-40 glider gun (click above to open LifeViewer) RLE: here Plaintext: here