A '''gunstar''' is any of a series of four-[[barrel]]led glider [[gun]]s of period 144 + 72n (n ≥ 0) that were constructed by [[David Buckingham]] in {{year|1990}} based on his [[transparent block reaction]] and [[Robert Wainwright]]'s period-72 [[oscillator]] [[two blockers hassling R-pentomino]]. Two copies of the oscillator together with a [[blocker]] and two [[eater 1]]s can duplicate a [[glider]]. One output glider emerges in the same direction as the original; the other is turned 90 degrees. By putting together 4 such reflectors, a 4-barrelled gun can be constructed.
A '''gunstar''' is any of a series of four-[[barrel]]led glider [[gun]]s of period 144 + 72n (n ≥ 0) that were constructed by [[David Buckingham]] in {{year|1990}} based on his [[transparent block reaction]] and [[Robert Wainwright]]'s period-72 [[oscillator]] [[two blockers hassling R-pentomino]]. Two copies of the oscillator together with a [[blocker]] and two [[eater 1]]s can duplicate a [[glider]]. One output glider emerges in the same direction as the original; the other is turned 90 degrees. A 4-barrelled gun can be constructed by putting together 4 such reflectors.
The version to the right is the "first" such gun, with a period of 144. The next such gun, with a period of 216, is shown below.<ref>[[Alan Hensel]]'s [http://www.ibiblio.org/lifepatterns/ lifep.zip pattern collection].</ref>
The version to the right is the "first" such gun, with a period of 144. The next such gun, with a period of 216, is shown below.<ref>[[Alan Hensel]]'s [http://www.ibiblio.org/lifepatterns/ lifep.zip pattern collection].</ref>
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==External links==
==External links==
{{LinkLexicon|lex_g.htm#gunstar}}
*{{LinkLexicon|lex_g.htm#gunstar}}
{{LinkCallahan|patterns/bhept/bhept.html|patternname=Buckingham on B-heptominos in oscillators}}
*{{LinkCallahan|patterns/bhept/bhept.html|patternname=Buckingham on B-heptominos in oscillators}}
