Pipsquirter 2

Pipsquirter 2 is a period-7 pipsquirter discovered by Noam Elkies in August, 1999.[1] Because of its easily-accessible domino spark, it is useful in the construction of larger patterns such as the p49 glider shuttle, the first known period 49 oscillator.

Pipsquirter 2
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Pattern type Oscillator
Number of cells 89
Bounding box 13×22
Period 7
Mod 7
Heat 15.4
Volatility 0.34
Strict volatility 0.34
Discovered by Noam Elkies
Year of discovery 1999

As a reflector

Pipsquirter 2 is most useful because of its ability to act as a 90-degree glider reflector (see p7 bouncer) when it is combined with a block, boat and eater 1. It takes 9 generations to recover from the impact, and the input path (in green) and output path (in red) of the glider are shown below. This reaction is the basis of the p49 glider shuttle and the bricklayer.

Pipsquirter 2 acting as a reflector
RLE: here

A version of the pipsquirter stator with slightly higher clearance is shown in the p7 bouncer article. The following larger period-7 pipsquirter reflector is used in cases where space is limited where the reflector should extend southward for as short a distance as possible.

A different version led to a period 56 gun due to its thin size.

<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 76, y = 56, rule = B3/S23 74bo$73bo$73b3o5$67bo$66bo$66b3o14$11b2o$10b2o$12bo3$46bo$45bo$18b2o 25b3o$17b2o$5b2o12bo$6b3o$4bo4bo$2b6obo29bo$bo5bob2o4b2o21bo$bob2obo4b o2bobo21b3o$2bo3bob2obo2bo$4bobo2bob2obo$3b2o3bo5b2o$2bo2b2obob4o2bo3b 2o$o2bo3bobo3bobo3bobo$2obo3bo2b2obo2b4o2b2o$bobob2obobobobobo3b2o2bo$ o2b3o2bo5bo4bo2bobo$obo3bob2o3b2o4bob2ob2o9b2o$bob4o2bo2bobo4bo5bo5b2o 2b2o$3bo3bo6b2o3bo2b4o4bobo$3bob2o2bo2bobo4bo5bo5bo$4bobob2o3b2o4bob2o b2o$6bobo5bo4bo2bobo8b2o$6bobo3bobobo3b2o2bo8bo$7bo3bobo2b4o2b2o10b3o$ 11bobobo3bobo14bo$12b2ob2o3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 X -16 Y 12 Z 10 GPS 14 HEIGHT 480 AUTOSTART LOOP 112 ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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RLE: here Plaintext: here
original (slightly bigger) pipsquirter
RLE: here
thin pipsquirter
RLE: here
gun based on two variants of pipsquirter 2
RLE: here
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See also

References
  1. "reflector". The Life Lexicon. Stephen Silver.
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