Period-7 sparkers

This is a list of known period-7 sparkers. While such sparkers can still be found with JLS and WLS, due to the relatively high period, such searches can take weeks or months to complete.

Dot sparkers and functional dot sparkers

x = 13, y = 11, rule = B3/S23 4bo3bo$o2bobobobo2bo$obo2bobo2bobo$bo2b2ob2o2bo$5bobo$2b2o5b2o$2bo7bo$ 4bo3bo2$bo2bo3bo2bo$2b2o5b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 38P7.2: This is typically the smallest option, but it is not very robust. (click above to open LifeViewer) RLE: here Plaintext: here	x = 14, y = 20, rule = B3/S23 5bo$5bo2$3bo3bo$b3obob3o$o4bo4bo$b4obobobo$4bobo4b2o$b2obo2bob2o2bo$b 2obo3bobob2o$5bo4bobo$10bo2bo$6bo4b3o$7b4o$11bo$3b2obobob2o$3bob2ob2o$ 7bo3b3o$7bob2o2bo$8bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] p7 pipsquirter: mainly functions as a dot, but also has rarer uses as a vertical domino. (click above to open LifeViewer)	[[:RLE:Pipsquirter2]] #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] An edgier form of the p7 pipsquirter. In most cases, the other form is more useful, but it depends on the dimensions. (click above to open LifeViewer) RLE: here Plaintext: here
x = 19, y = 10, rule = B3/S23 6bo6bo$5bo3b2o3bo$4bo3b4o3bo$bo2bobob4obobo$obobobo6bobob2o$bo2bob2o4b 2ob2obo$4bo4b2o$5b3obo$7bobo$8bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] p7 thumb: Being only 10 cells thick, it's useful for reducing bounding boxes. It's also useful if two sparks need to be close together; in addition to it naturally being a double sparker (spacing 8), the tub on the left can be replaced with a gutter (spacing 7), remain as a tub (spacing 11), or become a beehive (spacing 12), and a second copy can be added on the other side. (click above to open LifeViewer)	x = 25, y = 25, rule = B3/S23 8bo7bo$6bo3bo3bo3bo$5bo4bo3bo4bo$11bobo$7b3obobob3o$2bo4bo3bobo3bo4bo$ bo9bobo9bo$4b2o5bobo5b2o$o3bo6bobo6bo3bo$4bo5bo3bo5bo$b2o6bo5bo6b2o$3b 6o7b6o2$3b6o7b6o$b2o6bo5bo6b2o$4bo5bo3bo5bo$o3bo6bobo6bo3bo$4b2o5bobo 5b2o$bo9bobo9bo$2bo4bo3bobo3bo4bo$7b3obobob3o$11bobo$5bo4bo3bo4bo$6bo 3bo3bo3bo$8bo7bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 120P7: a relatively large middleweight sparker. (click above to open LifeViewer)	x = 41, y = 30, rule = B3/S23 33b2o$32bo2bo$32b2obo$35b3o$32b2o4bo$31bob4o$30bo5bo$30b6o4bo$28b2o5bo $27bo2b2o3b2o2bo$27bobo2b2o2b3o$26b2ob2obobobo$27bobo3b2o$23b2o2bo3b4o $22bo2bobo3b2o$22bob2obobo$21b2o4bobo$12b2o6bo2bobob2o$8b2obo2bo3bo2b 2o$6b3o3b2obo2b3o2b6o$5bo4b2o3bo6bo4b2o$5b5o2b3ob6obo$6bo4bo2bo8b2o$2o 3b2ob2obo3b2o3bo$o2bob2ob2o6bo3b2o$2b2obobo3bo$3bobob4obobobo$3bo2bo5b ob2obo$4bobo2b3o5bo$5bo3bo7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 168P7: large but nevertheless sometimes necessary. The original form of the period-49 glider gun used these sparkers. (click above to open LifeViewer)
x = 24, y = 23, rule = B3/S23 17b2o$17bo2bo2$21bo$18bo$10b2o6b2o$10bobo2b3o$12bo2b3o$12b2ob2o$3b2o5b 2o6bobo$4bo4bo2b3o3bob3o$3bo3bo2bobo3bobo4bo$2bob7o2b2obobob3o$2bobo6b obo3bo2bo$b2o3b3obo2bobobobo$2bob2obobo3b2obobo$o2bobobobo2b3obo$2obob obobob2o3bo$3bobo3bobobobo$3bo2b2obobob2o$2b2o4bobobo$8bo3bo$7b2o3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 121P7: smaller and edgier than 168P7 but not as robust. (click above to open LifeViewer)	x = 29, y = 19, rule = B3/S23 5b2o$6bo8b2o$5bo5b2o2bo2bo4bobo$5b2o4bobobob2o3bob2o$13bobo6bo$8b2o5bo b2o2b2ob4o$b3o11bobobo4bo3bo$6bob2o3bobobob2obo3bobo$5b2ob2o2bobob2o2b obob4o$o2bo4b2o7b3o$5b2ob2o2bobob2o2bobob4o$6bob2o3bobobob2obo3bobo$b 3o11bobobo4bo3bo$8b2o5bob2o2b2ob4o$13bobo6bo$5b2o4bobobob2o3bob2o$5bo 5b2o2bo2bo4bobo$6bo8b2o$5b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 138P7: can be used if the side middleweight sparks interfere. (click above to open LifeViewer)	x = 19, y = 15, rule = B3/S23 9bo$9bo$8b3o2$b2o3b2o3b2o3b2o$o2bo5bo5bo2bo$3o13b3o$3b3o7b3o$2o3b4ob4o 3b2o$ob2o3bo3bo3b2obo$2bo2bo2bobo2bo2bo$o2b2o2b2ob2o2b2o2bo$2obo11bob 2o$3bo11bo$3b2o9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] T-nosed p7: usually outclassed by the p7 pipsquirter. (click above to open LifeViewer) RLE: here Plaintext: here

Domino sparkers

Edgy domino sparks can sometimes be used as dots.

x = 18, y = 14, rule = B3/S23 8b2o$6bo4bo$2b2obo6bob2o$bob4o4b4obo$bobob8obobo$2obo2b6o2bob2o$o2bo 10bo2bo$2bo2bo6bo2bo$3b2o8b2o$5bo6bo$3b2o3b2o3b2o$3bo3bo2bo3bo$bobo4b 2o4bobo$b2o12b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 62P7: A small and highly robust sparker, which is usually the best option for a domino spark. (click above to open LifeViewer) RLE: here Plaintext: here	x = 111, y = 24, rule = B3/S23 14b2o2b2o$14bo3bo5bo11bo11b2o6b2o2b2o$11b2obobobo4bobo3b2o5b3o10bo5bob o2b2o3b2o35b2o$11bobobobo5bo2bobobo2bo5bo3b2ob3o6bo9bobo3b2o27b3o6b2o$ 8b2obo3bo6b2ob2obo4b6o3bobobo5b2ob9obobo3bo5b2o15b2o3bo4bo5bo$7bobob2o 2b2o3bo4bo3b4o6b4obo7bobo8b2obob2obo4bobo12b2o2bo4bob2obob3o$9bo9b2ob 2o3b2o3bob5o4bobo8bob2o2b2o4bobobob2o2bo13bo2b2o6bobobobo$8bob3o7bobob 3o2b2o3b3obo2bob2obob2o2bobobo2b3o4bo3bo3bobo4bo8b2obo8b2ob2o$6bobo2bo 2b5obobobo2bo12bobo6bo4bobob3o2b2o3bobo2bo2bobobo5bo4bobo8b3o$bob3obo 4bo6bo2b2o2b2obob2ob2o2bob2ob2obo2b2o5b3o8b4obobob2o3bo3bobobobob2o7b 3o3bo$5b3o4bo4bob2o2bo2b2obob2ob2o3b2o2bo6bobob2o4bobo8b2o2bobo4b2o2b 2o3b2o2bo6b3o2bobo$o7b2o5bobobo2bo5b4o3b2o3bo14bob2ob3o3bo4b2o3bo16bo 2bo5b3o2bobo$o7b2o5bobobo2bo5b4o3b2o3bo14bob2ob3o3bo4b2o3bo16bo2bo5b3o 3bo$5b3o4bo4bob2o2bo2b2obob2ob2o3b2o2bo6bobob2o4bobo8b2o2bobo4b2o2b2o 3b2o2bo6b3o$bob3obo4bo6bo2b2o2b2obob2ob2o2bob2ob2obo2b2o5b3o8b4obobob 2o3bo3bobobobob2o7b2ob2o$6bobo2bo2b5obobobo2bo12bobo6bo4bobob3o2b2o3bo bo2bo2bobobo5bo4bobo7bobobobo$8bob3o7bobob3o2b2o3b3obo2bob2obob2o2bobo bo2b3o4bo3bo3bobo4bo8b2obo6bob2obob3o$9bo9b2ob2o3b2o3bob5o4bobo8bob2o 2b2o4bobobob2o2bo13bo2b2o4bo4bo5bo$7bobob2o2b2o3bo4bo3b4o6b4obo7bobo8b 2obob2obo4bobo12b2o2bo4b3o6b2o$8b2obo3bo6b2ob2obo4b6o3bobobo5b2ob9obob o3bo5b2o15b2o6b2o$11bobobobo5bo2bobobo2bo5bo3b2ob3o6bo9bobo3b2o$11b2ob obobo4bobo3b2o5b3o10bo5bobo2b2o3b2o$14bo3bo5bo11bo11b2o6b2o2b2o$14b2o 2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 678P7: Sometimes 62P7 is too wide, so the very large 678P7 is needed instead. There are also a few rare uses where regions destroy 62P7 but not 678P7. (click above to open LifeViewer) RLE: here Plaintext: here	x = 16, y = 16, rule = B3/S23 11bo$10bobo$10bobo$9b2obob2o$12b2obo$8bob2o$11bo$8b3o$5bobo$3bo3bob2o$ b3obobob2o$o4b2o$b4o$4bo$3bo$3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 44P7.2: produces a small, edgy, delayed domino. It usually doesn't work, but if it does, it should be used. (click above to open LifeViewer) RLE: here Plaintext: here
x = 13, y = 9, rule = B3/S23 2b2o9b$2bo10b$7bo5b$6obo5b$o12b$b2ob2o3b2o2b$2bobo4bobob$2bobo6bob$3bo 7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 28P7.1: The spark is weak enough that it usually can't be used to sustain something else; instead, it gets used more as part of a phase-changing mechanism (7n+1). Oscillators that phase change in this way typically work just as well without the 28P7.1. (click above to open LifeViewer) RLE: here Plaintext: here	x = 22, y = 14, rule = B3/S23 10b2o$8b6o$7b8o$6bo8bo$5b2o8b2o$3b3ob8ob3o$2bob2o2b6o2b2obo$b2ob2o4b2o 4b2ob2o$2bo2b2o8b2o2bo$o2bobo10bobo2bo$2obobobo6bobobob2o$3bo2b2o6b2o 2bo$2obo14bob2o$obo16bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 60P7, found by Josh Ball. If the active region doesn't recede by generation 3, it will be destroyed. The main advantage of this over 62P7 is that the sides don't stick as far out in front, meaning it often fits in places where 62P7 doesn't. Despite the spark not being isolated, this doesn't make it any less useful. (click above to open LifeViewer)	x = 18, y = 25, rule = B3/S23 4bo3b2o3bo$3bobobo2bobobo$3bobo6bobo$b3obo6bob3o$o4bob4obo4bo$b3obob4o bob3o$3bo2b2o2b2o2bo$6bo4bo$7bo2bo$8b2o$3bo10bo$b3o10b3o$o5b6o5bo$b3o 10b3o$3bo10bo$8b2o$7bo2bo$6bo4bo$3bo2b2o2b2o2bo$b3obob4obob3o$o4bob4o bo4bo$b3obo6bob3o$3bobo6bobo$3bobobo2bobobo$4bo3b2o3bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 132P7: If the active region doesn't recede by generation 4, it will be destroyed. (click above to open LifeViewer) RLE: here Plaintext: here
x = 24, y = 18, rule = B3/S23 4b2o3bo4bo3b2o$bo2bo2bo2bo2bo2bo2bo2bo$obobob2obo4bob2obobobo$bo2bo2bo bob2obobo2bo2bo$4b2o3b2o2b2o3b2o$8bo6bo$7bo8bo$6bo10bo$7b2o6b2o2$3b2o 2b2o6b2o2b2o$3bo2bo10bo2bo$4bobo3bo2bo3bobo$3b2obobob4obobob2o$7b2o6b 2o$9b2o2b2o$9bo2bobo$10b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] Hebdarole: This sparker is more historically significant than useful, as it has been outclassed by the newer sparkers in the section. (click above to open LifeViewer) RLE: here Plaintext: here

Other sparkers

As these sparkers have unique sparks, they have specialized uses.

x = 10, y = 13, rule = B3/S23 obo$2obo$3bo2b2o$2obobobo$o2bo2bo$2bo$4bo$2b3o2$6b2o$6bobo$8bo$8b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 28P7.3: Used in the period-21 glider gun. (click above to open LifeViewer) RLE: here Plaintext: here	x = 12, y = 10, rule = B3/S23 4b2o$2o3bo$bo3bobo$bob2obobob2o$2bobobob2obo$4bo$2bo5b3o$o9bo$o3b4obo$ bo5b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 37P7.1, used in the smallest period-126 glider gun (click above to open LifeViewer) RLE: here Plaintext: here	x = 13, y = 14, rule = B3/S23 9b2o$9bo$10bo$9b2o$8bo$9b2o$8bo2bo$3bob5o2bo$b3obo4b2o$o4bobobo$b4o4bo $5b4o$3bo2bo$3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] 41P7.2, duoplet sparker (click above to open LifeViewer) RLE: here Plaintext: here
x = 42, y = 17, rule = B3/S23 4b2obobobo$4bob2ob2obo3b2o$8bo3bo3bo4b2o$5b2o3b2ob2obo5bo5b2o3bobo$5bo b3obobobo4bo4bo2bobobob2o$7bo11bob5o4bobo$7b2o3bo6bobo4b4obob5o$6b2ob 2o3bo3b2o3b2obo4bo4bobo$bo3bo6b2o3bo3bobo2b2o2bobobo3bo2bo$o2bobob2o3b o4b5obo3bo2bobobo2bob3o$obobobobo4bo3bo3bobo3bobobobo4bo$2bobobobob5ob ob4obobobobobobobo3bo$obob2obob2o4b2obo3bobobo3b2obob4o$2o5bo4b2o5bo2b o2bo8bo$7bob2obo7bobo13bo$8bobobo8bo13b2o$11bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]] Banana sparker custom-designed for the p49 skewed pulsar hassler. (click above to open LifeViewer)

See also

• Period-28 glider gun, which uses an even larger p7 sparker than 678P7
• 34P14 shuttle, which is smaller than almost all of the above and is a good alternative as long as the mechanism works at period 14
• p21 honey farm hassler, which is a pipsquirter that is a good alternative as long as the mechanism works at period 21
• Period-8 sparkers, a similar list