Overweight spaceship

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Overweight spaceship
x = 8, y = 5, rule = B3/S23 3b3o$bo5bo$o$o6bo$7o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 24 HEIGHT 500 GPS 4 TRACKLOOP 8 -1/2 0 ]]
Pattern type Miscellaneous
Number of cells 15
Bounding box 8 × 5
Discovered by John Conway
Year of discovery 1970

An overweight spaceship (or OWSS for short) is a would-be spaceship similar to the lightweight spaceship, middleweight spaceship and heavyweight spaceship, but longer. On its own an overweight spaceship is unstable. While the latter two xWSSes produce belly sparks that would die off, an overweight spaceship produces an egg that does not vanish but interferes with the body.

Naming

As there are an infinite number of overweight spaceships, it becomes neccessary to distinguish between sizes. This is often done by assigning each overweight spaceship a number corresponding to the length of its "line" section in its less dense phase. As such, the smallest overweight spaceship is referred to as the "7WSS".

In this naming system, "4WSS", "5WSS" and "6WSS" would correspond to the lightweight, middleweight and heavyweight spaceships (although using such terminology is never recommended), and "3WSS" to an underweight spaceship (roteightor segment).

The length of a spaceship's belly "spark" can be seen to be this value minus four; a 7WSS's belly "spark" is three cells in length.

As a spaceship component

An overweight spaceship can be escorted by true spaceships to form a flotilla. There are several possibilities for escorting one overweight spaceship via two standard spaceships.

For an OWSS with a top "spark" length over 4, the minimal escort size difference is 4, as shown below. It is also possible to stabilize an OWSS with more OWSSes, which then have to be stabilized by more xWSSes. Some sufficiently large extensions like this can be seen as a stabilisation of a period-4, one-dimensional agar, similar to a greyship (although ultimately lacking the 50% density requirement to be truly classified as one).[1]

x = 8, y = 16, rule = B3/S23 4o$o3bo$o$bo2bo$5bo$bo5bo$o$o6bo$7o4$4o$o3bo$o$bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 10 GPS 12 ]]
7WSS with escorts
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere
x = 9, y = 16, rule = B3/S23 2b4o$2bo3bo$2bo$3bo2bo2$bo6bo$o$o7bo$8o4$2b4o$2bo3bo$2bo$3bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 10 GPS 12 ]]
8WSS with escorts
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere
x = 40, y = 17, rule = B3/S23 18b3o$17bo2bo$12b3o5bo3b3o$12bo2bo4bo3bo2bo$6b3o3bo7bo3bo5b3o$5bo2bo3b o7bo3bo4bo2bo$3o5bo3bo7bo3bo7bo3b3o$o2bo4bo3bo7bo3bo7bo3bo2bo$o7bo3bo 7bo3bo7bo3bo$o7bo3bo7bo3bo7bo3bo$bobo4bo3bo7bo3bo7bo4bobo$8bo3bo7bo3bo 7bo$5bobo4bo7bo3bo4bobo$12bo7bo3bo$13bobo4bo4bobo$20bo$17bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 10 GPS 12 ]]
Overweight spaceship supported by more overweight spaceships
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere

Glider synthesis

Many lengths of overweight spaceship can be constructed by means of glider synthesis.[2] Recent syntheses are collected in the xq4 synthesis listed in Catagolue;[3] a number of older recipes can be found in Mark Niemiec's synthesis database.[4]

In other rules

The non-totalistic rule FattyLife (B3-n4nt5qr6i/S23)[5][6] is specifically tailored to support the overweight spaceship with spark length 3, making it a p8 spaceship (xq8_27deeee6).

References

  1. https://conwaylife.com/forums/viewtopic.php?f=7&t=2036&p=141393#p141393
  2. Martin Grant (June 5, 2019). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  3. Adam P. Goucher. "synthesis-costs/xq4 census". Catagolue.
  4. Overweight spaceship flotillae at Mark D. Niemiec's Life Page
  5. B3-n4nt5qr6i/S23 (FattyLife) (discussion thread) at the ConwayLife.com forums
  6. FattyLife (discussion thread) at the ConwayLife.com forums

External links