Heavyweight spaceship

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Heavyweight spaceship
3b2o$bo4bo$o$o5bo$6o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ Y 1.5 TRACKLOOP 4 -1/2 0 THUMBSIZE 2 GPS 4 ]]
Pattern type Spaceship
Family XWSS
Number of cells 13
Bounding box 7×4
Frequency class 15.7
Direction Orthogonal
Period 4
Mod 2
Speed c/2
Speed (unsimplified) 2c/4
Heat 19
Discovered by John Conway
Year of discovery 1970

The heavyweight spaceship (commonly abbreviated to HWSS) or (rarely) big fish is the fourth most common spaceship after the glider, lightweight spaceship and middleweight spaceship. It was found by John Conway in 1970 and travels at a speed of c/2 orthogonally. Its domino spark can be used to stabilize several tagalongs, including sidecar and half of x66. It is one of only three known spaceships that is a polyomino in any of its phases.

Interactions with other objects

The side and tail sparks allow an HWSS to make changes to other objects without being affected itself -- a "Heisenburp" effect. For example, gliders approaching from behind can be deleted in five different ways, or can be converted into a block, B-heptomino, or beehive, that can be reanimated to make catch and throw technologies, as shown below.

x = 90, y = 38, rule = B3/S23 7b3o18bo$6bo2bo17b3o$9bo16b2obo17b3o$5bo3bo16b3o18bo2bo$5bo3bo16b3o18b o19b3o18bo$b2o6bo11b2o3b3o12b2o4bo3bo9b2o4bo2bo10b2o4b3o$obo3bobo11bob o4b2o11bobo4bo3bo8bobo4bo12bobo3b2obo$2bo19bo19bo4bo14bo4bo3bo10bo3b3o $48bobo16bo3bo14b3o$67bo18b3o$68bobo16b2o20$27b3o$27bo2bo17bo19bo$27bo 19b3o17b3o$27bo3bo15bob2o15b2obo$27bo3bo16b3o15b3o$21b2o4bo13b2o5b3o 10b2o3b3o$20bobo5bobo9bobo5b3o9bobo3b3o$22bo19bo5b2o12bo4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 WIDTH 1200 HEIGHT 600 ZOOM 12 GPS 5 ]]
first row: the five ways to delete a forward glider with an HWSS
second row: three HWSS Heisenburp reactions with a forward glider
(click above to open LifeViewer)
RLE: here Plaintext: here

Two HWSSes can escort XWSS-like objects that would otherwise be unstable, forming a c/2 spaceship. Two similar examples are shown below.

x = 10, y = 18, rule = B3/S23 6b2o$4bo4bo$3bo$3bo5bo$3b6o4$b2o$2ob7o$b8o$2b6o2$6b2o$4bo4bo$3bo$3bo5b o$3b6o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 5 TRACKLOOP 20 -1/2 0 THUMBSIZE 3 WIDTH 800 HEIGHT 560 ]]
Two HWSSes escorting an otherwise unstable
object, creating spaceship 51P20H10V0
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere
x = 10, y = 17, rule = B3/S23 6b2o$4bo4bo$3bo$3bo5bo$3b6o4$b2o$2ob7o$b9o$2b8o$6b2o$4bo4bo$3bo$3bo5bo $3b6o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 5 TRACKLOOP 20 -1/2 0 THUMBSIZE 3 WIDTH 800 HEIGHT 560 ]]
Two HWSSes escorting an otherwise unstable
object, creating spaceship 51P20H10V0.1
(Very long Coe ship between two HWSS[notes 1])
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere

Commonness

The HWSS is the thirty-fifth most common object on Adam P. Goucher's Catagolue.[1]

It is the fourth most common natural spaceship, being less common than the middleweight spaceship but about 355,000 times more common than MWSS on MWSS 1.

Glider synthesis

In 1973, Douglas G. Petrie made the first 8-glider synthesis for a heavyweight spaceship, involving a 3-glider ship, a 2-glider eater 1, and three other gliders from different directions in the final step.[2] Later, a head-on 3-glider collision was found by Dave Buckingham that produce a clean spaceship.[3]

Gallery

Three Heavyweight spaceship eaters.
The second one is honey bit and the third killer toads.

Notes

References

  1. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
  2. Robert Wainwright (June 1973). Lifeline, vol 10, page 5.
  3. Robert Wainwright (September 1973). Lifeline, vol 11, page 18,19.

See also

External links

  • 13P4H2V0.1 at Heinrich Koenig's Game of Life Object Catalogs