Difference between revisions of "Heavyweight spaceship"
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Latest revision as of 18:42, 1 September 2018
Heavyweight Spaceship  
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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  
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.
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, Bheptomino, or beehive, as shown below.
Commonness
The HWSS is the thirtyfifth most common object on Adam P. Goucher's Catagolue.^{[1]}
It is the fourth most common natural spaceship that is not a flotilla, being less common than the middleweight spaceship but about 171,000,000 times more common than the Coe ship.
Image gallery
References
 ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
See also
External links
 Heavyweight spaceship at the Life Lexicon
 Heavyweight spaceship at Adam P. Goucher's Catagolue
 The 1 thirteenbit spaceship at Mark D. Niemiec's Life Page
 13P4H2V0.1 at Heinrich Koenig's Game of Life Object Catalogs
 Patterns
 Patterns with Catagolue frequency class 15.7
 Patterns with 13 cells
 Patterns found by John Conway
 Patterns found in 1970
 Patterns that can be constructed with 3 gliders
 Spaceships
 Spaceships with period 4
 Orthogonal spaceships
 Spaceships with speed c/2
 Spaceships with heat 19
 XWSS variants
 Spaceships with mod 2
 Glide symmetric spaceships
 Domino sparkers