Heavyweight spaceship
| Heavyweight spaceship | |||||||||
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| Pattern type | Spaceship | ||||||||
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| Family | XWSS | ||||||||
| Number of cells | 13 | ||||||||
| Bounding box | 7 × 4 | ||||||||
| Frequency class | 15.7 | ||||||||
| Direction | Orthogonal | ||||||||
| Period | 4 (mod: 2) | ||||||||
| Speed | c/2 | 2c/4 | ||||||||
| Heat | 19 | ||||||||
| Kinetic symmetry | n-c | ||||||||
| Discovered by | John Conway | ||||||||
| Year of discovery | 1970 | ||||||||
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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.
Construction
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.[1] Later, a head-on 3-glider collision producing a clean HWSS was found by Dave Buckingham.[2]
A number of different known ways to construct a heavyweight spaceship can be found in Mark Niemiec's glider synthesis database.[3]
There are four-object one-glider seeds for the HWSS, consisting of a loaf, a beehive and two blocks.[4][5] There are also three 1G seeds for the heavyweight spaceship in the octo3obj database.[6]
| 3G synthesis for the HWSS (click above to open LifeViewer) |
Occurrence
- See also: List of natural spaceships
The HWSS is the thirty-fifth most common object on Adam P. Goucher's Catagolue.[7]
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.
There are 26 results in the octohash database, 322 results in the octo3obj database,[note 1] and 30 three-glider collisions in the octo3g database with at least one escaping HWSS.
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.
| 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.
| Two HWSSes escorting an otherwise unstable object, creating spaceship 51P20H10V0 (click above to open LifeViewer) RLE: here Plaintext: here Catagolue: here |
| Two HWSSes escorting an otherwise unstable object, creating spaceship 51P20H10V0.1 (Very long Coe ship between two HWSS[note 2]) (click above to open LifeViewer) RLE: here Plaintext: here Catagolue: here |
Gallery
Three heavyweight spaceship eaters. The second one is honey bit and the third killer toads
Notes
- ↑ There are two collisions (headerless RLEs are 10b3o$6b3obo$11bo$2o$2o7bo$9bo$9bo! and 10b3o$6b3obo$11bo$2o$2o$8b3o!), both converging to the same sequence, with two escaping heavyweight spaceships. The final population is 425.
- ↑ according to Mark Niemiec: https://conwaylife.com/ref/mniemiec/flotilla.htm#ss-3c
See also
- Fake xWSS
- Lightweight spaceship, Middleweight spaceship
- LWSS on HWSS 1, MWSS on HWSS 1, HWSS on HWSS 1
- Overweight spaceship
- Heavyweight emulator
- Ellison p4 HW emulator
- Ellison p4 HW emulator hybrid
- Heavyweight volcano
References
- ↑ Robert Wainwright (June 1973). Lifeline, vol 10, page 5.
- ↑ Robert Wainwright (September 1973). Lifeline, vol 11, page 18,19.
- ↑ The 1 thirteen-bit spaceship at Mark D. Niemiec's Life Page (download pattern file: ss/13hw.rle)
- ↑ Extrementhusiast (June 24, 2013). Re: Blockic Seeds (discussion thread) at the ConwayLife.com forums
- ↑ knightlife (June 28, 2013). Re: Blockic Seeds (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (October 21, 2022). Re: Octohash fingerprints (discussion thread) at the ConwayLife.com forums
- ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
External links
- HWSS at the Life Lexicon
- Heavyweight spaceship at Adam P. Goucher's Catagolue
- 13P4H2V0.1 at Heinrich Koenig's Game of Life Object Catalogs
- Patterns
- Patterns with Catagolue frequency class 15
- Natural periodic objects
- Spaceships with 13 cells
- Periodic objects with minimum population 13
- 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 unsimplified speed 2c/4
- Spaceships with heat 19
- XWSS variants
- Spaceships with mod 2
- Spaceships with n-c symmetry
- Polyominoes