Difference between revisions of "Speed Demonoid"
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Below the 2c/9 upper limit, the Speed Demonoid can be adjusted to move at any rational speed, by moving the trailing TRIGGER1 and TRIGGER2 gliders to the correct locations. | Below the 2c/9 upper limit, the Speed Demonoid can be adjusted to move at any rational speed, by moving the trailing TRIGGER1 and TRIGGER2 gliders to the correct locations. | ||
On September 26, a new Speed Demonoid variant was constructed to be smoother to simulate in [[HashLife]], and to improve on the 2c/9 upper speed limit mentioned above.<ref name="post104931" /> Speed Demonoid v2 can be trivially adjusted to move at any speed that is a rational fraction lower than c/4. | On September 26, a new Speed Demonoid variant was constructed to be smoother to simulate in [[HashLife]], and to improve on the 2c/9 upper speed limit mentioned above.<ref name="post104931" /> Speed Demonoid v2 can be trivially adjusted to move at any speed that is a rational fraction lower than c/4. A [[Golly]] 3.x/4.0 script is available that will set up a glider recipe to construct a Speed Demonoid for any chosen speed, within certain practical size limitations.<ref name="post108786" /> | ||
== Details == | == Details == | ||
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|author = Pavel Grankovskiy | |author = Pavel Grankovskiy | ||
|date = September 26, 2020 | |date = September 26, 2020 | ||
}}</ref> | |||
<ref name="post108786">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Speed Demonoid | |||
|p = 108786 | |||
|author = Dave Greene | |||
|date = November 1, 2020 | |||
}}</ref> | }}</ref> | ||
</references> | </references> | ||
Revision as of 01:23, 2 November 2020
| Speed Demonoid | |||||||
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| View static image | |||||||
| Pattern type | Spaceship | ||||||
|---|---|---|---|---|---|---|---|
| Number of cells | 1021124 | ||||||
| Bounding box | 872867 × 1839173 | ||||||
| Direction | Diagonal | ||||||
| Period | 17833792 | ||||||
| Mod | 8916896 | ||||||
| Speed | 1746011c/8916896 | 3492022c/17833792 | ||||||
| Heat | Unknown | ||||||
| Discovered by | Pavel Grankovskiy Dave Greene | ||||||
| Year of discovery | 2020 | ||||||
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This article is a stub. You can help LifeWiki by expanding it. |
Speed Demonoid is a self-constructing adjustable spaceship constructed by Pavel Grankovskiy with the help of Dave Greene and completed on September 18, 2020.[1]
Due to a limitation in the design, this initial version of the Speed Demonoid design has an upper limit speed of 2c/9 diagonally, rather than the theoretical maximum of c/4. A redesign of the circuitry was required to correct this limitation.
Below the 2c/9 upper limit, the Speed Demonoid can be adjusted to move at any rational speed, by moving the trailing TRIGGER1 and TRIGGER2 gliders to the correct locations.
On September 26, a new Speed Demonoid variant was constructed to be smoother to simulate in HashLife, and to improve on the 2c/9 upper speed limit mentioned above.[2] Speed Demonoid v2 can be trivially adjusted to move at any speed that is a rational fraction lower than c/4. A Golly 3.x/4.0 script is available that will set up a glider recipe to construct a Speed Demonoid for any chosen speed, within certain practical size limitations.[3]
Details
The Speed Demonoid achieves its speed by building a crab spaceship and turning it into a double wickstretcher. The two wicks are ignited at different times specified by the locations of the TRIGGER1 and TRIGGER2 gliders. With the help of "guard gliders" traveling near the crab spaceship, when the burning wicks reach the crab, they produce target objects at the right location to allow the next copy of the construction-arm and reflector circuitry to be constructed.
Both TRIGGER1 and TRIGGER2 are precisely synchronized so that they exactly keep up with the recipe gliders, despite being on different lanes and using one-time turners to move instead of conventional reflectors. Besides igniting the second crabstretcher wick, the TRIGGER2 signal also triggers self-destruct circuitry associated with the Scorbie Splitter and Snark.
The bait still lifes in the self-destruct circuitry were found by Simon Ekström's GoL-destroy search program. A similar design was used in the 10hd and 0hd Demonoids, but has been seen very rarely since then. Other recent Demonoids have used "destruction arms" similar to the one in the original Gemini spaceship, which incrementally shoot down parent constructor circuitry once it is no longer in use.
References
- ↑ Pavel Grankovskiy (September 18, 2020). Re: Speed Demonoid (completed) (discussion thread) at the ConwayLife.com forums
- ↑ Pavel Grankovskiy (September 26, 2020). Re: Speed Demonoid (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (November 1, 2020). Re: Speed Demonoid (discussion thread) at the ConwayLife.com forums
- Patterns
- Spaceships with between 1,000,000 and 9,999,999 cells
- Periodic objects with minimum population between 1,000,000 and 9,999,999
- Patterns with between 1,000,000 and 9,999,999 cells
- Patterns found by Pavel Grankovskiy
- Patterns found by Dave Greene
- Patterns found in 2020
- Outer-totalistically endemic patterns
- Spaceships
- Spaceships with period 17833792
- Diagonal spaceships
- Spaceships with speed 1746011c/8916896
- Spaceships with unsimplified speed 3492022c/17833792
- Spaceships with mod 8916896
- Glide symmetric spaceships
- Non-monotonic spaceships