Pre-pulsar spaceship

Pre-pulsar spaceship (or PPS for short) is any of three different period-30 c/5 orthogonal spaceships in which a pre-pulsar is pushed by a pair of spiders. The back sparks of these spaceships can be used to perturb gliders in many different ways, allowing the easy construction of c/5 puffers.

Pre-pulsar spaceship
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Pattern type Spaceship
Number of cells 128
Bounding box 73×14
Direction Orthogonal
Period 30
Mod 30
Speed c/5
Speed (unsimplified) 6c/30
Heat 131.5
Discovered by David Bell
Year of discovery 1998

The first pre-pulsar spaceship, the symmetric pre-pulsar spaceship (or SPPS for short, shown to the right) was found by David Bell in May 1998 and was based on the p15 pre-pulsar spaceship found by Noam Elkies in December 1997.

The asymmetric pre-pulsar spaceship (or APPS, shown below) was found by Alan Hensel, also in May 1998, based on a skewed version of the pre-pulsar.

The glide symmetric pre-pulsar spaceship (or GPPS, shown below) was also found by David Bell in May 1998. It is similar to the symmetric pre-pulsar spaceship but contains an extra T-tetromino between the spiders and is glide symmetric.

Martin Grant's 601-glider spider synthesis resulted in a 1212-glider synthesis for the symmetric pre-pulsar spaceship on March 8, 2019.[1]

In June 1998, David Bell found reactions to convert between the symmetric and glide-symmetric forms of the p30 pre-pulsar spaceship.[citation needed]

The asymmetric pre-pulsar spaceship.
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The glide symmetric pre-pulsar spaceship.
Download RLE: click here
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gollark: Sure.

References
  1. Adam P. Goucher (March 8, 2019). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  • 128P30H6V0.1 at Heinrich Koenig's Game of Life Object Catalogs
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