Difference between revisions of "Prepulsar spaceship"
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apgcode = xq30_yq232x232zug1hmgc865da808ad568cgmh1guybug1hmgc865da808ad568cgmh1guz124w6yb6w421yb124w6yb6w421  apgcode = xq30_yq232x232zug1hmgc865da808ad568cgmh1guybug1hmgc865da808ad568cgmh1guz124w6yb6w421yb124w6yb6w421  
pentadecathlonid = 128P30H6V0.1  pentadecathlonid = 128P30H6V0.1  
−  viewerconfig = #C [[ GPS 5 ZOOM 7 TRACKLOOP  +  viewerconfig = #C [[ GPS 5 ZOOM 7 TRACKLOOP 30 0 1/5 ]] 
}}  }}  
'''Prepulsar spaceship''' (or '''PPS''' for short) is any of three different {{periodS30}} [[c/5 orthogonal]] [[spaceship]]s in which a [[prepulsar]] is pushed by a pair of [[spider]]s. The back [[spark]]s of these spaceships can be used to perturb [[glider]]s in many different ways, allowing the easy construction of c/5 [[puffer]]s.  '''Prepulsar spaceship''' (or '''PPS''' for short) is any of three different {{periodS30}} [[c/5 orthogonal]] [[spaceship]]s in which a [[prepulsar]] is pushed by a pair of [[spider]]s. The back [[spark]]s of these spaceships can be used to perturb [[glider]]s in many different ways, allowing the easy construction of c/5 [[puffer]]s. 
Revision as of 22:05, 14 July 2019
Prepulsar 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  
 
 
 

Prepulsar spaceship (or PPS for short) is any of three different period 30 c/5 orthogonal spaceships in which a prepulsar 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.
The first prepulsar spaceship, the symmetric prepulsar spaceship (or SPPS for short, shown to the right) was found by David Bell in May 1998 and was based on the p15 prepulsar spaceship found by Noam Elkies in December 1997.
The asymmetric prepulsar spaceship (or APPS, shown below) was found by Alan Hensel, also in May 1998, based on a skewed version of the prepulsar.
The glide symmetric prepulsar spaceship (or GPPS, shown below) was also found by David Bell in May 1998. It is similar to the symmetric prepulsar spaceship but contains an extra Ttetromino between the spiders and is glide symmetric.
Martin Grant's 601glider spider synthesis resulted in a 1212glider synthesis for the symmetric prepulsar spaceship on March 8, 2019.^{[1]}
In June 1998, David Bell found reactions to convert between the symmetric and glidesymmetric forms of the p30 prepulsar spaceship.^{[citation needed]}
Image gallery
References
 ↑ Adam P. Goucher. Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
External links
 Prepulsar spaceship at the Life Lexicon
 Asymmetric prepulsar spaceship at Adam P. Goucher's Catagolue (extended)
 128P30H6V0.1 at Heinrich Koenig's Game of Life Object Catalogs
 Patterns
 Patterns with 128 cells
 Patterns found by David Bell
 Patterns found in 1998
 Patterns that can be constructed with 101 or more gliders
 Spaceships
 Periodic objects with minimum population 128
 Spaceships with period 30
 Orthogonal spaceships
 Spaceships with speed c/5
 Spaceships with unsimplified speed 6c/30
 Spaceships with heat 131
 Spaceships with mod 30
 Pages needing attention
 Patterns with bilateral orthogonal symmetry
 Patterns found by Alan Hensel
 Nonmonotonic spaceships