B29
B29  
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Pattern type  Tagalong Spaceship  

Number of cells  29  
Bounding box  10 × 17  
Direction  Diagonal  
Period  4  
Mod  4  
Speed  c/4  
Speed (unsimplified)  c/4  
Heat  30  
Discovered by  Hartmut Holzwart  
Year of discovery  2004  
 
 
 

B29 is a c/4 diagonal spaceship discovered by Hartmut Holzwart in September 2004.^{[1]} In generation 2 it produces an isolated domino spark that can be used to perturb reactions. In terms of its 29 cells, it is the fourth smallest c/4 diagonal spaceship, as well as the smallest c/4 spaceship to not exhibit glide symmetry.
Two gliders can be seen at the front of the ship, one of these being temporary and the other permanent, making this a tagalong. The other glider does not stay as a glider but still moves like one.
Glider synthesis
B29 is one of relatively few elementary diagonal spaceships with a known glider synthesis, due to a synthesis completed by Tanner Jacobi in April 2015.^{[2]}^{[3]}^{[4]}
Augmentations
There are three ways in which a glider can nontrivially follow a B29. All three such spaceships have been synthesized, with two of them having a glider cost lower than their minimum population.
Three ways in which gliders can nontrivially follow a B29 (click above to open LifeViewer) RLE: here Plaintext: here 
In addition, there are two ways to attach Wainwright's tagalong to the back of a B29 to create two distinct 36cell spaceships. Neither of these appear to have been synthesized so far.
Two ways in which Wainwright's tagalong can be supported by B29 (click above to open LifeViewer) RLE: here Plaintext: here 
See also
References
 ↑ "B29". The Life Lexicon. Stephen Silver.
 ↑ Tanner Jacobi (April 5, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
 ↑ Matthias Merzenich (June 12, 2015). Re: 4 glider syntheses (discussion thread) at the ConwayLife.com forums
 ↑ Matthias Merzenich (January 22, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
External links
 B29 at the Life Lexicon
 B29 at Adam P. Goucher's Catagolue
 29P4H1V1.1 at Heinrich Koenig's Game of Life Object Catalogs
 Patterns
 Spaceships with 29 cells
 Periodic objects with minimum population 29
 Patterns with 29 cells
 Patterns found by Hartmut Holzwart
 Patterns found in 2004
 Patterns that can be constructed with 25 gliders
 Spaceships
 Tagalongs
 Spaceships with period 4
 Diagonal spaceships
 Spaceships with speed c/4
 Spaceships with unsimplified speed c/4
 Spaceships with heat 30
 Spaceships with mod 4