Pi ship 1

The pi ship is a growing spaceship which relies on the reappearance of the pi-heptomino 30 generations through its evolution. Mike Beeler showed in Lifeline Volume 4 that a pair of blocks suppresses the pi's self-destructive exhaust and allows the reincarnated pi to evolve again, nine cells further forward. These blocks can of course be laid down by a puffer, and that puffer is the front part of the pi ship.

Pi ship 1
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Pattern type Growing spaceship
Number of cells 452
Direction Orthogonal
Front period 18
Front speed c/2
Back period 30
Back speed 3c/10
Discovered by David Bell
Year of discovery Unknown
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