Replicators: B0235/S0

B0235/S0 has a diagonal replicator that repeats with period 4, moving diagonally at speed c/2.

B0235/S0 2c/4 diagonal replicator

The same rule also has a small 7c/14 orthogonal replicator:

B0235/S0 7c/14 orthogonal replicator

The orthogonal replicator can pull a dot behind it at 14c/28, making the largest known spaceship with only three live cells in any rule:

B0235/S0 14c/28 spaceship

Replicators -- Cellular Automata -- D. Eppstein -- UCI Inf. & Comp. Sci.