Definition:

A pull and push ships are spaceships. They are pattern that must results from a collision of a spaceship (X) with a constellation of still lifes/oscillators (Y). After some generations the pattern recover a state before the collision but shifted along the travel line of the spaceship X. If the resulting ship has the same direction than the spaceship X then we call it push-ship, if it has the opposite direction then pull ship.

I hope this definition is clear and precise.

Push- and pull-ships are somehow related to SMOS.

Orthogonal push-ships (+ X, Y left):

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`x = 15, y = 6, rule = B2ek3aei4kr5q7c/S02-n3ij4krw5r6ik`

obo3bo5bobo$3o9b3o4$12bo!

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`x = 15, y = 6, rule = B2c3ajkn4knry5ci6c7c/S01c2ak3ceknq4aijny5ceij6in`

2bo3bo7bo$b2o10b2o$obo9bobo3$12bo!

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`x = 15, y = 8, rule = B2cek3acij4nr5an7e/S12ikn3iq4art5cnq`

6bo$3o3bo$bo10b3o$13bo3$12bo$12bo!

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`x = 15, y = 6, rule = B2ce3ace4rwz5ci6ak/S02ace3aen4iktwy5jn`

b2o5bo4b2o$obo9bobo4$14bo!

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`x = 16, y = 7, rule = B2ek3air4jrwy5cnq6c/S12-in3ikq4ijryz5cinr6en7e`

2bo4b2o$3o12bo$13b3o4$13b2o!