Push- and Pull-Ships

[2718281828]

This a thread for push and pull ships. Examples are below.

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):

Code: Select all

x = 15, y = 6, rule = B2ek3aei4kr5q7c/S02-n3ij4krw5r6ik
obo3bo5bobo$3o9b3o4$12bo!

Code: Select all

x = 15, y = 6, rule = B2c3ajkn4knry5ci6c7c/S01c2ak3ceknq4aijny5ceij6in
2bo3bo7bo$b2o10b2o$obo9bobo3$12bo!

Orthogonal pull-ship:

Code: Select all

x = 15, y = 8, rule = B2cek3acij4nr5an7e/S12ikn3iq4art5cnq
6bo$3o3bo$bo10b3o$13bo3$12bo$12bo!

Diagonal push-ship:

Code: Select all

x = 15, y = 6, rule = B2ce3ace4rwz5ci6ak/S02ace3aen4iktwy5jn
b2o5bo4b2o$obo9bobo4$14bo!

Knight push-ship:

Code: Select all

x = 16, y = 7, rule = B2ek3air4jrwy5cnq6c/S12-in3ikq4ijryz5cinr6en7e
2bo4b2o$3o12bo$13b3o4$13b2o!

[Macbi]

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

In particular I'd say that oscillators and still lifes are just a special kind of spaceship (in the same way that squares are just a special kind of rectangle). So a push or pull-ship is just a special kind of SMOS.

It might be interesting to search for a push or pull ship that goes faster than its constituent ship.

[Saka]

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

In particular I'd say that oscillators and still lifes are just a special kind of spaceship (in the same way that squares are just a special kind of rectangle). So a push or pull-ship is just a special kind of SMOS.

I dont think these can be considered as SMOS. SMOS stands for "Spaceships Made of Other Spaceships", and their definition is (according to the wiki) "a spaceship in a cellular automaton, consisting of multiple other spaceships colliding with each other, causing a reaction to place on where all of the spaceships are regenerated separately, but with a displacement value."

Since these are not made of multiple spaceships crashing into each other, rather a spaceship crashing into a non-moving object or a constellation of them, I would not consider these "SMOS".

[2718281828]

It might be interesting to search for a push or pull ship that goes faster than its constituent ship.

Here, we go, no problem at all even to go much faster:

Code: Select all

x = 15, y = 9, rule = B2cei3any4ir5y/S02ei3ain4aikt6c7e
13bo2$12bobo$bo5bo2$obo3$13bo!

Code: Select all

x = 16, y = 11, rule = B2ci3ajr4aekrtw5ae6k7c/S1e2ai3ny4ajnz5einq6ac7e
13b3o2$13bobo3$7b2o$3o2$obo2$13b2o!

Code: Select all

x = 16, y = 9, rule = B2cek4aijknt5acj6an8/S01e2ace3cen4nrwyz5aijry6kn7
14b2o$15bo$13bobo$8bo$b2o$2bo$obo2$14bo!

They can move with orthogonal speeds of at least c/5, the crashing ship (X) can be quite slow, e.g. c/19 in the latter example.

[2718281828]

I think the definition requires some adjustments. We should talk about shifting-ships or something like this, with pull and push ships beeing a special case. As the resulting ship can go in any direction:

Code: Select all

x = 16, y = 9, rule = B2-an3n4ajy5q/S012a3cen5c6e
13bo$15bo$13bobo$7bo$o$2bo$obo2$13bo!

Code: Select all

x = 16, y = 8, rule = B2ek3aein4j5nry6c8/S01c2ace3jn4ai5acjk
14bo$13b3o$7bo2$bo$3o2$13bo!

Code: Select all

x = 16, y = 9, rule = B2k3ai4a5qry7e/S01e2ce3ijnr4eknr5anq6c
14bo$13bo$13b3o$7bo$bo$o$3o2$13bo!

Edit1: Also rakes exist:

Code: Select all

x = 27, y = 21, rule = B2-an3acekr4air5enq6i/S12cek3n4krtw5y6ci
25bo$25bo4$25bo$24b3o$13bo10b3o$12bobo4$bo5bo$obo4bo17bo$24bobo5$13bo
11bo$13bo11bo!

[Hunting]

Code: Select all

x = 10, y = 5, rule = B2-a3i8/S1e2i3-a4e8
2bo4bo$9bo$2obo3bo$9bo$2bo4bo!

[praosylen]

The quintessential example:

Code: Select all

x = 3, y = 12, rule = B3/S135
bo$bo7$bo$bo$obo$obo$obo!

[Hdjensofjfnen]

The quintessential example:

Code: Select all

x = 3, y = 12, rule = B3/S135
bo$bo7$bo$bo$obo$obo$obo!

I was surprised to find that the rule has two far more common ships:

Code: Select all

x = 15, y = 6, rule = B3/S135
2bo9bo$b3o7b3o$bobo7bobo$o3bo9bo$bobo10bo$o3bo!

EDIT: By over a factor of 55!

[Moosey]

I think the definition requires some adjustments. We should talk about shifting-ships or something like this, with pull and push ships beeing a special case. As the resulting ship can go in any direction:

Code: Select all

two contradicting spaceships 

Code: Select all

more different direction push ships

Code: Select all

etc.

Edit1: Also rakes exist:

Code: Select all

rakes

Don’t forget that bestfriends diagonal ship!

[Gustone]

neckropost aletr

Code: Select all

x = 27, y = 8, rule = B34t/S235i
bo13bo9bo$3o4b3o4b3o7b3o5$24b3o$14b3o!

[confocaloid]

How about calling these "elementary non-adjustable mixed recollisions"?
A recollision is a repeat collision between two or more patterns (such as a spaceship and a stationary constellation) which have collided before. Each of colliding patterns should be periodic or stable by itself. The resulting pattern can be a spaceship (push-ship/pull-ship/shifting ship), or an oscillator, a puffer, etc.

Recollision oscillator (p76):

Code: Select all

x = 8, y = 4, rule = B3-ceky6a/S02-n3-ce4iy5a6ck
bo$2bo$3o3b2o$6b2o!

Recollision spaceship (c/395 orthogonal; there's a glider hitting a two-block constellation):

c/395o found by Carson Cheng in apgsearch:

Code: Select all

x = 11, y = 13, rule = B36a/S235y
2bo$2o$2o2$2bo$2o6$9b2o$9b2o!

Recollision spaceship (10c/88 diagonal, pond + 4 spaceships or 2 ponds + 4 spaceships):

a different rule with a 5c/44d almost SMOS. guess you could call it a SMOSAP (spaceship made of spaceships and pond

Code: Select all

x = 24, y = 24, rule = B3-j4jqtz5cej6-i7e8/S2-in3-a4ik5ekqr67e8
5b3o$5b3o4$2o$2o$2o3$11b2o$10bo2bo$10bo2bo$11b2o5$21b3o$21b3o$22bo$18b
2o$18b3o$18b2o!

Recollision rake (c/124 diagonal, glider hitting a loaf+block constellation):

Code: Select all

x = 21, y = 16, rule = B3-c/S23-ceky
18b2o$19b2o$18bo6$3bo$4b2o$3b2o$8b2o$bo6b2o$obo$o2bo$b2o!

Edit: recollision gun:

Unusual p232 gun for the 19c/76d consisting of a p40 repeatedly colliding with... a 19c/76d!

Code: Select all

x = 4, y = 6, rule = B3-j4ez5c7/S2-ci3-a4i6a7
3bo$2bo$2bo$o2bo$o2bo$b3o!

The recollision should be mixed (like spaceship+oscillator or spaceship+still life), to distinguish from SMOSes and OMOSes which are discussed elsewhere. There are also adjustable / engineered examples, but those are also discussed elsewhere.

[pipsqueek]

c/9 push ship

Code: Select all

x = 6, y = 3, rule = B2ek3eijnr4y5iy6i/S1e2-en3j4w5iy6i
o$bo2b2o$o!

c/10 push ship

Code: Select all

x = 6, y = 3, rule = B2eik3-ackr4aet5iqy7c/S1e2-in4i5ei
o$bo2b2o$o!

c/11 pull ship

Code: Select all

x = 6, y = 3, rule = B2ek3einqy4akt5ijny7e/S1e2-in3cj4ac5aeij8
o$bo2b2o$o!

c/15 pull ship

Code: Select all

x = 7, y = 3, rule = B2ek3ceinr4ajqtwyz5-ejq6ck/S01e2-e3ky4iknqtz5ackry6ikn7e
o$bo3b2o$o!

you can also go to c/16

Code: Select all

x = 7, y = 3, rule = B2-ac3eiy4aejntwy5-cqry6ck7c8/S1e23aky4ajknrt5ejry6ek8
o$bo3b2o$o!

another c/10 push ship

Code: Select all

x = 5, y = 3, rule = B2ekn3ceiny4acejkqw5ciq6cek78/S01e2-in3ckr4jq5ij6k
o$bo2bo$o3bo!