## 2xn spaceship project

For discussion of specific patterns or specific families of patterns, both newly-discovered and well-known.

### 2xn spaceship project

The whole project is inspired by Calcyman's 1xn spaceship project .
Assuming the existence of 1xn spaceships, the existence of 2xn spaceships is trivial.
But 2xn spaceships are interesting for practical reasons, mainly on its length, as they could be much shorter.
It's mostly because of non-destructive reading, i.e. using a bunch of *WSSes to read a 2xn tape of blocks while moving them without destruction:
`x = 54, y = 23, rule = LifeHistory.6A\$A5.A\$6.A\$A4.A\$2.2A2\$41.6A\$40.A5.A\$46.A\$40.A4.A\$42.2A2\$52.2C\$52.2C3\$10.A\$8.A3.A30.5A\$13.A22.A5.A4.A\$8.A4.A20.A3.A8.A\$9.5A25.A2.A3.A\$34.A4.A4.A\$35.5A!`

The tape could be ignited by 50% less gliders than the 1xn case.
`x = 21, y = 3, rule = B3/S232bo\$obo3b3o2b2o6b2o\$b2o8b2o6b2o!#C [[ STOP 11 ]]`

It's obvious that 2xn tapes could emit *WSSes. 2xn tapes that emit *WSSes with less junk are favorable, such as the MWSS-emitter below.
`x = 187, y = 91, rule = B3/S232o\$2b3ob3ob3ob3ob3o2b3o3b2ob2o2b3o22b2o3b2ob2o2b2o3b3o4b2o2b2o7b3o3b2o3b2o3b2o3b2o2b3o3b2o3b3o3b2o7b2o9b3o2b2o3b2o12b3o\$2o27b2ob2o6b3o2b3ob3o2b3o4b2o3b2ob2o2b2o10b2o2b2o3b3o7b2o3b2o3b2o3b2o8b2o9b2o2b3o2b2o3b3o8b2o3b2o3b3o2b3o86\$2o\$2b3ob3ob3ob3ob3o2b2o9b2ob2o2b2o7b2ob2o11b3o13b2o3b3o2b2o2b2ob2o3b2o3b3o8b2o2b2o14b2o10b2o3b3o2b2o3b2ob2o3b2o\$2o21b2o4b3o2b2ob2o2b2o2b3o2b2ob2o2b3ob3o7b3ob3o4b2o8b2o2b2ob2o3b2o7b3o4b2o2b2o2b3o3b3o3b2o3b3o4b2o8b2o3b2ob2o3b2o!`

Problems essential to the project:
1. Which design can take full advantage of the doubled thickness? Notice that the whole spaceship don't have to move in the direction that it points, it could even travel obliquely.
2. Must the *WSS generators be transparent? In other words, is it possible to employ non-transparent generators?
3. How much construction power does a slow salvo of *WSS have? The signal types in it may be severely restricted (e.g. the whole salvo consists only the two types of signals above).
4. How can a bunch of spaceships read a tape, while returning *WSSes with full construction power, which is encoded on the tape?

Minor questions:
1. Could snakes play any role in the tape? So far, my *WSS emitter search is restricted on blinkers and blocks.
2. Develop 2xn clean fuses which can burn at any given speed, used for timing.

EDIT: Found a new emitter:
`x = 181, y = 3, rule = B3/S232o\$2b3ob3ob3ob3ob3o2b3o3b2o3b2o3b3o6b2o7b2o9b2o2b2o2b2o11b3o3b2o13b2o8b2o2b2o3b3o14b2o2b2ob2o8b2ob2o3b2o3b2ob2o\$2o27b2o3b2o7b3o2b2o2b3o2b2o3b3o3b2o2b2o2b2o3b3ob3o7b2o4b3ob3o2b2o3b3o2b2o2b2o7b3o3b3o4b2o2b2ob2o3b3o2b2ob2o3b2o3b2ob2o!`

`x = 180, y = 3, rule = B3/S232o\$2b3ob3ob3ob3ob3o2b3o8b2o2b2ob2o3b3o2b2o2b2o8b3o8b2o8b3o2b2o7b2o21b2o2b3ob3o2b2ob2o3b2o2b2o12b2o7b2o4b3o\$2o25b3o4b2o2b2ob2o8b2o2b2o4b3o5b3o4b2o2b3o8b2o2b3o2b2o2b3ob3o2b3o2b3o2b2o11b2ob2o3b2o2b2o2b3ob3o3b2o2b3o2b2o!`
Still drifting.
Bullet51

Posts: 487
Joined: July 21st, 2014, 4:35 am

### Re: 2xn spaceship project

With this approach you could also do it 1xN and use blinkers tape. Why do you prefer 2xN?

simsim314

Posts: 1539
Joined: February 10th, 2014, 1:27 pm

### Re: 2xn spaceship project

simsim314 wrote:With this approach you could also do it 1xN and use blinkers tape. Why do you prefer 2xN?

I'm not sure whether 1xN non-destructive reading is possible. If it is, it would largely reduce the size of the (hypothetical) 1xN spaceship.

EDIT: I am convinced that 1xN non-destructive reading is possible, at least theoretically.
Still drifting.
Bullet51

Posts: 487
Joined: July 21st, 2014, 4:35 am

### Re: 2xn spaceship project

What's the thinnest known orthogonal spaceship?
One big dirty Oro. Yeeeeeeeeee...

gameoflifemaniac

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Joined: January 22nd, 2017, 11:17 am
Location: There too

### Re: 2xn spaceship project

gameoflifemaniac wrote:What's the thinnest known orthogonal spaceship?

I've never seen a table of ships catalogued by the width of their narrowest phase, but I think you'd be hard pressed to find a known ship with a narrowest phase which is three cells wide (LWSS is 4 cells wide in all phases).
If you mean narrowest across all phases then codeholic's Spaceship Search Status Page shows that the LWSS is the narrowest (width of 5) and there are no known ships at that width of any other speed up to a*c/p for 2<=p<=11 and any allowed a.
wildmyron

Posts: 873
Joined: August 9th, 2013, 12:45 am

### Re: 2xn spaceship project

Potentially useful reactions:
`x = 177, y = 36, rule = LifeHistory.D\$2D\$D.D4\$156.D\$42.D12.D100.2D\$9.A2.A2.A.2A22.D.D2.A2.A4.CAC.A87.2A2.3A4.DC3.A\$10.3A3.A.A.A21.D4.3A5.D.3A86.2A2.A2.A3.D5A\$156.D23\$174.3A\$174.A\$175.A!`
SoL : FreeElectronics : DeadlyEnemies : 6a-ite
what is “sesame oil”?

Rhombic

Posts: 1003
Joined: June 1st, 2013, 5:41 pm

### Re: 2xn spaceship project

Rhombic wrote:Potentially useful reactions:
`x = 177, y = 36, rule = LifeHistory.D\$2D\$D.D4\$156.D\$42.D12.D100.2D\$9.A2.A2.A.2A22.D.D2.A2.A4.CAC.A87.2A2.3A4.DC3.A\$10.3A3.A.A.A21.D4.3A5.D.3A86.2A2.A2.A3.D5A\$156.D23\$174.3A\$174.A\$175.A!`

The problem being that you would be required to recreate those reactions exactly after one period of the spaceship.
Blocks and blinkers are the way we have to do it.
LifeWiki: Like Wikipedia but with more spaceships. [citation needed]

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Joined: November 8th, 2014, 8:48 pm
Location: Getting a snacker from R-Bee's

### Re: 2xn spaceship project

I'd still like to work on this, so I hope interest hasn't faded that much.
What approaches should we look for at the moment? Or, rather, what kind of searches or scripts would we need?
SoL : FreeElectronics : DeadlyEnemies : 6a-ite
what is “sesame oil”?

Rhombic

Posts: 1003
Joined: June 1st, 2013, 5:41 pm