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2005 September 19

Spaceships
More new c/4 Diagonal Spaceships

New c/4 Diagonal Spaceships Pt.1 Here's another batch of new c/4 Diagonal Spaceships that Nicolay Beluchenko has found.

New c/4 Diagonal Spaceships Pt.2

New c/4 Diagonal Spaceships Pt.3

New c/4 Diagonal Spaceships Pt.4

Harmut Holzwart has extended a few of these new spaceships by adding some tagalongs for which there was previously no spaceship for attachment. New c/4 Diagonal Spaceships Holzwart

2005 September 17

Spaceships
c/6 Diagonal Spaceship

Diagonal c6 spaceship Nicolay Beluchenko has found the first known c/6 Diagonal Spaceship.

(A list of known spaceship speeds)

2005 September 10

Engineered Objects
Grow-By-One Pattern

Grow By One Pattern In his continuing quest for Diagonal Spaceships, Nicolay Beluchenko has also found what is currently the smallest known "Grow-By-One" pattern. This type of pattern is one whose population growth rate is exactly linear, without any fluctuations, adding a single bit every generation. Shown here is a slight improvement by David Bell, which starts a generation earlier than Beluchenko's orginal pattern, with a population of 44 at generation 0. (The purpose of the Lightweight Spaceship is to smooth out the fluctuations in the paired wickstretcher's population.)

Grow By One Object The second pattern shown here is a version which is also a single object (starting with a population of 53).

2005 September 08

Oscillators
New longer period oscillators

description Jason Summers has found a couple of new longer period oscillators. One is fairly small, with a period of 22, the other has a period of 28 and requires some fairly large Period 7 oscillators to help stabilize it.

2005 September 07

Spaceships
More new c/4 Diagonal Spaceships

New C4 Diagonal 1 Nicolay Beluchenko has found another batch of new c/4 Diagonal Spaceships. As before, these are all presented in no particular order.

New C4 Diagonal 2

New C4 Diagonal 3

2005 September 06

Spaceships
Lineship Update

p96 c/12 diagonal lineship: David Bell, 24 June 2005 On June 24th, David Bell produced an optimized version of Jason Summers' original lineship (shown in reduced scale at right -- click the thumbnail for the RLE, or here for a full picture). There have been several further developments along these lines.

p768 c/12 diagonal line burner: dgreene, 25 June 2005 dgreene used some of David Bell's new compact Cordership technology to produce a modified tail section for the revised lineship which repeats at p768 instead of at p96.

[The thumbnail at right shows only the modified tail section -- click here for a picture of the full pattern.]

smaller diagonal c/12 period 96 lineship:  David Bell, 17 July 2005 David Bell followed this with a redesigned diagonal c/12 period 96 lineship. In this variant, the creation of the line at the front is done in pieces which are then welded together to form the line, using the repair techniques described in the "Cutting and Repairing Diagonal Lines" posting. The back end has also been reduced, since a sideways rake is not needed to ignite the line.

Again, only the smaller back end is shown in the thumbnail; a full-sized image is here.

Adjustable-period growing/shrinking Corder-based c/12 lineship:  Nicolay Beluchenko, 17 July 2005; optimization by David Bell. The Cordership at the tail end of the adjustable-period lineship shown at right (full-sized image here) is responsible for igniting the stabilized end of line whenever it gets near to it. Nicolay Beluchenko points out that this Cordership could be adjusted by moving the trailing Cordership by multiples of 22 cells diagonally, rather than 88, if the front of the line were constructed in length-22 segments as well (but this would make the front of the ship much larger).

Greyships & Spacefillers
Greyship Update

smaller 2c/4 perpendicular greyship: Hartmut Holzwart, 14 July 2005 2c/4 perpendicular greyship: Hartmut Holzwart, 14 July 2005 Hartmut Holzwart has constructed several new 2c/4 greyships (spaceships consisting primarily of alternating lines of ON and OFF cells -- see this previous post.) Here are two versions of a 2c/4 perpendicular greyship, in which the direction of travel is perpendicular to the alternating stripes, instead of parallel to them:

Perpendicular grey ship in triangle form (-1/10,1,-1/4) Perpendicular greyship in triangle form (-1,1,1/4) It's possible to shorten an arm of one of the above ships to get a triangle, as shown at right. Some further incomplete perpendicular-greyship results can be found here. Another triangle that uses some of these connections is shown at the far right.

c/3 greyship: Hartmut Holzwart, 24 July 2005 Other greyship speeds are also possible. Here is a parallel greyship that travels at c/3 instead of c/2:

Engineered Objects
Bobsled Run Update

revised switch-engine 'bobsled run' using boats as catalysts:  David Bell, 2 July 2005 On July 2, David Bell noticed that tub-with-tails are larger than needed to form switch-engine lanes (see the bobsled-run posting on 24 June 2005). Several smaller still lifes with tub-shaped protrusions can provide the same catalysis; boats, barges, long boats, long barges, etc. can all be used. At right is a revised switch-engine 'bobsled run' using boats as catalysts.

P3450 switch-engine swimmer based on a p9660 swimmer by David Bell, 2 July 2005 Long barges can be used as a common boundary between two adjacent lanes without any possible interference. Barges are sufficient if traffic in adjacent lanes is in opposite directions, or if the timing of traffic in two parallel lanes can be controlled to avoid mirror-image switch-engine phases. At right is a p3450 'swimmer' -- a switch engine doing laps in a lane made of boats: