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  • H.Koenig
  • Adam Goucher
  • Dave Greene


2011 January 29

Smallest LWSS Corderrake

6-engine Cordership LWSS backrake
by Adam P. Goucher and Dave Greene, 23 March 2010,
based on a reaction by 'Extrementhusiast'
In March of last year, Adam Goucher built a new, very compact backwards c/12 LWSS rake, using a reaction posted by 'Extrementhusiast' on the forums in which a Herschel interacting with a beehive re-creates the beehive with an 8-cell diagonal offset -- exactly the right distance to allow a Cordership to re-use the same beehive repeatedly. Switch engines produce Herschels in the correct orientation as part of their natural evolution, so the only remaining problem is to suppress some leftover junk, using a second Cordership "wing".

Variant of Dean Hickerson's
7-in-a-row Cordership from July 1998,
made from a single line of 6 switch engines.
Dave Greene, 13 March 2010
A tangential discovery was that Dean Hickerson's "7-in-a-row Cordership" could be reduced to 6 engines using the same central switch engine spacing as in the LWSS backrake.

Continue reading "Smallest LWSS Corderrake" More

2007 December 16

Wicks & Fuses
Frozen LWSS fuse / rake

Sideways LWSS rake based on a glider+constellation->LWSS reaction.
This puffer produces a row of still-life constellations, each
of which can output an LWSS and two gliders when hit by a glider.
The result is a repeating sideways LWSS generating reaction
at the back, progressively thawing the "frozen LWSS" string.
David Bell, 4 November 2007.
David Bell has constructed a two-stage sideways LWSS rake, where the first stage builds "frozen LWSSs" -- a chain of repeated still-life constellations -- and the second "thawing" stage consists of a glider that follows the chain (at a much slower speed) and liberates the stored LWSSs.

Continue reading "Frozen LWSS fuse / rake" More

2007 September 15

New Period 36 c/3 Puffers

P36 c/3 Puffers David Bell found a new type of Period 36 c/3 puffer engine, and gave some examples that produced a Block, Boat, Beehive and backward rake Glider. Nicolay Beluchenko then showed how the Beehive and Glider rakes could be combined to produce a forward Glider rake.

P36 c/3 backward Glider rake

2005 October 27

Adjustable Clean c/4 Glider Rake

description Some recently-discovered c/4 diagonal spaceships include accessible sparks, which can be used to make alterations to other active or stable patterns in passing. Recent discoveries include alterations that reflect gliders 180 degrees, or convert a single glider into multiple gliders — along with a c/4 wickstretcher with a wick that can be ignited by gliders, where the resulting fuse can be timed to burn out without harming the wickstretcher engine.

David Bell has used these results to complete an adjustable clean c/4 rake, with periods of the form 4508+32N. Bell's description follows:

The rake has an engine convoy at the front, two convoys forming lines behind that, and a V-shaped convoy at the back. The recipe to create the next rake in the series is:

Move the top line convoy orthogonally right by 6 cells. Move the left line convoy orthogonally down by 6 cells. Move the V-shaped convoy diagonally back by 6 cells.

This will increase the period by 32 generations.

The modifications can be be made in the opposite direction to form the earlier rakes in the series. Moving the convoys by 300 cells creates the first rake in the series, having the period 4508.

2005 June 18

New Compact Corderships

New 5-engine Cordership  David Bell  5 June 2005 David Bell has constructed a new, compact 5-engine Cordership that contains a releasable sideways glider, and has compiled a series of related results. The pattern at the far right shows a number of ways for the Cordership's northeast edge blocks to be suppressed, allowing the sideways glider to escape.

Paul Tooke's 3-engine Cordership turning an LWSS These new results build on other new Cordership constructions recently -- in particular, a small 3-engine Cordership discovered by Paul Tooke (with the help of Paul Callahan's handy 'gencols' utility) on January 12 of last year. David Bell discovered that it can turn an LWSS 90 degrees, as shown here.

Bell has also produced a series of related Cordership-rake patterns: A Cordership-based glider-to-backward-LWSS reaction
A 'beehive-puller' Cordership
A p96 forward glider rake
A new smaller p384 'Freeze-Tag' spaceship
A reaction converting two forward gliders to an HWSS
p192 backward HWSS rake
A p96 backward HWSS rake
A p768 backward HWSS rake
A p96 forward LWSS rake
A p96 forward MWSS rake
An alternate p96 forward MWSS rake
A p768 forward LWSS rake
A high-period Cordership-based feedback loop
A wide thin p96 backward rake
A p288 'litterbug' spaceship
A p96 backward LWSS rake
An alternate p96 backward LWSS rake
A p96 backward MWSS rake based on a loaf puffer
A backward LWSS puffer based on an eater/tub-with-tail puffer

Related to this last pattern, he notes that a line of tub-with-tails "can support one side of a switch engine without being modified. Two diagonal lines of them can support one or more switch engines at the ends, and one line can support a 3-engine wing component."

Update: 24 June 2005 2:20p

A diagonal c/12 p96 glide-symmetric double backward rake
A p96 three-stage tail producing a double-backward-rake spaceship
A p96 block-staircase puffer tail for the double backward rake
A p96 diagonal c/12 period 96 sideways glider-inserter rake
... And an updated version of Jason Summers' c/12 p96 diagonal lineship: see the new posting on this subject.