Difference between revisions of "C/4 orthogonal"

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'''c/4 orthogonal''' is an orthogonal [[speed]] that is equivalent to one fourth of the speed of light.
'''c/4 orthogonal''' is an orthogonal [[speed]] that is equivalent to one fourth of the speed of light.


==Spaceships==
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[[Image:c4greyship.png|framed|right|A [[greyship]] created by Hartmut Holzwart using several methods of stabilization<br/>{{JavaRLE|c4greyship}}]]
The first c/4 orthogonal spaceship, [[119P4H1V0]] was discovered by [[Dean Hickerson]] in December [[:Category:patterns found in 1989|1989]]. Hickerson then found a small [[tagalong]] for this spaceship which could be attached in two different ways. These three spaceships were the only known c/4 orthogonal spaceships until [[Hartmut Holzwart]] discovered [[163P4H1V0]] in July [[:Category:patterns found in 1992|1992]]. The searches conducted by Holzwart also turned up the first method of creating arbitrarily large c/4 orthogonal spaceships by repeatedly attaching a tagalong to the back of [[103P4H1V0]]. Holzwart also found the first orthogonal [[Types_of_spaceships#Non-monotonic_spaceship|non-monotonic]] spaceship, [[non-monotonic spaceship 1]], during this search. In May [[:Category:patterns found in 1996|1996]] [[Tim Coe]] discovered [[46P4H1V0]], the smallest known spaceship of this speed. From February to March, [[:Category:patterns found in 2006|2006]] Hartmut Holzwart found several ways to create c/4 orthogonal [[greyships]].
 
The first higher [[period]] c/4 orthogonal spaceship was discovered by [[David Bell]] in September [[:Category:patterns found in 2000|2000]]. It had a period of [[:Category:spaceships with period 20|20]] and consisted of a [[block]] [[puffer]] found by [[Jason Summers]] and a side [[spark]]er used to delete the blocks. In the following month Summers found period [[:Category:spaceships with period 8|8]] and [[:Category:spaceships with period 12|12]] spaceships based off of a failed [[blinker]] puffer and a spaceship with a forward [[polyomino#domino|domino]] spark. Several other periods were achieved by [[perturb]]ing the output of a period 168 puffer discovered by [[Paul Tooke]] in November [[:Category:patterns found in 2003|2003]].


==Puffers==
==Puffers==

Revision as of 05:08, 17 August 2010

c/4 orthogonal
46p4h1v0.png
Spaceship Yes
Puffer Yes
Rake Yes
Wickstretcher Yes
Gun No

c/4 orthogonal is an orthogonal speed that is equivalent to one fourth of the speed of light.

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Puffers

Jason Summers found the first c/4 orthogonal puffer, which had period 9732 and was extremely dirty, in January 1999. In November 2003 Paul Tooke discovered a versatile period 168 puffer the output of which could be perturbed by sparkers to produce puffers of lower periods.

Rakes

The lowest period c/4 orthogonal rakes are based on Paul Tooke's p168 puffer. A method of rake construction is also known for all periods above about 800.

Wickstretchers

c/4 orthogonal was the first speed known to contain a wickstretcher, wickstretcher 1. It was discovered by Hartmut Holzwart in October 1992 and stretched ants from an ant stabilizer found by Dean Hickerson.

See also

References

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