The Coe ship is the first known period-16 c/2 orthogonal spaceship, discovered by Tim Coe on October 26, 1995. It consists of a lightweight spaceship stabilizing a sparky, modified heavyweight spaceship.
The Coe ship appeared in an asymmetric soup found by apgsearch in December 2015, making it the first naturally occurring non-period-4 spaceship. A second Coe ship appeared on Catagolue in June 2016, and four more shortly after. Currently it is the 35th most common naturally occurring spaceship, being more common than HWSS on HWSS 8, but less common than MWSS on HWSS 13.
Mark Niemiec found a 9-glider synthesis of this spaceship on October 28, 1995. A 7-glider synthesis was discovered by 2718281828 on December 8, 2017.
The Coe ship can be used as a puffer engine because it produces a long back spark, which leads to puffers and rakes, as shown below.
Coe ship powering a backward rake
Coe ship powering a forward rake
Coe ship powering a block
- 28P16H8V0.1 at Heinrich Koenig's Game of Life Object Catalogs