117P9H3V0 is an orthogonal c/3 spaceship discovered by David Bell in May. It is based on a period 3 spaceship with a loosely connected back component which could be removed to form a period 9 spaceship, being the first spaceship of this period to be found. In September 1997 Bell found a smaller period 3 component to support the period 9 trailing edge. In June 2001 Paul Tooke found a much smaller period 9 spaceship, 55P9H3V0.
The period 3 spaceship that was the basis for 117P9H3V0RLE: here
A small, related period 9 spaceshipRLE: here
- ↑ David Bell's archive of c/3 ships and puffers in Life