|View static image|
|Number of cells||15|
|Discovered by||John Conway|
|Year of discovery||1970|
An overweight spaceship (or OWSS for short) is a would-be spaceship similar to the lightweight spaceship, middleweight spaceship and heavyweight spaceship, but longer. On its own an overweight spaceship is unstable. For example, in the shortest overweight spaceship, the three cells at its top do not die off like the corresponding sparks at the top of the smaller spaceships. Nonetheless, it can be escorted by true spaceships to form a flotilla.
For OWSS with top spark over 4, minimal escort size difference is 4, as shown.
It is also possible to stabilize the OWSS with more OWSSes, which then have to be stabilized by more xWSSes. An example is shown below.
Many lengths of overweight spaceship can be constructed by colliding gliders. Recent syntheses are collected in the xq4 synthesis listing in Catagolue; a number of older recipes can be found in Mark Niemiec's synthesis database.