4568/456/4: The basic c/2 ship in this family of rules evolves into a pattern that repeats its structure over time, sort of a spacefiller.
x = 4, y = 3, rule = WMPVN-4568_456_4
4568/456/5: From here (c > 4) the ship behaves as a ship.
x = 4, y = 3, rule = WMPVN-4568_456_5
A simple 3x3 square self-replicates endlessly. Contained inside a square. The basic ship is faster than
x = 3, y = 3, rule = WMPVN-4568_456_5
4568/456/6: Nothing to see here, except for this bigger ship that will play an important role later:
x = 9, y = 8, rule = WMPVN-4568_456_6
4568/456/7: The bigger ship doesn't work here.
This ship, similar to the basic ship, replicates itself, showing sawtooth-like growth and leaving a trail of basic ships behind on a Sierpinski triangle.
x = 5, y = 3, rule = WMPVN-4568_456_7
4568/456/8: The bigger ship works again, and will work for any c > 8. When c = 8, it is a basic ship backrake. A collision between two basic ships creates a new, really resilient 2c/17 basic ship frontal rake. This simple pattern shows it all:
x = 23, y = 28, rule = WMPVN-4568_456_8
I haven't found any interesting behavior for c > 8.