Badwater Bill wrote:

In the second and third shots there you'll notice an effect of either
four nozzels or some kind of thrust director in the main nozzel
pushing the gasses symetrically out in 4 quadrants. I wonder what
this is? Anybody know what's going on?

What kind of launch vehicle was it? Perhaps it had fins (presumably 4) that
were causing a trailing vortex, and those votices were shaping the
propellant gases?

Russell Kent