I assumed Sam5's three dimensional explosion model which he so often illustrates. I also assumed that it would progress in a fashion that everything doubles its distance to the center in the same amount of time. And there I was wrong: As far as I can see this is just the big bang expanding space model with an arbitrarily chosen "center" (more of a viewpoint transformation, the center can be put anywhere).

Putting a real center into this model of course necessitates rapid acceleration. Every time an object doubles its distance from the center, it also has to double its speed. This doesn't work so good.

However, it does work with constant speeds that were set at the time of the big bang as far as I can figure. Problem with that is that in order for the universe to look uniform in every direction, the higher the speed the more likely any given particle would have to have it in order to fill the volumes that are expanding by the cube of the distance from the center. That, or I'm just confused now. 8-[