A recurve bow, as you are aware, is a flatbow that has the limb ends bent forward to some degree. The reason or thought was that these would flex and open up and form a second lever, get more speed, make for less string angle on a shorter bow, and maybe a few other things.
I believe a "static recurve" means that these curves are designed so that they do not flex as much, do not open up, but still create a second lever effect etc.
RER has it down with respect to what I consider static recurves. Kevin's bows are pretty dang nice.
ChuckC