TrBiggar, it wasn't a Boomerang, but rather a shuttle loop. Close enough for jazz, I guess. :)
coo man chu, you've hit on exactly what I have been saying for better than ten years now. In fact, let's take it a step further. I suspect that the shoulder bar was developed in part because early testing on the Corkscrew was done with racing belts, probably by people who had no idea how to adjust them properly. The shoulder bar was developed as an attempt to emulate the racing belt. Pity it doesn't work.
In fact, the shoulder bar is not adequate to secure a rider through, for instance, a slow inversion. We got a dramatic demonstration of that with the Flight Commander incident at Kings Island (although that ride did have something of a lap bar) and with the Drop Zone incident at PGA. The shoulder bar does not secure the body at its center of mass, and therefore will allow the rider to slide out from underneath. A lap bar, on the other hand, if properly designed, will positively prevent the rider from being dumped from the seat.
--Dave Althoff, Jr.
Who is living proof that you can safely do a barrel roll without a shoulder restraint....