as a note of information, the Rinmaster is called the RM+P, it was designed by Pat. It uses a solid foam core wing with a small spar cap imbeded in the surface top and bottom. very simple but apparantly very effective. I have one on the board right now for my stepdaughter, she is building it herself. Reports say it comes in in the very low 20 oz range, I heard of one that was 21 or 22 oz! It has a modern airfoil. In short, it only looks like a ringmaster.
Should note that this project was a collaboration with Dee Rice.