Does anybody know if the head rests were designed for roll-over protection?
There is a copy of a RAF letter in the Chapter 8 archives (1996) that thoroughly explains the structural purpose and limitations of the triangular head rest. The head rests, as originally designed for the Long-EZ, offer limited roll-over protection in the event that the plane flips upside-down with little to no forward speed. They were never intended to protect the passengers at crash speeds. The Cozy offers more protection because of its turtleback and bulkhead immediately behind the pilot and passenger.