Email from Grant Loretz, who was a trimmer on the Mumm 36:
There is no doubt that Barnesy was a clever guy, so many ideas most of which were well ahead of time. I can remember a project he did with his 470 jibs (double surfaced sails) when I was just a kid. I recall it being bloody fast but was deemed illegal and the project was put on the shelf but only after he had it working! Crazy thing was that it resurfaced in Freemantle in 1987 on Australia 4 when Dave was with NZ Challenge and again with this version of the AC with double surfaced mainsails on the AC75's.
A deep thinker for sure plus an all round good man!