With the bigger more voluminous hulls we are now getting, Greg probably wasn't far wrong, simply thinking ahead of the hull shapes of the time. Two up the 17.5 is probably smallish and for most of the time the Uni sailors could cope with a bigger spinny, the only time Uni the present spinny is a handful is in + 20knots gusts.

What has changed most is the shape of the sail which has become more and more flatish much more like a big Genoa. Without the class rules I would suspect they would become much flatter stll.