Thanks for the reply Andrew. My problem is that the old manual reccomends a 1-1/2 inch spreader rake for the Prindle 18,18-2,and 19. Big difference in boats. Second, dacron sails get fuller as they age (opposite of mylars). I'm sure this is a factor. And finally, the spreader rake is currently set at 1/2 inch with the diamonds tighter than hell (the way I received the boat) which I know is incorrect for a soft rig(this is the prebend setting for mylar sails). It flies a hull in 6 knots. So I'm going to reset everything including the spreader rake. Come on guys/ladies, give me a number or a way to determine this.

TIA
Jack