I'm sure any sailmaker would like to know as exactly as feasable how many sails will be produced per year for the class.

The class association is a good basis to determine the approximate number of actively sailed N20 boats, and using the avg. main/jib every other year and spin every year would put the total annual sail production at......?

And what R&D are we talking about here?
- shape
- size
- material

I'm not sure I understand how much R&D costs (labor, testing, materials,.... what else?)