Dennis, if you are referring to the NA's in Chicago, Zephyr was using a new "dacron" from North called "Sharkskin" with a mylar headsail (I do think it was a tri-radial headsail). She was quite fast as I recall. However, the main and I believe also the spinnaker from Zephyr were purchased by Bill Anderson and are now on Hallel. Bill is fast, but not as fast as Zephyr. I also suspect the cost of a "sharkskin" dacron main from North would exceed the cost of composite mains from other suppliers.
I am not advocating an arms race. I just feel there may be some personal preference regarding materials, and obviously there can be advantages in lighter air with lighter materials and PHRF racing competition. Unfortunately, due to the variability of PHRF ratings, it will never be possible to keep all districts happy regarding this issue.
