Here's one, Rick White's "Catamaran Racing for the 90's" which is very good but was written a long time ago, prior to all the Formula Spinnaker boats. There is a small chapter on spinnakers, but as I said, it was written a long time ago, things have developed quite a bit since then.

Rick, any chance of a "Catamaran Racing for the 2020's?"

http://www.amazon.com/Catamaran-Rac...?ie=UTF8&refRID=1RHJV95JQYCYND576200