Back in 1995 a series of interesting articles appeared on the drlaser web site concerning telltales and my Tuft System. The series was prepared by Shevy Gunter and involved several communications between Shevy, Mikko Brummer of WB-Sails Ltd. in Finland, and myself.
These articles can no longer be found on the original web site. However, I had fortunately captured the original pages and saved them in my archives.
The entire set of documents are presented below. Although there are multiple cross links between the various files I suggest that you first read them in the order shown here.
Telling Tales (WB Sails, Finland)
A Trim Primer for Main and Headsail Balance (Shevy Gunter)
A Truer Tale of Telltales? (Shevy Gunter)
Telltales: One man's fact, other man's fiction (WB Sails)
The WB-Sails web site contains a number of excellent articles on sails and sail aerodynamics. I suggest that you visit their site: WB-Sails, Finland. Select the Aerodynamics page to see other WB-Sails aerodynamics articles.