Thistlebase
Official Sail Plan Method
Technical diagrams and specifications for measuring spinnaker and mainsail dimensions on Thistle Class sailboats, establishing the official 1952 measurement standard.
View original on Google Drive · page 4
The scanned issue opens in Google Drive; turn to page 4.
This is a summary. The full article text is © the Thistle Class Association — read the original scan via the link above.