Thistlebase
Invisible Wind Pennant
Technical article describing a DIY wind pennant device designed by Ralph Kelley of Sacramento Fleet. The pennant is fabricated from piano wire and acetate, featuring a copper-plated thrust bearing and flexible design to dampen oscillations without creating excessive masthead movement.
View original on Google Drive · page 6
The scanned issue opens in Google Drive; turn to page 6.
This is a summary. The full article text is © the Thistle Class Association — read the original scan via the link above.