How to Add Positive Buoyancy

Practical guide for adding required positive buoyancy to Thistle boats for the 1971 Mid-Winters competition. Provides detailed instructions for installing Styrofoam in wood and fiberglass boats with specific materials and tools needed.

This is a summary. The full article text is © the Thistle Class Association — read the original scan via the link above.

• positive buoyancy
• boat construction
• Styrofoam
• regulations