INTERNATIONAL 600
Specifications
Hull
| LOA | 36 ft |
| LWL | 26 ft |
| Beam | 10 ft |
| Draft | 5 ft |
| Displacement | 15,000 lb |
| Hull speed1.34·√LWL | 6.8 kn |
Rig & Sails
| Iforetriangle height | 43 ft |
| Jforetriangle base | 13.3 ft |
| Pmainsail luff | 36.5 ft |
| Emainsail foot | 16 ft |
| FLforestay | 13.3 ft |
| Mainsail | 601.3 sq ft |
| Jib (100%) | 286 sq ft |
| Spinnaker | 486.1 sq ft |
About the INTERNATIONAL 600
Designed by Robert G. Henry Jr. and built by DeDood and Sohn Yacht und Boatwerks (GER) in 1965, the International 600 is a classic 36.0 ft masthead yawl with a full/long keel. With a displacement of 15000.0 lb and a comfort ratio of 37.22, it offers a stable, heavy-displacement cruising platform, though the exact number of hulls built remains unknown.
- Best for:
- This boat suits experienced coastal cruisers and those seeking a traditional, heavy-displacement vessel with a full keel for predictable handling and comfort. Its high comfort ratio and substantial displacement make it ideal for shorthanded cruising where stability and motion comfort are prioritized over high-speed performance.
- Bluewater capability:
- With a capsize ratio of 1.62 and a D/L ratio of 381.0, the International 600 demonstrates strong offshore stability and resistance to capsizing, making it well-suited for bluewater cruising despite its age.
- Comparables:
- Comparable boats include other 1960s full-keel yawls such as the Tartan 36 or O'Day 36, which share similar displacement characteristics and traditional layouts. These vessels offer similar heavy-displacement comfort and traditional sailing dynamics, appealing to owners who prefer classic aesthetics and seakindliness over modern planing capabilities.
Performance
Pricing
We don't have market pricing data for the INTERNATIONAL 600 yet. If you own one, help other buyers — what did you pay for it? Reports build a community price estimate over time.
Estimated Cost of Ownership
Based on 36ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
16 reported issues across 9 systems for the INTERNATIONAL 600, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a INTERNATIONAL 600? This is an in-depth report on the faults this model is known for — so you know exactly what to check when you walk the boat. For the price of a coffee.
- ✓ All 16 specific issues — severity, symptoms & fixes
- ✓ Model-specific pre-purchase inspection checklist
- ✓ Downloadable PDF to take to your surveyor — yours to keep
One-time $2.99 · secure checkout by Stripe · instant access · 30 days online, PDF yours to keep
Similar Sailboats
Which engine powers your INTERNATIONAL 600?
We haven't confirmed the engine for this model yet. If you own or know one, tell us — as owners report in, we build an accurate picture over time.
Brands sometimes mentioned for this model: Yanmar, Westerbeke, Universal, Atomic 4 — is it one of these?
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Used sails that fit the INTERNATIONAL 600
Checking eBay for sails sized to this boat's rig…