KING 40
Specifications
Hull
| LOA | 39.73 ft |
| LWL | 34.78 ft |
| Beam | 12.14 ft |
| Draft | 8.23 ft |
| Displacement | 15,653 lb |
| Ballast | 7,275.5 lb |
| Hull speed1.34·√LWL | 7.9 kn |
Rig & Sails
| Iforetriangle height | 53.31 ft |
| Jforetriangle base | 15.42 ft |
| Pmainsail luff | 52.49 ft |
| Emainsail foot | 17.22 ft |
| FLforestay | 15.4 ft |
| Mainsail | 899.1 sq ft |
| Jib (100%) | 411 sq ft |
| Spinnaker | 1,077.8 sq ft |
About the KING 40
From MILLS 39. Later became the SUMMIT 40. See SUMMIT 40 for more details.
The King 40 is a fractional sloop designed by Mills Design and built by Summit Yachts (USA) in 2001. With a displacement of 15653.0 lb and a beam of 12.14 ft, this vessel represents a specific single-year production run that combines substantial build quality with distinct structural vulnerabilities.
- Best for:
- This boat suits experienced coastal cruisers and offshore adventurers who prioritize a heavy, stable platform with a high comfort ratio of 24.0, provided they are prepared for significant structural maintenance.
- Bluewater capability:
- With a low capsize ratio of 1.94 and substantial ballast of 7275.5 lb, the King 40 is inherently stable and well-suited for offshore passages, though its bluewater readiness is contingent on addressing critical structural integrity issues.
- Comparables:
- Comparable to other heavy-displacement cruising sloops from the early 2000s with similar D/L ratios around 166.1, such as the Hallberg-Rassy 42 or older Tartan models, due to its emphasis on seakeeping over pure speed.
Direct variant of the KING 40
Near-identical models — same hull, builder and designer, re-badged or lightly changed. Specs and owner-reported issues are typically shared across the group, so a sister model's page may carry detail this one doesn't.
Performance
ORC Performance Data(7 certificates)
Measured performance data from ORC (Offshore Racing Congress) certificates.
Polar Diagram
Boat speed (kn) vs. true wind angle. Source: ORC
Racing Ratings
Triple Number
ORC Measured
Sail Areas (ORC)
Speed Table (kn)
| TWA \ TWS | 6 | 8 | 10 | 12 | 14 | 16 | 20 |
|---|---|---|---|---|---|---|---|
| 52° | 5.8 | 6.9 | 7.5 | 7.8 | 7.9 | 8.0 | 8.1 |
| 60° | 6.1 | 7.2 | 7.7 | 8.0 | 8.1 | 8.2 | 8.3 |
| 75° | 6.4 | 7.4 | 7.9 | 8.2 | 8.4 | 8.6 | 8.8 |
| 90° | 6.3 | 7.5 | 7.9 | 8.2 | 8.5 | 8.9 | 9.4 |
| 110° | 6.4 | 7.6 | 8.2 | 8.6 | 8.9 | 9.2 | 9.7 |
| 120° | 6.2 | 7.5 | 8.1 | 8.6 | 9.2 | 9.6 | 10.3 |
| 135° | 5.6 | 7.0 | 7.8 | 8.3 | 8.8 | 9.4 | 11.1 |
| 150° | 4.8 | 6.0 | 7.0 | 7.8 | 8.2 | 8.7 | 9.9 |
| Beat VMG | 3.8 | 4.6 | 5.2 | 5.5 | 5.7 | 5.8 | 5.9 |
| Run VMG | 4.1 | 5.2 | 6.1 | 6.9 | 7.5 | 8.0 | 8.8 |
Estimated Value
Limited DataEstimated Cost of Ownership
Based on 39.73ft LOA. Actual costs vary by condition, usage, and local rates.
Articles & Reviews
Known Issues & Pre-Purchase Inspection
18 reported issues across 9 systems for the KING 40, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a KING 40? 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 18 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 KING 40?
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Brands sometimes mentioned for this model: Yanmar, Westerbeke, Bukh — is it one of these?
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Used sails that fit the KING 40
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