S2 7.9
Specifications
Hull
| LOA | 25.92 ft |
| LWL | 21.67 ft |
| Beam | 9 ft |
| Draft | 5 ft/ 1.12 ft min |
| Displacement | 4,250 lb |
| Ballast | 1,674.9 lb |
| Hull speed1.34·√LWL | 6.2 kn |
Rig & Sails
| Iforetriangle height | 30.5 ft |
| Jforetriangle base | 9.5 ft |
| Pmainsail luff | 29.42 ft |
| Emainsail foot | 12.25 ft |
| FLforestay | 9.5 ft |
| Mainsail | 180 sq ft |
| Jib (100%) | 149 sq ft |
| Spinnaker | 246.3 sq ft |
About the S2 7.9
AKA the Grand Slam 7.9 Sail area: -Main: 180 ft² / 16.72 m² -Jib: 149 ft² / 13.84 m² A few (17) were delivered with a fixed keel and masthead rig. (See S2 7.9FK for specs.) Inboard power available as an option... BMW 7.5 hp diesel.
Direct variant of the S2 7.9
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(1 certificate)
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 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 20 | 24 |
|---|---|---|---|---|---|---|---|---|---|
| 52° | 3.6 | 4.8 | 5.5 | 6.0 | 6.2 | 6.4 | 6.4 | 6.5 | 6.5 |
| 60° | 3.8 | 5.0 | 5.7 | 6.1 | 6.3 | 6.5 | 6.6 | 6.7 | 6.7 |
| 75° | 4.0 | 5.1 | 5.8 | 6.2 | 6.4 | 6.7 | 6.9 | 7.1 | 7.2 |
| 90° | 3.9 | 5.1 | 5.8 | 6.2 | 6.6 | 6.8 | 7.0 | 7.4 | 7.6 |
| 110° | 3.7 | 4.9 | 5.8 | 6.3 | 6.6 | 7.0 | 7.3 | 7.9 | 8.3 |
| 120° | 3.5 | 4.8 | 5.7 | 6.2 | 6.5 | 6.9 | 7.2 | 8.0 | 9.0 |
| 135° | 3.2 | 4.3 | 5.3 | 5.9 | 6.3 | 6.7 | 7.0 | 7.7 | 8.8 |
| 150° | 2.6 | 3.7 | 4.7 | 5.5 | 6.0 | 6.4 | 6.7 | 7.4 | 8.1 |
| Beat VMG | 2.4 | 3.2 | 3.8 | 4.2 | 4.5 | 4.6 | 4.7 | 4.6 | 4.5 |
| Run VMG | 2.3 | 3.2 | 4.1 | 4.8 | 5.5 | 5.9 | 6.3 | 6.9 | 7.5 |
Estimated Value
Medium ConfidenceAsking price by model year
13 listings · boat years 1977–1994 · median $10,500
Each dot is one listing · hover for details · dashed red line marks the median · obvious data-entry outliers (top & bottom 2.5%) excluded.
Estimated Cost of Ownership
Based on 25.92ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
5 reported issues across 5 systems for the S2 7.9, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a S2 7.9? 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 5 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 S2 7.9?
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.
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Used sails that fit the S2 7.9
Checking eBay for sails sized to this boat's rig…