JUPITER 30
Specifications
Hull
| LOA | 29.4 ft |
| LWL | 24.7 ft |
| Beam | 10.4 ft |
| Draft | 5.7 ft |
| Displacement | 7,480 lb |
| Ballast | 2,998 lb |
| Hull speed1.34·√LWL | 6.7 kn |
Rig & Sails
| Iforetriangle height | 37.3 ft |
| Jforetriangle base | 12 ft |
| Pmainsail luff | 33.3 ft |
| Emainsail foot | 10.1 ft |
| FLforestay | 12 ft |
| Mainsail | 405.4 sq ft |
| Jib (100%) | 223.8 sq ft |
| Spinnaker | 380.5 sq ft |
About the JUPITER 30
The Jupiter 30 is a 29.4 ft masthead sloop designed by E. G. van de Stadt and built by Jupiter Yachts, with production records indicating a build year of 1982. While the exact total hull count is unspecified in available data, the vessel is characterized by a displacement of 7480.0 lb and a beam of 10.4 ft.
- Best for:
- This boat suits coastal cruisers and weekend sailors who prioritize a comfortable, stable platform with a moderate comfort ratio of 19.57. Its manageable size and fin keel configuration make it accessible for couples or small families seeking a reliable daysailer with overnight capability.
- Bluewater capability:
- With a low capsize ratio of 2.13 and a displacement/length ratio of 221.6, the Jupiter 30 offers moderate offshore stability, though its single build year and limited bluewater history suggest it is better suited for protected coastal waters than extended ocean passages.
- Comparables:
- Comparable vessels from this era include the Cal 30 and O'Day 302, which share similar beam dimensions and displacement ranges. These boats are comparable due to their shared role as popular, production-oriented cruising sloops with fin keels and masthead rigs.
Performance
ORC Performance Data(3 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° | 4.3 | 5.1 | 5.7 | 6.1 | 6.3 | 6.4 | 6.5 |
| 60° | 4.6 | 5.4 | 6.0 | 6.3 | 6.5 | 6.6 | 6.7 |
| 75° | 4.8 | 5.7 | 6.2 | 6.5 | 6.7 | 6.8 | 7.1 |
| 90° | 4.8 | 5.7 | 6.2 | 6.5 | 6.7 | 6.9 | 7.3 |
| 110° | 4.3 | 5.2 | 5.9 | 6.3 | 6.6 | 6.8 | 7.3 |
| 120° | 4.1 | 4.9 | 5.7 | 6.2 | 6.5 | 6.7 | 7.2 |
| 135° | 3.6 | 4.5 | 5.2 | 5.9 | 6.3 | 6.5 | 7.0 |
| 150° | 3.0 | 3.9 | 4.7 | 5.3 | 5.9 | 6.3 | 6.7 |
| Beat VMG | 2.8 | 3.3 | 3.7 | 4.1 | 4.3 | 4.5 | 4.5 |
| Run VMG | 2.7 | 3.5 | 4.2 | 4.9 | 5.5 | 6.0 | 6.5 |
Estimated Value
Limited DataAsking price by model year
5 listings · boat years 1980–2019 · median $16,446
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 29.4ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
5 reported issues across 4 systems for the JUPITER 30, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a JUPITER 30? 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 JUPITER 30?
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Brands sometimes mentioned for this model: Yanmar — is it one of these?
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Used sails that fit the JUPITER 30
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