G-CAT 5.7
Specifications
Hull
| LOA | 18.67 ft |
| LWL | 17.5 ft |
| Beam | 8 ft |
| Displacement | 360 lb |
| Hull speed1.34·√LWL | 5.6 kn |
About the G-CAT 5.7
Designed by Hans Geissler and built by G-Cat (USA) in 1980, the G-Cat 5.7 is a lightweight, high-performance catamaran with a displacement of 360.0 lb. With a build count of ? hulls, this model represents an early entry in the recreational catamaran market, characterized by its fractional sloop rig with a rotating spar.
- Best for:
- This boat is best suited for coastal cruising and daysailing where performance and ease of handling are prioritized over heavy offshore endurance. Its light displacement and high sail area-to-displacement ratio (74.39) make it ideal for experienced sailors seeking speed in moderate conditions.
- Bluewater capability:
- With a low comfort ratio of 1.95 and a capsize ratio of 4.5, the G-Cat 5.7 is not designed for serious bluewater passagemaking and is better restricted to protected coastal waters due to its light displacement and narrow beam relative to length.
- Comparables:
- Comparable boats from this era include other early 1980s recreational catamarans such as the Lagoon 28 or Beneteh First Class 7.5, which share similar fractional sloop rigs and focus on planing performance rather than heavy displacement cruising.
Performance
Pricing
We don't have market pricing data for the G-CAT 5.7 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 18.67ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
2 reported issues across 2 systems for the G-CAT 5.7, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a G-CAT 5.7? 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 2 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 G-CAT 5.7?
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.
Already know your engine? Search all engines → to find its exact parts.
Used sails that fit the G-CAT 5.7
Checking eBay for sails sized to this boat's rig…