ARC-21
Specifications
Hull
| LOA | 21.5 ft |
| LWL | 21.2 ft |
| Beam | 8.5 ft |
| Draft | 4.25 ft/ 2.42 ft min |
| Displacement | 400 lb |
| Hull speed1.34·√LWL | 6.2 kn |
About the ARC-21
The ARC-21 is a lightweight, performance-oriented 21.5 ft fractional sloop designed by Roberts/Haberman and built by Aquarius Sail Inc. in 2000. With a displacement of 400.0 lb and a high sail area-to-displacement ratio of 83.21, it is engineered for speed rather than heavy-weather stability.
- Best for:
- This boat suits coastal cruisers and day sailors who prioritize easy handling and rapid acceleration over heavy-weather comfort. Its light displacement and rotating spar rig make it particularly well-suited for single-handers or couples seeking a low-maintenance, trailerable package.
- Bluewater capability:
- With a capsize ratio of 4.62 and a comfort ratio of 1.68, the ARC-21 is not recommended for extended offshore passages due to its light displacement and reduced motion comfort in heavy seas.
- Comparables:
- Comparable boats include other lightweight trailerable designs from the early 2000s, such as the Catalina 22 or O'Day 23, though the ARC-21 distinguishes itself with its significantly lower displacement of 400.0 lb and modern fractional rig. It shares its role with other Roberts/Haberman designs that emphasize planing capabilities and ease of transport.
Performance
Pricing
We don't have market pricing data for the ARC-21 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 21.5ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
5 reported issues across 4 systems for the ARC-21, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a ARC-21? 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
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Used sails that fit the ARC-21
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