1979 Irwin 25 vs Catalina 315 — Comparison
1979 Irwin 25
Catalina 315
Specifications Side by Side
| Specification | 1979 Irwin 25 | Catalina 315 |
|---|---|---|
| General | ||
| Manufacturer | Irwin | Catalina |
| Year | 1979–1984 | 2014 |
| Type | Sloop | Sloop |
| Country | USA | USA |
| Designer | Ted Irwin | Gerry Douglas |
| Dimensions | ||
| LOA | 7.62 m (25.0 ft) | 9.45 m (31.0 ft) |
| LWL | 6.10 m (20.0 ft) | 8.61 m (28.2 ft) |
| Beam | 2.59 m (8.5 ft) | 3.20 m (10.5 ft) |
| Draft | 1.14 m (3.7 ft) | 1.68 m (5.5 ft) |
| Weight | ||
| Displacement | 2,041 kg (4,500 lbs) | 4,536 kg (10,000 lbs) |
| Ballast | 816 kg (1,799 lbs) | 1,814 kg (3,999 lbs) |
| Sailing | ||
| Sail Area | 25.8 m² (278 ft²) | 44.0 m² (474 ft²) |
| Hull Material | Fiberglass | Fiberglass |
| Keel Type | Fin | Fin |
| Engine & Tanks | ||
| Engine | 10 HP | 21 HP |
| Fuel Capacity | 30 L (7.9 gal) | 76 L (20.1 gal) |
| Water Capacity | 38 L (10.0 gal) | 132 L (34.9 gal) |
| Accommodation | ||
| Berths | 5 | 5 |
| Cabins | 1 | 1 |
Performance Comparison
Detailed Comparison
The 1979 Irwin 25 and Catalina 315 represent two takes on sloop-rigged sailing. The 1979 Irwin 25 is a 1970s design by Irwin from USA, while the Catalina 315 is a modern offering from Catalina from USA. The 1979 Irwin 25 was penned by Ted Irwin. The Catalina 315 was designed by Gerry Douglas.
In terms of size, the 1979 Irwin 25 measures 7.62m (25.0ft) overall with a beam of 2.59m, compared to the Catalina 315 at 9.45m (31.0ft) with a 3.20m beam. The Catalina 315 is 1.83m longer than the 1979 Irwin 25. The Catalina 315 displaces approximately 122% more than its counterpart, which significantly affects how each boat handles in different sea states.
Looking at performance, the 1979 Irwin 25 has moderate sail power suitable for relaxed cruising with an SA/D ratio of 16.30 and 25.8 m² of sail area. The Catalina 315, with an SA/D of 16.32 and 44.0 m² of canvas, offers moderate sail power suitable for relaxed cruising. The Catalina 315 has the edge in terms of raw sailing performance.
For comfort and safety, the 1979 Irwin 25 offers a moderate motion comfort level (comfort ratio: 20.6) and excellent capsize resistance suitable for offshore voyaging (capsize ratio: 0.82). The Catalina 315 has a comfort ratio of 18.9 and a capsize screening value of 0.77. The ballast ratios are 40.0% for the 1979 Irwin 25 and 40.0% for the Catalina 315, reflecting their respective approaches to stability.
Below deck, the 1979 Irwin 25 provides 5 berths in 1 cabin with 38L of water capacity and 30L of fuel. The Catalina 315 offers 5 berths in 1 cabin with 132L water and 76L fuel capacity.
Verdict
For cruising: The 1979 Irwin 25 is the better choice for comfortable cruising thanks to its higher comfort ratio, offering a gentler motion at sea that crews will appreciate on longer passages.
For racing: The Catalina 315 has the performance advantage with its superior SA/D ratio, meaning more sail power relative to its displacement for competitive sailing.
For liveaboard: Both boats provide similar accommodation, making either a viable choice for living aboard. Consider water and fuel capacity for extended stays away from marinas.
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Or view individual specs: 1979 Irwin 25 · Catalina 315