Irwin 31 - Sailboat Data & Rig Dimensions
| Rig Dimensions | Imperial | Metric |
|---|---|---|
| I | 37.00 | 11.28 |
| J | 12.10 | 3.69 |
| P | 32.00 | 9.75 |
| E | 14.00 | 4.27 |
| PY | - | - |
| EY | - | - |
| ISP | 37.00 | 11.28 |
| JSP | 12.10 | 3.69 |
| Description | Imperial | Metric |
|---|---|---|
| Forestay Length | 12.1 | 3.7 |
| Sail Areas | Imperial | Metric |
|---|---|---|
| 100% Jib Sail Area | 223.9 | 20.8 |
| Mainsail Area (Cruising) | 241.9 | 22.5 |
| 100% Jib + Main Sail Area | 465.8 | 43.3 |
| Cruising Spinnaker Sail Area (1.7) | 380.5 | 35.4 |
| Dimensions | Imperial | Metric |
|---|---|---|
| LOA | 31.1 | 9.5 |
| LWL | 22.3 | 6.8 |
| Beam | 9.6 | 2.9 |
| Draft | 3.3 | 1.0 |
| Displacement | 9600 lbs. | 4355 kgs. |
| Ballast | 3800 lbs. | 1724 kgs. |
| Ratios | Imperial | Metric |
|---|---|---|
| Sail Area / Displac. | 0.05 | 0.01 |
| Ballast / Displac. | 0.4 | 0.4 |
| Displac. / LOA | 308.68 | 458.42 |
| Construction | Information |
|---|---|
| Hull Type | Keel/Cbrd. |
| Rig Type | Masthead Sloop |
| Designer | Ted Irwin |
| Builder | Irwin Yachts (USA) |
| Construction | FG w/balsa cored deck |
| Ballast Type | Lead |
| First Build | 1968 |
| Last Build | N/A |
| # Built | N/A |