Alpa 21 - Sailboat Data & Rig Dimensions
| Rig Dimensions | Imperial | Metric |
|---|---|---|
| I | 30.00 | 9.14 |
| J | 8.55 | 2.61 |
| P | 26.00 | 7.92 |
| E | 9.00 | 2.74 |
| PY | - | - |
| EY | - | - |
| ISP | 30.00 | 9.14 |
| JSP | 8.55 | 2.61 |
| Description | Imperial | Metric |
|---|---|---|
| Forestay Length | 8.6 | 2.6 |
| Sail Areas | Imperial | Metric |
|---|---|---|
| 100% Jib Sail Area | 128.3 | 11.9 |
| Mainsail Area (Cruising) | 126.4 | 11.7 |
| 100% Jib + Main Sail Area | 254.6 | 23.6 |
| Cruising Spinnaker Sail Area (1.7) | 218 | 20.3 |
| Dimensions | Imperial | Metric |
|---|---|---|
| LOA | 21.3 | 6.5 |
| LWL | 18.6 | 5.7 |
| Beam | 8.2 | 2.5 |
| Draft | N/A | N/A |
| Displacement | 2868 lbs. | 1301 kgs. |
| Ballast | 800 lbs. | 363 kgs. |
| Ratios | Imperial | Metric |
|---|---|---|
| Sail Area / Displac. | 0.09 | 0.02 |
| Ballast / Displac. | 0.28 | 0.28 |
| Displac. / LOA | 134.65 | 200.15 |
| Construction | Information |
|---|---|
| Hull Type | Fin w/transom hung rudder |
| Rig Type | Masthead Sloop |
| Designer | Sparkman & Stephens |
| Builder | Alpa (ITA) |
| Construction | FG |
| Ballast Type | N/A |
| First Build | 1976 |
| Last Build | N/A |
| # Built | N/A |