Rock 20 - Sailboat Data & Rig Dimensions
| Rig Dimensions | Imperial | Metric |
|---|---|---|
| I | 25.60 | 7.80 |
| J | 9.02 | 2.75 |
| P | 23.23 | 7.08 |
| E | 8.73 | 2.66 |
| PY | - | - |
| EY | - | - |
| ISP | 25.60 | 7.80 |
| JSP | 9.02 | 2.75 |
| Description | Imperial | Metric |
|---|---|---|
| Forestay Length | 9 | 2.7 |
| Sail Areas | Imperial | Metric |
|---|---|---|
| 100% Jib Sail Area | 115.5 | 10.7 |
| Mainsail Area (Cruising) | 109.5 | 10.2 |
| 100% Jib + Main Sail Area | 225 | 20.9 |
| Cruising Spinnaker Sail Area (1.7) | 196.3 | 18.3 |
| Dimensions | Imperial | Metric |
|---|---|---|
| LOA | 23.5 | 7.2 |
| LWL | 19.5 | 6.0 |
| Beam | 7.4 | 2.3 |
| Draft | N/A | N/A |
| Displacement | 3858 lbs. | 1750 kgs. |
| Ballast | 1323 lbs. | 600 kgs. |
| Ratios | Imperial | Metric |
|---|---|---|
| Sail Area / Displac. | 0.06 | 0.01 |
| Ballast / Displac. | 0.34 | 0.34 |
| Displac. / LOA | 164.17 | 243.06 |
| Construction | Information |
|---|---|
| Hull Type | Fin with rudder on skeg |
| Rig Type | Masthead Sloop |
| Designer | Heinz-Jurgen Sass |
| Builder | Birka Marine (FIN) |
| Construction | FG |
| Ballast Type | Iron |
| First Build | 1968 |
| Last Build | 1975 |
| # Built | 200 |