Viper 640 - Sailboat Data & Rig Dimensions
| Rig Dimensions | Imperial | Metric |
|---|---|---|
| I | 21.98 | 6.70 |
| J | 7.48 | 2.28 |
| P | 25.62 | 7.81 |
| E | 10.07 | 3.07 |
| PY | - | - |
| EY | - | - |
| ISP | 21.98 | 6.70 |
| JSP | 7.48 | 2.28 |
| Description | Imperial | Metric |
|---|---|---|
| Forestay Length | 7.5 | 2.3 |
| Sail Areas | Imperial | Metric |
|---|---|---|
| 100% Jib Sail Area | 82.2 | 7.6 |
| Mainsail Area (Cruising) | 139.3 | 12.9 |
| 100% Jib + Main Sail Area | 221.5 | 20.6 |
| Cruising Spinnaker Sail Area (1.7) | 139.7 | 13.1 |
| Dimensions | Imperial | Metric |
|---|---|---|
| LOA | 21.1 | 6.4 |
| LWL | 19.1 | 5.8 |
| Beam | 8.2 | 2.5 |
| Draft | 1.8 | 0.6 |
| Displacement | 750 lbs. | 340 kgs. |
| Ballast | 262 lbs. | 119 kgs. |
| Ratios | Imperial | Metric |
|---|---|---|
| Sail Area / Displac. | 0.3 | 0.06 |
| Ballast / Displac. | 0.35 | 0.35 |
| Displac. / LOA | 35.55 | 53.13 |
| Construction | Information |
|---|---|
| Hull Type | Lifting Keel |
| Rig Type | Fractional Sloop |
| Designer | Brian Bennett |
| Builder | Viper Boats (USA)/Rondar (UK) |
| Construction | FG |
| Ballast Type | N/A |
| First Build | 1996 |
| Last Build | N/A |
| # Built | 400 |