San Juan 21
| Length | |
| Hull Type | Swing Keel |
| Rigging Type | Fractional Sloop |
| LOA | 20.50' (6.25m) |
| S.A. | 196.00 sq ft (18.21 m2) |
| Beam | 7.08' (2.16m) |
| Displacement | 1250 lbs / 567 kgs |
| Ballast | 450 lbs / 204 kgs |
| Designer | Don Clark |
| First Built | 1970 |
| Length | |
| Hull Type | Swing Keel |
| Rigging Type | Fractional Sloop |
| LOA | 20.50' (6.25m) |
| S.A. | 196.00 sq ft (18.21 m2) |
| Beam | 7.08' (2.16m) |
| Displacement | 1250 lbs / 567 kgs |
| Ballast | 450 lbs / 204 kgs |
| Designer | Don Clark |
| First Built | 1970 |