G-Cat 5.7
| Development | |
|---|---|
| Designer | Hans Geissler | 
| Location | United States | 
| Year | 1980 | 
| Builder(s) | G-Cat Multihulls | 
| Role | One-design racer | 
| Name | G-Cat 5.7 | 
| Boat | |
| Crew | two | 
| Displacement | 360 lb (163 kg) | 
| Hull | |
| Type | Catamaran | 
| Construction | Fiberglass | 
| LOA | 18.67 ft (5.69 m) | 
| LWL | 17.50 ft (5.33 m) | 
| Beam | 8.00 ft (2.44 m) | 
| Hull appendages | |
| Keel/board type | none | 
| Rudder(s) | transom-mounted rudder | 
| Rig | |
| Rig type | Bermuda rig | 
| Sails | |
| Sailplan | Fractional rigged sloop | 
| Total sail area | 235 sq ft (21.8 m2) | 
| 
 | |
The G-Cat 5.7 is an American catamaran sailing dinghy that was designed by Hans Geissler as a one-design racer and first built in 1980.
The G-Cat 5.7 design was developed from the two-foot shorter 1976 G-Cat 5.0.