Aquadyne Boat Co. (USA)
Sailbird 18 (Tri) Specifications
Main Specs
| Length, m | 5.49 |
| Beam, m | 3.51 |
| Draft, m | 0.76 |
| Displacement, kg | 181.00 |
Classification
| Hull Type | Trimaran Cbrd. |
| Hull Material | FG |
Rigging and Keel
| Rig | Fractional Sloop |
| Max Draft, m | 0.76 |
| Min Draft, m | 0.15 |
Manufacturer Information
| Shipyard | Aquadyne Boat Co. (USA) |
| # Built | 700 |
| Designer | Arthur Berry |
| Association | groups.io/g/OfficialAquadyneSailbirdGroup |
| Period of manufacturing | 1974 - 1978 |
Technical Specs
| LOA, m | 5.49 |
| Sail Area (S.A.), m² | 17.19 |
Sailboat Calculations
S.A. / Displacement Formula
SA/D = SA (ft²) ÷ [Disp (lbs) / 64]^0.666
A sail area/displacement ratio below 16 would be considered under powered; 16 to 20 would indicate reasonably good performance; above 20 suggests relatively high performance.
SA/D = SA (ft²) ÷ [Disp (lbs) / 64]^0.666
A sail area/displacement ratio below 16 would be considered under powered; 16 to 20 would indicate reasonably good performance; above 20 suggests relatively high performance.
Capsize Screening Formula
CSF = Beam ÷ (Disp in cubic ft)^(1/3)
Designed to determine if a boat has blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability. The boat is better suited for ocean passages (vs coastal cruising) if the result of the calculation is 2.0 or less. The lower the better.
CSF = Beam ÷ (Disp in cubic ft)^(1/3)
Designed to determine if a boat has blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability. The boat is better suited for ocean passages (vs coastal cruising) if the result of the calculation is 2.0 or less. The lower the better.
| S.A. / Displacement | 54.69 |
| Capsize Screening Formula | 6.26 |
