Geary 18 vs Nacra F18 Infusion
How do the Geary 18 and Nacra F18 Infusion compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Geary 18 
Nacra F18 Infusion | Geary 18 | Nacra F18 Infusion | |
|---|---|---|
| Length overall | 18.2 ft5.54 m | 18.1 ft5.52 m |
| Waterline length | —— | —— |
| Beam | 5.5 ft1.66 m | 8.5 ft2.60 m |
| Draft | 3.8 ft1.14 m | —— |
| Displacement | 525 lb238 kg | 397 lb180 kg |
| Ballast | —— | —— |
| Sail area | 200 ft²18.6 m² | 229 ft²21.3 m² |
| SA / Displacement | 49.17 | 67.83 |
| Displacement / Length | — | — |
| Comfort ratio | — | — |
| Capsize screening | 2.71 | 4.64 |
| Hull speed (kn) | — | — |
Geary 18 vs Nacra F18 Infusion: the short version
- The Geary 18 and Nacra F18 Infusion are close in length (18.2 ft5.54 m vs 18.1 ft5.52 m ).
- The Geary 18 is heavier, displacing about 32% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Nacra F18 Infusion carries the more powerful rig (67.8 vs 49.2), favouring lighter-air performance.
- By the capsize screening formula the Geary 18 rates better for offshore work (2.71 vs 4.64).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.