Formula 18 vs Geary 18
How do the Formula 18 and Geary 18 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
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Formula 18 
Geary 18 | Formula 18 | Geary 18 | |
|---|---|---|
| Length overall | 18.1 ft5.52 m | 18.2 ft5.54 m |
| Waterline length | —— | —— |
| Beam | 8.5 ft2.60 m | 5.5 ft1.66 m |
| Draft | 4.6 ft1.40 m | 3.8 ft1.14 m |
| Displacement | 397 lb180 kg | 525 lb238 kg |
| Ballast | —— | —— |
| Sail area | 229 ft²21.3 m² | 200 ft²18.6 m² |
| SA / Displacement | 67.83 | 49.17 |
| Displacement / Length | — | — |
| Comfort ratio | — | — |
| Capsize screening | 4.64 | 2.71 |
| Hull speed (kn) | — | — |
Formula 18 vs Geary 18: the short version
- The Formula 18 and Geary 18 are close in length (18.1 ft5.52 m vs 18.2 ft5.54 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 Formula 18 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.