Aquarius 21 vs Impulse 21
How do the Aquarius 21 and Impulse 21 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Aquarius 21 | Aquarius 21 | Impulse 21 | |
|---|---|---|
| Length overall | 21.0 ft6.40 m | 21.0 ft6.40 m |
| Waterline length | 18.3 ft5.56 m | 18.5 ft5.64 m |
| Beam | 7.8 ft2.38 m | 8.0 ft2.44 m |
| Draft | 4.5 ft1.37 m | 3.3 ft0.99 m |
| Displacement | 1,900 lb862 kg | 1,300 lb590 kg |
| Ballast | 665 lb302 kg | 600 lb272 kg |
| Sail area | 163 ft²15.1 m² | 207 ft²19.2 m² |
| SA / Displacement | 17.00 | 27.81 |
| Displacement / Length | 140 | 92 |
| Comfort ratio | 9.9 | 6.5 |
| Capsize screening | 2.53 | 2.93 |
| Hull speed (kn) | 5.7 | 5.8 |
Aquarius 21 vs Impulse 21: the short version
- The Aquarius 21 and Impulse 21 are close in length (21.0 ft6.40 m vs 21.0 ft6.40 m ).
- The Aquarius 21 is heavier, displacing about 46% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Impulse 21 carries the more powerful rig (27.8 vs 17.0), favouring lighter-air performance.
- The Aquarius 21 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Aquarius 21 rates better for offshore work (2.53 vs 2.93).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.