Cumulus 28 vs RJ 85
How do the Cumulus 28 and RJ 85 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Cumulus 28 | Cumulus 28 | RJ 85 | |
|---|---|---|
| Length overall | 28.1 ft8.56 m | 28.1 ft8.55 m |
| Waterline length | 22.3 ft6.81 m | 22.0 ft6.70 m |
| Beam | 9.3 ft2.82 m | 6.7 ft2.05 m |
| Draft | 5.3 ft1.60 m | 4.1 ft1.26 m |
| Displacement | 7,055 lb3,200 kg | 4,850 lb2,200 kg |
| Ballast | 2,812 lb1,276 kg | 2,646 lb1,200 kg |
| Sail area | 363 ft²33.7 m² | 323 ft²30.0 m² |
| SA / Displacement | 15.79 | 18.04 |
| Displacement / Length | 283 | 204 |
| Comfort ratio | 23.4 | 24.8 |
| Capsize screening | 1.93 | 1.59 |
| Hull speed (kn) | 6.3 | 6.3 |
| Average used price | — | €4,500 |
Cumulus 28 vs RJ 85: the short version
- The Cumulus 28 and RJ 85 are close in length (28.1 ft8.56 m vs 28.1 ft8.55 m ).
- The Cumulus 28 is heavier, displacing about 45% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the RJ 85 carries the more powerful rig (18.0 vs 15.8), favouring lighter-air performance.
- The RJ 85 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the RJ 85 rates better for offshore work (1.59 vs 1.93).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.