Design and Construction
Rethana Yachts built the hull and deck in solid fiberglass rather than cored laminate. The underbody combines a monohull keel with a centerboard. This arrangement gives the boat a shoal draft of 2.30 feet with the board raised and a maximum draft of 3.94 feet with it fully lowered. She was built in fiberglass by Rethana Yachts beginning in 1979.
The ballast-to-displacement ratio is 38.66 percent, while the displacement-length ratio is 144.45. These figures describe a hull that is slender for its length and firmly weighted for a 24.93-foot boat. Her waterline length is 22.31 feet, supporting a theoretical hull speed of 6.33 knots.
Rig and Handling
The masthead sloop rig carries 269 square feet of sail on a 100 percent basis. That produces a sail-area-to-displacement ratio of 18.40, marking the Rethana 25 as a good performer within the light-displacement class.
Reviewers describe the boat as stable or stiff, but the same assessment notes low righting capability if she capsizes. That is a trade-off typical of a light daysailer with a modest 8.20-foot beam. A capsize screening value of 2.14 and a comfort ratio of 14.58 reinforce the picture of a boat intended for sheltered-water sailing and easy short-handed use rather than offshore passages.
Accommodations and Equipment
The specifications list no cabins, berths, heads, water capacity, or standing headroom. The Rethana 25 is therefore best suited to daysailing. The lack of interior accommodation figures is consistent with her brief as an open-plan small sailer intended for outings rather than overnight cruising.
The single engine listed has zero horsepower and zero fuel capacity, reflecting the day-boat specification. The engine installation is otherwise described only as a single-engine arrangement of unspecified make.
Ownership Considerations
Ownership centers on a simple solid-fiberglass hull with a centerboard trunk. The light displacement and flexible shoal draft suit the boat’s daysailing role. However, owners should respect her reported low righting capability after a capsize, particularly when sailing in a breeze.
The Verdict
The Rethana 25 is a purpose-built German daysailer: light, stiff, and quick under a masthead rig. Her centerboard opens cruising grounds that would be inaccessible to a fixed-keel 25-footer with a deeper draft.
She isn’t an overnight cruiser, and her righting behavior calls for respectful seamanship. Within her intended daysailing role, however, she is a coherent, well-balanced design.
Pros
- Light, good-performing masthead sloop with an 18.40 sail-area-to-displacement ratio
- Centerboard underbody provides a 2.30-foot shoal draft and a 3.94-foot maximum draft
- Solid-fiberglass construction from a defined German production run beginning in 1979
Cons
- Low righting capability if capsized
- No cabin, berth, head, or water capacity; intended for daysailing only
