Design and Construction
David Sadler drew the Sadler 25 Mk III in the late seventies, and Sadler Yachts built her in fiberglass with a solid hull. The keel is a fin keel, and the boat carries about 1,900 pounds of lead ballast against a 4,000-pound displacement, a 48 percent ballast ratio that sits higher than 85 percent of comparable sailboat designs. With a beam of 8.75 feet on a 24.33-foot length overall, her length-to-beam ratio of 2.78 makes her roomier than 73 percent of all other designs of the type. The wetted surface runs about 193 square feet, and the immersion rate is 585 pounds per inch, telling you how she sits to her load.
Rig and Handling
The Mk III is a masthead sloop carrying 265 square feet of mainsail and jib. Her sail-area-to-displacement ratio is 16.9 on the ISO reference sail and rises to 20.3 with a 135 percent genoa, which places her ahead of half of similar designs in light wind. She is, however, slightly underrigged next to the fleet — she carries more rig than only 38 percent of similar sailboats. Halyards and sheets follow predictable sizes for the class: mainsail and genoa halyards run 70 feet at 5/16 inch, jib and genoa sheets 24.3 feet at 3/8 inch, and the mainsheet 60.9 feet at 3/8 inch. The displacement-length ratio of 254 puts her among "moderate racers," with 34 percent of similar designs heavier than she is.
Performance Profile
Her capsize screening value is 2.21, a figure that would bar her from ocean-race acceptance, and her theoretical hull speed is 5.9 knots. The Motion Comfort Ratio of 16.5 means she is more comfortable than 46 percent of similar sailboat designs. These numbers sketch a coastal cruiser-racer rather than an offshore campaigner: stiff and well-ballasted for her size, quick enough under genoa in a breeze, but not built to satisfy safety screening for bluewater events.
Accommodations
The beamy hull pays dividends below. The length-to-beam ratio of 2.78 yields an interior more roomy than 73 percent of all other designs in the comparison set, a meaningful distinction in a 24-foot boat where volume is usually at a premium.
The Verdict
The Sadler 25 Mk III is a late-seventies David Sadler design that trades offshore credentialing for a stiff, beamy, and comparatively roomy coastal platform. Her ballast-heavy hull and genoa-driven light-air speed are real strengths; her capsize screen and underrigged masthead plan are the limits.
Pros
- Ballast ratio higher than 85 percent of similar designs
- More roomy than 73 percent of comparable designs by L/B ratio
- Faster than 50 percent of similar boats in light wind with a 135% genoa
Cons
- Capsize screening value of 2.21 excludes her from ocean races
- Slightly underrigged versus 62 percent of similar sailboats
- Motion Comfort Ratio better than only 46 percent of peers
