Design and Construction
The Maxi 77 is built with a solid fiberglass hull and deck, and its interior is, like most other boats of the period, made of teak. The keel is iron, and the design was offered with different keel alternatives — fin keels with drafts ranging from about 3.77 feet under light load to as much as 5.06 feet when loaded, depending on the specific option chosen. The shallowest variant keeps the boat able to enter even shallow marinas, while the deepest approaches a meter and a half of draft. A notable construction detail is the use of balsa wood as sandwich core material, which requires special care to prevent water contact during any penetration of the sandwich sandwich core material special care must be taken to avoid rot. The boat's length-to-beam ratio is 3.04 and its displacement-length ratio is 190, categorizing it among moderate racers rather than heavy-displacement cruisers.
Rig and Handling
The Maxi 77 is built with a masthead rig and is significantly overrigged compared to similar sailboats, carrying more rig than 86% of all comparable designs. That sail plan drives a sail-area-to-displacement ratio of 14.8 with the ISO 8666 reference sail, rising to 18.1 with a 135% genoa. Under way, the theoretical maximum hull speed is 6.3 knots and the calculated maximum speed under power is about 4.2 knots. The capsize screening value is 1.95, a figure that by that formula alone would permit the boat to be accepted to participate in ocean races. The Motion Comfort Ratio spans 17.7 to 19.5, and the Relative Speed Performance is rated at 62. The wet bottom surface area is about 204 square feet, and the immersion rate is approximately 635 pounds per inch.
Accommodations
Below, the Maxi 77 follows the period norm with a teak interior. The documented facts give no layout dimensions beyond the hull's 25.26-foot length overall and 8.2-foot beam, but the modest beam-to-length proportion and the moderate-displacement hull suggest a concentrated interior volume typical of a 1970s Scandinavian pocket cruiser. The boat's documented character is that of a small, reasonably quick coastal cruiser rather than a volume-maximized weekender.
Known Issues
The principal documented vulnerability is the balsa-cored sandwich construction, where any through-deck or through-hull penetration that breaches the core and admits water can invite rot if not properly sealed. This is the only specific defect pathway recorded for the design. Otherwise, the sources note no structural or systems failures beyond the ordinary considerations implied by a 1970s fiberglass build and an iron keel.
Refits and Ownership
Owners working on a Maxi 77 should plan any deck hardware additions or replacements around the balsa core, isolating penetrations from moisture. The overrigged masthead plan means standing and running rigging should be inspected to period-load standards.
The Verdict
The Maxi 77 is a Petterson-designed small cruiser that punches above its size in sail carrying, with a documented moderate-racer displacement profile and a keel-choice flexibility that broadens its cruising range. Its balsa sandwich is the one clear ownership caveat.
Pros
- Designed by Pelle Petterson and built in quantity by his Swedish yard
- Three fin-keel draft options from 3.77 to 5.06 feet
- Significantly overrigged masthead rig with SA/D up to 18.1
- Capsize screening value of 1.95; moderate-racer D/L of 190
Cons
- Balsa wood sandwich core demands careful sealing at all penetrations to avoid rot
- Shallow-draft variants limit upwind capability versus the deepest keel
