Design and Construction
The Zeehond is a true flush-deck yacht, a layout choice that gives it a lot of usable deck area and a distinctive profile. Rather than stretching a long coach-roof for headroom, the hull itself is brought up to a height that provides standing room below without a raised saloon trunk. That compact form, paired with the large area both on and below deck, is what the original design brief celebrated as appealing to many sailors. The hull is made of steel in the surveyed examples, though the design was also offered in aluminum and wood, and the steel version displaces 9.25 tonnes with 3.30 tonnes of ballast, while wood and aluminum versions are lighter at 8.25 tonnes with ballast of 3.60 and 3.50 tonnes respectively. Sources differ on a single aggregated displacement figure. E.G. van de Stadt had by 1976 long since moved past his plywood pioneering phase and into series-production GRP and metal yachts, and the Zeehond reflects a mature cruising design rather than an experimental one.
Rig and Handling
The boat carries a masthead rig, and the sail-plan data show a sloop or cutter configuration with 79 square meters of area, or 82 square meters as a ketch. Compared with similar sailboats, the Zeehond has more rig than only 31 percent of its peers, which marks it as slightly underrigged for its size. The SA/D ratio with the ISO reference sail is 13.4 and rises to 16.2 with a 135 percent genoa, modest numbers consistent with the ultra-heavy-cruiser categorization implied by its DL-ratio of 391. The fin keel draws about 1.90 to 2.00 meters dependent on load, limiting the boat to major marinas. Its theoretical hull speed as a displacement vessel of this length is 7.2 knots, and the Motion Comfort Ratio of 38.8 and capsize screening value of 1.70 place it firmly in the stable, load-carrying cruiser camp rather than the racer spectrum.
Accommodations
Below, the Zeehond offers a roomy interior with a completely separate aft cabin reached safely below deck, a layout feature that distinguishes it from many center-cockpit or open-plan 36-footers of the period. The high freeboard that comes from the raised hull topsides serves a dual purpose: it gives the standing headroom without a long coach-roof and ensures that less water comes on deck in a seaway. Headroom is below average, a trade-off of the flush-deck approach that buyers should weigh against the protected aft cabin and the all-weather deck space above.
Known Issues
The principal practical limitations arise from the design itself: the deep fin keel restricts anchorage options, and the slightly underrigged sail plan means light-air performance will favor patience over pace. The steel hull variant demands vigilance for corrosion.
Refits and Ownership
Because many Zeehonds were built as home-completed or yard-finished projects, the standard of joinery, systems routing, and hull finishing varies widely between individual boats. Original rigging hardware, halyards, and sheet diameters follow the specs — 12 mm halyards and 14 mm sheets — but the condition of those components depends entirely on the builder's execution and later maintenance. The multiple construction materials mean that refit strategy diverges sharply: a steel hull is a welding and coating project, while wood demands moisture management and aluminum calls for isolation care.
The Verdict
The Van de Stadt 36 Zeehond is a thoughtful flush-deck cruiser that trades a low coach-roof silhouette and protected aft cabin for slightly compromised headroom and a deep keel. Its heavy-displacement hull and modest sail area mark it as a stable cruiser rather than a light-air performer, and the variety of construction types plus the home-build legacy make individual history the deciding factor in any assessment.
Pros
- True flush-deck with large deck area and standing headroom from raised hull sides
- Separate aft cabin reached safely below deck
- Offered in steel, aluminum, or wood to suit owner preference
- High freeboard keeps water off the deck
Cons
- Below-average headroom per period review
- Deep fin keel limits marina access
- Slightly underrigged relative to similar sailboats
- Home-completed builds create wide variance in finish quality
