Polymarin of Amsterdam and Halmatic in the UK carried out the molding. Stangate Marine in Littlehampton handled international sales and final outfitting for part of the fleet. Roughly one hundred yachts were completed in the Netherlands before production ended in 1981, followed by a short British production run of a large-rig version.
The design draws directly on North Sea trawler lines. Its high, powerful bow and long-keeled hull led period reviewers to conclude that it could battle through heavy conditions.
Design and Construction
The trawler-derived hull is broad and substantial. The Banjer 37 measures 36 ft 6 in overall, with an 11 ft 6 in beam and a 33 ft waterline. Displacement is about 26,880 lb, and the wetted surface is approximately 398 ft².
The long keel draws just 4 ft 7 in, shallow enough for the boat to tuck into modest marinas. Built under Lloyd’s rules, the solid GRP hull carries a minimum 0.5-inch thickness. Period reviews rated the build quality as excellent.
With a displacement-length ratio near 314, the Banjer sits firmly in the heavy-cruiser class. It carries around 8,800 lb of iron ballast, giving a ballast ratio of roughly 33 percent and a comfort ratio in the mid-40s. The result is a sedate, steady platform rather than a lively racer.
Rig, Engine, and Performance
The standard Banjer 37 is a ketch carrying about 450 sq ft of sail. Period testers considered this small rig better suited to a motorboat with sails than to a sailing yacht. A large-rig Bermudian option nearly doubled the sail area to 805 sq ft, shifting the balance closer to that of a 50/50 motorsailer. The sail-area-to-displacement ratio is 9.46, confirming the modest amount of canvas.
The sheet specifications are uniform. Jib and genoa sheets are 36.5 ft long and 14 mm in diameter. The mainsheet is 91.3 ft, while the spinnaker gear is 80.3 ft; both are also 14 mm in diameter.
Engine records vary from boat to boat. Listed installations include an 85 hp DAF diesel, a 72 hp Perkins 4-236, and, elsewhere in the records, a 120 hp unit. Theoretical hull speed is 7.8 knots, with a measured maximum near 8.0 knots.
Seakeeping and Stability
The stability figures suggest a forgiving boat for offshore use. The capsize screening value is 1.53, the calculated angle of vanishing stability is about 65 degrees, and the motion comfort ratio reaches 46.1.
The immersion rate is steep at roughly 1,333 lb per inch, reflecting the hull’s considerable mass. Together with the trawler bow and long keel, these figures help explain why reviewers felt the GRP hull could battle through anything the North Sea might offer.
Accommodations
Below, the Banjer 37 is finished in teak and sleeps up to seven in berths arranged for cruising. The beamy hull provides substantial interior volume, while the motorsailer profile allows standing headroom and a saloon suited to extended living aboard.
Its shallow draft and heavy displacement also make it a stable household at anchor.
Verdict
The Banjer 37 is a purpose-built motorsailer with clear trawler heritage. It is heavily built, shallow-drafted, and stable, with a teak interior that can accommodate a family or charter crew. It’s no light-air sprinter, but its construction and figures suit long-range cruising in rough water.
Pros
- Lloyd’s-specification solid GRP hull with a minimum thickness of 0.5 inches and an excellent period build rating
- Shallow 4 ft 7 in long-keel draft, easing access to modest marinas
- High stability, with an AVS of about 65 degrees and a comfort ratio of 46.1
- Trawler bow suited to heavy conditions
- Teak interior with up to seven berths
Cons
- Standard ketch rig is short on sail area and leaves the boat reliant on its engine
- Recorded engine outputs vary considerably, from 72 hp to 120 hp
- Heavy displacement limits maximum speed to about 8 knots
