Design and Construction
The Offshore 38 was engineered from the outset for multiple build paths rather than a single factory mold. The round-bilge fiberglass and cold-moulded wood-epoxy plans sit alongside multi-chine steel and aluminum versions, giving the model an unusual breadth of realized hulls available in multiple construction media. A documented steel-hull example confirms that the metal route was not theoretical. With a length-to-beam ratio of 3.37 and a ballast ratio of 43 percent, the hull is moderately narrow for a 38-footer and carries a meaningful ballast fraction. The displacement-length ratio of 161 places her among what one review terms "light racers," a surprising label for a boat with the build flexibility of a cruising offshore design.
Rig and Handling
Roberts offered the Offshore 38 with more than one rig, and the two documented options are a masthead sloop and a ketch. Both share identical sheet specifications: jib and genoa sheets of 11.6 meters with 14 mm diameter, a 28.9 meter mainsheet also at 14 mm, and spinnaker sheets of 25.4 meters at the same 14 mm size consistent across both rigs. The commonality suggests the deck plan was laid out to accept either rig without re-engineering the winch leads. The capsize screening value of 1.81 indicates the boat could, by that formula alone, be accepted to participate in ocean races, while a Motion Comfort Ratio of 26.3 and a sink rate near 1,373 pounds per inch describe a hull that settles predictably under load. The wetted surface of roughly 441 square feet and the SA/D ratio of 13.61 frame a moderate underbody with conservative sail area relative to displacement.
Performance Under Power
The design has been equipped with different engine alternatives, and the installations include a Yanmar 3QM30 and a Perkins 4.108, each driving a shaft drive transmission. With the Yanmar, cruise speed is 6.0 knots and max speed is 7.0 knots; the Perkins installation shows a calculated max speed of about 7.9 knots, which matches the theoretical maximum of a displacement hull of this length matching the displacement hull limit. The figures show the boat is no slug under power but is bounded by her displacement, as expected for a 38-foot offshore hull.
Accommodations
Headroom on the Offshore 38 is above average for the class, a useful attribute for a boat intended for extended liveaboard or ocean-passage use. The above-average standing room combined with the cruising-oriented rig options suggests a hull with interior volume suited to passage life rather than racing weight control.
The Verdict
The Bruce Roberts Offshore 38 is a genuinely versatile offshore design whose principal strength is its multi-material plan heritage under a single Bruce Roberts name. She rewards a buyer or builder who knows which construction path suits his cruising, and her documented rig and engine options show a boat conceived for real passage work rather than showroom uniformity.
Pros
- Offered in fiberglass, wood-epoxy, steel, and aluminum plans available in multiple construction media
- Masthead sloop or ketch rig options with shared sheet geometry
- Above-average headroom for the size
- Capsize screening value supports ocean-race acceptance by formula
Cons
- Displacement-length ratio of 161 labels her a "light racer," which may mislead cruiser buyers
- SA/D of 13.61 is conservative, implying modest light-air sail drive
- Interior layout beyond headroom is not described
