Hull Design and Construction
Humphreys gave the 575 pure hull lines that prioritize passage-making efficiency without sacrificing the interior volume a four-cabin cruiser demands. Robert Perry, reviewing the design at launch, noted the displacement-to-length ratio of 202 — notably lighter than the 230 D/L Perry considers normal for an all-out cruiser — and attributed part of that achievement to Kevlar and carbon laminates in the hull. The Yachting World test agreed, noting the 575 benefits from a composite lay-up using carbon and Kevlar, the same approach applied to the Oyster 54 and 655. Beam is carried aft deliberately to support the large cockpit layout and aft-cabin accommodations, and the hull retains a deep V sea-going bilge that gives the boat her composed motion offshore. The underwater appendages warrant attention: Perry flagged the skeg-hung rudder as unusual in an era of almost universal spade rudders, describing it as a very long and narrow skeg whose construction and support he found worth questioning. Draft with the standard high-performance bulb keel is 8 feet 10 inches, and Oyster also offered a shoal-draft keel drawing 6 feet 8 inches, as well as a centreboard variant.
Rig and Sailing Performance
The 575's rig is designed for shorthanded management on extended passages. A full batten mainsail is standard, with in-mast furling available as an option, and the sail area-to-displacement ratio of 20.8 gives a healthy number for a cruising boat of this type. Double headsail and non-overlapping headsail arrangements are optional, and unfurling the staysail in the Yachting World sea trial engaged an extra gear immediately. Under sail in Force 3 conditions, the 575 reached seven knots close-hauled at around 50 degrees under a 135-percent genoa, responding crisply to additional wind. At her trademark point of sail — a reach — she sits comfortably at nine knots. Slight weatherhelm appeared reassuringly in the teens of wind. The helm itself was described as not particularly communicative, a consequence of the long steering linkage and dual autopilot rams, though the trade-off is relaxed, point-and-go helming well suited to passage-making. Twin wheels give unhindered forward views from both sides, and the boat's motion through waves is famously composed — as well mannered as a royal butler. Nine Oyster 575 owners chose her as their entry for the 2017-19 Oyster World Rally, a credible endorsement of her offshore capability.
Accommodations and Ergonomics
Below decks the center-cockpit arrangement delivers what Oyster has refined over multiple generations: sumptuous aft cabins, large galleys and spacious saloons set low in the hull for privacy and stability. The master cabin aft earned specific praise — hard to beat for headroom, space, light and comfort — though passage sailing revealed the predictable caveat that dock noise, engine noise and heel make the palatial berth less straightforward to sleep in at sea. The galley is a highlight: a wide passageway that allows two people to pass yet provides bracing underway, with high-fiddled Avonite worksurfaces fashioned to prevent lying water, a Force 10 stove, Frigoboat freezer and fridge, and a domestic-sized washer-dryer and chest dishwasher for charter use. Stowage throughout has been maximised wherever possible, an explicit improvement over the earlier Oyster 54. The saloon features a huge port-side dinette and an L-shaped settee to starboard, with a chart table that flows seamlessly into the surrounding joinery after the interior redesign. The 575 can be configured with a crew cabin abaft the navstation, or the space repurposed as a workshop with a lift-up bunk — the best use of that space according to the boat's project manager.
Machinery and Systems
The 575's walk-in engine room is widely cited as a genuine differentiator. Double-insulated using a laminated layer of foam with high-density rubber, it houses the VW TDI engine so quietly that the Yachting World reviewer had to check instruments to confirm the engine was running. The main fuel tank carries three easily viewable inspection hatches, and a second tank under the forward sole brings total fuel capacity to 1,400 liters. All water pumps are located in the saloon sole to keep mechanical noise away from the accommodation. The 480Ah gel domestic battery bank and starter batteries are co-located there. Raw water manifold systems for engine and generator can be linked so that a blockage in one does not require stopping the other. Watermaker servicing elements are contained next to the navstation for ease of access, and spares stowage in the pilot berth cabin is so tidy it was compared to artwork. Perry noted the VW 130-horsepower diesel would likely provide a comfortable nine-knot cruising speed under power.
Known Limitations
No serious structural defects emerged from the sources, but several ergonomic shortcomings were noted by the Yachting World reviewer after the passage. The cockpit backrests are too low and need additional cushioning for long watches. The genoa sheet lead is poor. The helm positions remain quite exposed, a consistent Oyster criticism that affects aesthetics as well as crew comfort in bad weather. The pilot berth is rather small, and the steep companionway was flagged as a con. The double sofa to starboard in the saloon may see limited use since the flatscreen TV is located behind it, making the screen invisible from that position. Perry also raised a question about the narrow, elongated skeg's construction and support that the subsequent sea trial did not specifically address. Larger hull ports were a recurring wish — the master cabin would gain an edge with bigger windows.
The Verdict
The Oyster 575 is the product of a mature, well-resourced builder applying real owner feedback to a proven formula. Humphreys' hull is genuinely fast for its displacement class, the construction quality is premium throughout, and the systems installation — especially the walk-in engine room — sets a standard that most production builders in this size range do not approach. The interior redesign that incorporated Seascape windows and a raised chart area flowing into the saloon added genuine usability rather than cosmetic polish. For a couple contemplating an ocean circuit with occasional guests, or a family wanting a charter-capable boat that doubles as a serious offshore cruiser, the 575 is a compelling choice. Its limitations are real but largely ergonomic rather than structural, and none are unusual for a boat of this type and era.
Pros
- Lighter than expected displacement for an all-out bluewater cruiser, aided by carbon and Kevlar construction
- Walk-in, double-insulated engine room with exceptional noise suppression and access
- Master cabin among the most comfortable in class for headroom and space
- Consistent passage-making pace at reach — nine knots is a repeatable number
- Highly configurable layout with crew cabin, workshop, or Pullman options
- Proven World Rally participant with nine-boat owner endorsement
Cons
- Skeg-hung rudder raises questions about long-term structural support that the builder has not publicly addressed
- Helm is not communicative — long linkage and dual autopilot rams dull feedback
- Exposed helm positions in bad weather; cockpit backrests too low for long passages
- Pilot berth is undersized relative to the overall scale of the boat
- Steep companionway requires care in a seaway
- Hull ports smaller than desirable given the saloon volume they serve
