Slipway 5 Tonner Information, Review, Specs

Sailing Performance & Handling

The Slipway 5 Tonner is designed for stability and "sea-kindliness" rather than outright speed or close-hauled performance. Featuring a traditional long keel and a heavy displacement-to-length ratio, the boat tracks exceptionally well, making it a relaxing vessel to steer on long passages. Its underwater profile allows it to shrug off the "stop-start" motion often felt in lighter displacement boats when encountering a head sea.

According to technical reviews from the period, the boat is typically rigged as a masthead Bermudan sloop. While it may not point as high as a modern fin-keel yacht, its ability to carry momentum and its predictable motion in a blow make it a formidable heavy-weather performer. Handling under power is typical for a long-keeled vessel; it requires a proactive approach when reversing due to significant prop walk, but it is steady and reliable once moving forward.

Interior Comfort & Variations

The interior of the Slipway 5 Tonner is characterized by a "shipshape" layout that maximizes the limited volume of a 25-foot hull. The cabin typically features a four-berth configuration: two settee berths in the main saloon and a V-berth in the forward cabin. The use of heavy hardwoods and thick laminates gives the interior a traditional, cozy feel that contrasts with the more clinical "white-out" interiors of modern production yachts.

The galley is usually located at the foot of the companionway for optimal ventilation, featuring a modest sink and cooker. Headroom is respectable for a boat of this length, often reaching nearly six feet under the main hatch, though it tapers forward. Variations of the model are rare, but the interior joinery was often finished to a high standard, with many owners having customized the layout for extended solo or couple’s cruising.

Known Issues & Buyer’s Checklist

Prospective buyers should approach a Slipway 5 Tonner with the understanding that these vessels are now decades old and may require restorative maintenance. High-signal areas for inspection include:

• Osmosis and Hull Blistering: Early GRP builds from this era are susceptible to osmotic blistering. A professional survey of the hull below the waterline is essential to check for moisture levels and laminate integrity.
• Engine Accessibility and Age: Many original models were fitted with Bukh or early Yanmar diesel engines. While these are reliable units, check for signs of chronic salt-water corrosion on the cooling jacket and verify if the stern gland or cutless bearing requires replacement.
• Chainplates and Rigging: Given the boat’s heavy displacement, the rig experiences significant loads. Inspect the points where the chainplates meet the deck and hull for stress cracks or signs of water ingress into the core.
• Deck Core Integrity: Most Slipway models utilized a sandwich construction for the decks. Buyers should walk the side decks to check for "sponginess," which indicates delamination or water ingress into the core material.

Community & Resources

The Slipway 5 Tonner is frequently featured in classic cruiser discussions and has been documented in historical databases such as the National Historic Ships registry through the history of the Slipway Cooperative. While it does not have a dedicated one-design class association, owners often find technical support and heritage information through the various "Old Gaffer" associations or classic boat forums, where the yard's Lowestoft heritage is well-regarded.

The Verdict

The Slipway 5 Tonner is an ideal choice for the sailor who prioritizes safety and traditional lines over modern racing capability. It is a "pocket blue-water" boat that feels significantly larger than its 25 feet.

Pros:

• Exceptional stability and sea-kindly motion in heavy weather.
• Traditional, high-quality "little ship" aesthetics and interior.
• Strong, overbuilt GRP hull suitable for adventurous coastal cruising.

Cons:

• Lackluster light-wind performance and modest pointing ability.
• Typical long-keel handling difficulties when maneuvering in tight marinas.
• Requires a diligent maintenance schedule for aging GRP and original machinery.