High Tension 36 Information, Review, Specs

Sailing Performance & Handling

The High Tension 36 is defined by its IOR (International Offshore Rule) heritage, featuring the characteristic pinched ends and a relatively deep, high-aspect fin keel. According to period design notes from Jac de Ridder, the hull was engineered to be exceptionally stiff, a trait aided by the substantial lead ballast and SOS’s thick, hand-laid fiberglass construction. On the water, this translates to a boat that tracks with remarkable precision and maintains its momentum through a chop, avoiding the "hobby-horsing" often found in lighter designs of the same era.

The sail plan is typically a high-aspect masthead rig with a large overlapping genoa, which provides the primary driving force in light to moderate airs. Handling is described by owners as "athletic but predictable." Because the boat was designed during a period when rudder technology was evolving, the spade rudder on the High Tension 36 is deep enough to maintain grip even when the boat is pressed hard on a reach. Its Displacement-to-Length ratio suggests a vessel that sits "in" the water rather than "on" it, providing a sea-kindly motion that makes it a viable choice for offshore passage-making despite its racing pedigree.

Interior Comfort & Variations

Unlike many dedicated racing machines of the late 70s, the High Tension 36 features a fully realized cruising interior that reflects the high standards of Southern Ocean Shipyard. The layout is traditional and sea-going, generally featuring a large navigation station to starboard and a functional U-shaped galley to port, designed to remain usable while heeled. The use of high-quality teak joinery and the yard’s signature attention to finishing details elevate the cabin above the spartan standards of its contemporaries.

The model was primarily offered in a standard offshore layout with a forward V-berth and a saloon that converts into additional berths, though some semi-custom variations exist depending on whether the original owner prioritized racing or cruising. Its siblings in the High Tension range included the smaller High Tension 32 and the larger High Tension 40, both of which shared the same design language of a sharp entry and powerful shoulders. The 36-foot variant is often considered the "sweet spot" of the range, offering enough waterline for serious speed while remaining manageable for a small crew or couple.

Known Issues & Buyer’s Checklist

Prospective buyers of a High Tension 36 should focus on the following technical areas, common to Southern Ocean Shipyard builds of this vintage:

• Deck Core Integrity: SOS frequently used balsa coring for deck stiffness. While the laminates are thick, any poorly sealed hardware installations over the decades can lead to moisture ingress and localized delamination. A percussion test (hammer sounding) of the deck is essential.
• Keel Bolt Inspection: Given the performance orientation of the boat, the keel/hull joint (the "smile") should be inspected for signs of stress or movement, especially if the boat has a history of hard racing or groundings.
• Spade Rudder Bearings: The deep spade rudder puts significant leverage on the bearings. Check for excessive play in the steering system and inspect the rudder stock for signs of corrosion or fatigue.
• Original Engine Installation: Many units were originally fitted with Bukh or Volvo Penta engines that may be approaching the end of their service life. Access for repowering is generally good, but the cost of a modern diesel should be factored into the purchase price.
• Gelcoat Condition: While the structural glasswork is often superb, SOS gelcoats from the late 70s can be prone to "star crazing" around high-load areas like stanchion bases and winches.

Community & Resources

Owners of Southern Ocean Shipyard vessels are often supported by the broader community of De Ridder design enthusiasts. Technical information and original design philosophy can frequently be sourced through the Jac de Ridder Design archives, which remain a primary touchpoint for those looking to restore these vessels to their original specifications.

The Verdict

The High Tension 36 is a "sailor’s boat"—a robust, well-engineered vessel that successfully bridges the gap between an IOR racer and a reliable offshore cruiser.

Pros:

• Exceptional Build Quality: Benefiting from Southern Ocean Shipyard’s "Lloyds-standard" approach to fiberglass.
• Superior Windward Performance: Stiff and fast, especially in a blow.
• Timeless Aesthetics: A classic De Ridder profile that still looks purposeful and elegant.

Cons:

• IOR Tendencies: The pinched stern can make the boat somewhat lively when running downwind in heavy seas.
• Large Headsails: The masthead rig requires significant physical effort to tack the large genoas compared to modern fractional rigs.
• Age-Related Maintenance: Buyers must be prepared to address 40-year-old systems and potential deck core issues.