Iroquois 30 Mk II Information, Review, Specs

Sailing Performance & Handling

The sailing characteristics of the Iroquois 30 Mk II are defined by its high power-to-weight ratio and its use of twin daggerboards. Unlike modern cruising catamarans that often rely on fixed low-aspect keels, the Mk II’s daggerboards allow it to point significantly higher into the wind, rivaling the windward performance of contemporary monohulls. According to technical archives at The Catamaran Association, the boat is known for its "lively" feel; it accelerates rapidly in puffs and can easily maintain double-digit speeds in a moderate breeze.

Under the right conditions, a well-sailed Mk II can exceed 15 knots, though this performance comes with a caveat. Because the beam is relatively narrow by modern standards, the boat has a lower limit of stability than today’s wider cruising cats. This "classic" catamaran geometry requires an attentive crew; in heavy weather, reefing early is essential to prevent the windward hull from lifting too high. Its sea-kindliness is generally praised, though the low bridge deck can lead to "slamming" in short, choppy head seas—a common trait for multihulls of this era. Owners often report that the boat tracks exceptionally well off the wind, provided the daggerboards are raised to reduce drag and prevent tripping in following seas.

Interior Comfort & Variations

The interior of the Iroquois 30 Mk II is a masterclass in 1970s spatial efficiency, designed to provide "genuine" cruising accommodations within two narrow 30-foot hulls. The Mk II improved upon the Mk I by offering slightly more headroom and a more refined layout. Typically configured with two double cabins aft and two single berths forward, the boat can technically sleep six, though it is most comfortable for a couple or a small family.

The bridge deck houses a compact saloon with a dining table that often converts into an additional berth. The galley is traditionally located in the starboard hull, while the head and navigation station occupy the port side. While the finish is functional rather than luxurious—heavy on molded GRP and wood accents—the Mk II felt significantly more modern than its plywood-built contemporaries. Sailcraft also offered a "stretched" version known as the Iroquois S, which featured longer transoms to improve buoyancy and reduce pitching, and the Comanche 32, which expanded the same basic design into a wider, more spacious platform for long-range cruising.

Popular Mentions & Media

The Iroquois 30 holds a legendary status in the history of offshore racing. It rose to prominence after an Iroquois won the 1969 Crystal Trophy, a major offshore multihull race, proving that these boats were not just daysailers but serious blue-water contenders. The model's reputation for speed was further cemented when it became a staple in early editions of the Round Britain Race. Its cultural footprint is also tied to the "multihull pioneers" of the 60s and 70s, often appearing in the memoirs of early catamaran voyagers who appreciated the boat's ability to outrun weather systems.

Known Issues & Buyer’s Checklist

Prospective buyers should approach an Iroquois 30 Mk II with a technical checklist focused on the longevity of 1970s fiberglass construction.

1. Daggerboard Case Integrity: The daggerboard trunks are high-stress areas. Inspect the seals and the internal structure of the cases for signs of stress cracking or water ingress into the surrounding core.
2. Deck Delamination: Like many boats of this era, the Iroquois used balsa or foam coring in the decks. Over time, moisture can penetrate through poorly bedded deck hardware, leading to soft spots that require expensive "drill and fill" or skin replacement repairs.
3. Bridge Deck Slamming Stress: Check the junction where the bridge deck meets the hulls. Hard use in heavy seas can lead to stress crazing or structural fatigue in these transition zones.
4. Capsize Recovery Systems: Due to its narrow beam, many Iroquois were retrofitted with masthead floats or righting systems. If a boat lacks these, the buyer should evaluate their own comfort level with the vessel's stability profile in offshore conditions.
5. Rigging Loads: The shroud chainplates take immense loads on a catamaran. Ensure that the bulkheads supporting these chainplates are dry and structurally sound, as any rot here can lead to a catastrophic rig failure.

Community & Resources

The primary hub for technical support and historical data is The Catamaran Association, which maintains records on the Iroquois series and offers a wealth of knowledge on maintaining classic British multihulls. While the original Sailcraft Ltd. is no longer in operation, the class remains active in European "Old Timer" regattas, where the Iroquois 30 Mk II continues to be a competitive participant.

The Verdict

The Iroquois 30 Mk II is a "sailor's catamaran," offering a level of engagement and speed that modern, high-volume cruising cats rarely match. It is an ideal entry-point for those who prioritize performance and historical pedigree over apartment-like living space.

Pros:

• Exceptional speed and windward performance for its age.
• Compact enough for standard marina berths (due to the narrow beam).
• Robust GRP construction that is manageable for DIY owners.
• Proven offshore capability with a successful racing pedigree.

Cons:

• Lower ultimate stability compared to modern, wider-beam catamarans.
• Limited headroom and narrow hulls can feel cramped during extended stays.
• Bridge deck slamming can be noisy and uncomfortable in certain sea states.
• Requires active sail management in gusty conditions to ensure safety.