Ontario Sonar Information, Review, Specs

Sailing Performance & Handling

The Sonar is widely praised for its balance and tactile feedback. With a displacement of 2,100 lbs and 900 lbs of that concentrated in its lead keel, the boat possesses a ballast-to-displacement ratio of approximately 43%. This makes the Sonar remarkably stiff for its size, allowing it to carry its 250 square feet of sail area well into heavy air before reefing becomes necessary. According to the Sonar Class Association, the boat was designed to be easily handled by a crew of three or four in a racing environment, yet it remains manageable for a single sailor or a couple when used for recreation.

Its handling characteristics are defined by a deep, high-aspect spade rudder that provides precise control even when the boat is pressed hard. Unlike many 23-footers of its era that struggle with weather helm, the Sonar remains light on the tiller. The hull features a fine entry and a flat run aft, allowing it to plane in heavy air under spinnaker—a rare feat for a fixed-keel boat with such a traditional appearance. Editorial analysis from Sailing World has often highlighted the boat’s versatility, noting that its performance envelope is wide enough to satisfy elite racers while remaining forgiving enough for novice sailors at community sailing centers.

Interior Comfort & Variations

While the Sonar’s primary focus is the cockpit, it does feature a small cuddy cabin that differentiates it from pure open-boat designs. The interior is Spartan, offering two simple settee berths and a dedicated space for a portable head. There is approximately 4 feet of headroom, which precludes standing, but the cabin provides a dry refuge for gear or a space for children to rest during a long day on the water.

The Sonar is a strict one-design class, meaning there are no "luxury" or "cruising" hull variants. However, variations exist in the production runs between builders. While Ontario Yachts was the primary manufacturer, licensed production was also carried out by Seaward Marine in the UK and Carroll Marine in the United States. Owners often note that Ontario-built boats are highly regarded for their fiberglass layup consistency and durable gelcoat finishes. The interior remains identical across these builders to ensure the integrity of the one-design racing class.

Popular Mentions & Media

The Sonar’s most significant cultural and media footprint stems from its tenure as a Paralympic equipment class. Its selection was based on the "level playing field" it provided, where the boat's inherent stability allowed athletes with various physical disabilities to compete at the highest level of the sport. The Sonar has also been the boat of choice for the United States Yachting Championship (the Rolex International Women's Keelboat Championship) for many years, cementing its status as a premier platform for testing tactical skill over equipment advantages.

Known Issues & Buyer’s Checklist

Prospective buyers should focus on several key areas common to boats of this vintage:

• Deck Core Integrity: Like many Ontario Yachts builds of the 1980s, the Sonar uses a balsa-cored deck. Moisture ingress around the shroud chainplates or the mast step can lead to core delamination. Buyers should check for "spongy" spots or stress cracks in these high-load areas.
• Rudder Gudgeons: The spade rudder is a high-performance component, but the gudgeons and bushings can wear over time, leading to "slop" or vibration in the tiller.
• Keel Bolt Inspection: While the Sonar’s keel is extremely secure, older models may show the "smile" at the leading edge of the keel-to-hull joint. While often cosmetic, it should be inspected to ensure the internal floors are not showing signs of compression.
• Keel Sump Drainage: Because the cockpit is self-bailing, the small sump in the cabin can sometimes be neglected. Check for standing water or signs of historical saturation in the cabin sole.

Community & Resources

The boat is supported by the Sonar Class Association, which remains one of the more active one-design organizations in North America. They maintain a comprehensive technical library, including rigging guides and tuning sheets that are essential for anyone looking to optimize the boat for racing. Many local fleets exist in sailing hubs like Long Island Sound, Marblehead, and the Great Lakes.

The Verdict

The Ontario Sonar is a rare example of a boat that excels in two disparate roles: it is a fierce one-design racer and a safe, comfortable family daysailer.

Pros:

• Exceptional stability and safety, suitable for all ages and physical abilities.
• Enormous 11-foot cockpit that comfortably seats six adults for daysailing.
• Highly active one-design racing community ensures strong resale value.
• Simple rigging that is easy to master but offers enough controls for technical tuning.

Cons:

• Minimal cabin accommodations limit its utility for overnight cruising.
• Balsa-cored decks require vigilant maintenance to prevent moisture issues.
• Requires a significant trailer/tow vehicle compared to smaller dinghy-style boats.