Int Cadet Information, Review, Specs

Int Cadet Drawing
Make
Int
Model
Cadet
Builder
Designer
Jack Holt
Number Built
8000
Production Year(s)
1947 - ??

Designed in 1947 by the prolific Jack Holt in collaboration with Yachting World magazine, the International Cadet is arguably the world’s most influential youth training dinghy. Measuring 3.22 meters (10.5 feet) in length, it was conceived as a "proper" boat in miniature, offering a two-person, three-sail experience that bridges the gap between basic single-handers and high-performance racing skiffs. Unlike many junior boats that utilize a simple cat rig, the Cadet features a fractional sloop rig complete with a symmetric spinnaker, specifically intended to cultivate teamwork between a skipper (typically aged 13–17) and a younger crew (as young as 7). Since its inception, over 10,000 units have been built, and it remains a World Sailing recognized International Class with active fleets across Europe, Australia, and South America.

Sailing Performance & Handling

The Cadet’s performance is defined by its hard-chine "pram" hull design, which provides exceptional initial stability—a critical feature for building confidence in young sailors. While it is not a high-speed planing machine by modern standards, its handling is nuanced and tactical. The hull’s flat sections allow it to plane in moderate breezes, while the hard chine helps the boat track well upwind, even when over-canvassed.

Because it utilizes a mainsail, jib, and spinnaker, the boat handles like a scaled-down keelboat or a larger racing dinghy. This complexity is its greatest educational asset; it teaches the crew about jib trim and spinnaker pole handling while the helm focuses on tactics and balance. In editorial retrospectives, such as those found in Yachting World, the boat is frequently praised for its "mentorship" dynamic, where the physical size constraints of the cockpit necessitate that the helm and crew work in close, synchronized harmony. With a hull weight of approximately 54 kilograms and a total sail area of roughly 5.2 square meters, the boat is responsive to weight shifts, punishing poor positioning but rewarding a coordinated team with surprising agility.

The International Cadet holds a unique place in nautical history as the "Class of Champions." Its cultural footprint is marked by the caliber of sailors who began their careers in its cockpit. Most notably, Jacques Rogge, the former President of the International Olympic Committee, was a Cadet champion in 1959. Other alumni include Olympic gold medalist Rodney Pattisson and numerous world-class offshore racers. The boat was famously part of a post-WWII movement to democratize sailing, originally sold as a plywood kit for self-assembly, which allowed thousands of families to enter the sport affordably. In 2023, it was featured in a "Coolest Boats" series by Yachting World, where it was nominated for its enduring relevance in maritime education.

Known Issues & Buyer’s Checklist

Whether considering a vintage wooden Mark II or a modern GRP Mark IV, buyers must focus on structural integrity and safety compliance.

  • Buoyancy Tank Integrity: The most critical safety check for any Cadet is the airtightness of its buoyancy tanks. Class rules require an annual buoyancy test. Check for perishing rubber gaskets on hatch covers and ensure the internal bulkheads are not weeping.
  • GRP Soft Spots (Mark IV): Older fiberglass models can develop "soft" or delaminated sections on the side decks where the crew frequently sits or "hikes." Press firmly across the decks to check for any deflection or crunching sounds.
  • Wooden Hull Rot (Mark I/II): For plywood variants, inspect the "hog" (the internal timber running along the keel) and the bottom of the transom for signs of rot. The area around the centerboard case is particularly prone to freshwater damage if the boat has been stored outside without a breathable cover.
  • Centerboard Trunk Wear: Constant raising and lowering of the centerboard can wear down the gelcoat or timber inside the case. If the glass matting is exposed, it can lead to water ingress into the core of the hull.
  • Mast Step Compression: Check the area where the mast meets the deck or keelson. On older boats, the constant rig tension can cause the mast step to sink or the deck to bow, leading to a loss of rig control.

Community & Resources

The primary governing body is the International Cadet Class Association (ICCA), which manages the class rules and coordinates the World and European Championships. National branches, such as the UK Cadet Class Association and the Australian International Cadet Class, provide extensive technical support, tuning guides, and vibrant regional racing circuits. These associations are the best starting point for finding "measured" boats that are legal for sanctioned competition.

The Verdict

The International Cadet remains the gold standard for teaching the technical and interpersonal aspects of double-handed sailing.

Pros

  • Exceptional Training: Teaches three-sail handling and tactical teamwork at a very young age.
  • Stable Design: The hard-chine hull is forgiving for beginners while remaining competitive for experts.
  • Global Community: A robust international racing circuit and strong class associations ensure high resale value and plentiful parts.
  • Mentorship: The age gap between helm and crew creates a unique leadership environment.

Cons

  • Size Constraints: The cockpit is strictly for juniors; most sailors outgrow the boat by age 17.
  • Maintenance: Older wooden models require significant upkeep compared to modern rotomolded alternatives.
  • Complexity: The spinnaker and jib systems may be overwhelming for a child’s very first day on the water.

Measurements

Construction & Hull

Construction Material
Hull Type
Monohull Sailboat
Keel Type
Centerboard
Rudder
1x —
Ballast
-
Displacement
119 lbs
Water Capacity
-
Fuel Capacity
-

Dimensions

Length Overall (LOA)
10.56 ft
Waterline Length (LWL)
-
Beam
4.17 ft
Draft
2.46 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Fractional Sloop
P (Main Luff)
-
E (Main Foot)
-
I (Foretriangle Height)
-
J (Foretriangle Base)
-
Forestay Length (est)
-
Sail Area
56 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
37.03
Ballast / Displacement Ratio
Displacement / Length Ratio (D/L) Ratio
Comfort Ratio
Capsize Screening Formula
3.39
Hull Speed
— kn