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RC Marblehead & Soling One Metre: Other AMYA Sailboat Classes Explained

If you already race IOM, DF65 or RG65, you are only seeing part of the AMYA map. Our existing IOM vs DF65 vs RG65 comparison covers the three classes most new radio sailors encounter first, but the AMYA rulebook also contains a deeper set of traditional one-design and development classes that are easy to overlook.

Two names usually anchor that conversation: the International Marblehead, the most open and technically ambitious hull in this group, and the Soling One Metre, one of the strongest traditional one-design fleets in the United States. Around them sit EC-12, US1M, Star 45, ODOM, CR 914, Victoria, SeaWind and 36/600 — ten classes that are rarely compared side by side.

This guide breaks down what each class is, how the rules shape the ownership experience, how large the current US fleets really are, and which class makes sense for a builder, a first-time racer or a sailor who wants the closest thing to a real 12-Meter in model form. If you are still deciding between a ready-to-sail model and a traditional club class, start with our best RC sailboats guide before committing to a build project.

AMYA Class Snapshot: Fleet Size and Rule Type

These AMYA counts are dynamic fleet indicators, not lifetime production numbers. What matters most in the table is the split between developmental classes and one-design classes, because that single distinction determines almost everything about cost, build time and tuning freedom.

International Marblehead — The Open Development Class

The modern International Marblehead is a development class in the purest sense: anything not specifically prohibited is permitted. That makes it the highest-tech class on this list.

The current rule uses a hull-length window of roughly 1,275 mm to 1,290 mm rather than a literal fixed 50.000-inch boat. The traditional American shorthand is still "50/800" — about 50 inches long with an 800-square-inch sail limit — but the modern international rule is the more accurate guide. Typical displacement runs from about 4.5 kg to 5.5 kg, maximum sail area is 0.5161 m², and draft can reach roughly 660 mm.

Marblehead has no useful fixed consumer beam figure. Beam, platform, rocker and foil geometry are design decisions, not class constants. Competitive boats carry a large rig wardrobe — the rule allows extensive mainsail and headsail combinations — so a serious program maintains multiple rigs rather than one all-purpose setup. Carbon hulls, foils and spars are common rather than exceptional.

The practical reality is that Marblehead is a project class, not a quick purchase. AMYA racing requires registration and measurement certification, with hull, appendages, sails and rigs checked by a class measurer. Boats come from specialist builders, custom construction, home building or the used market. Older hulls regularly resurface for electronics refits and restoration, and a used Marblehead can be a comparatively affordable route into the class if national-level competitiveness is not the immediate goal.

For the right sailor — an experienced racer, designer or tinkerer who wants a long-life platform with far more tuning depth than a fixed one-design — the Marblehead is the clear top of this comparison. For a first traditional club class, it is the wrong place to optimize for simplicity.

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Soling One Metre — The Big-Fleet One-Design

Soling 1M is the strongest contrast to Marblehead in the entire group. It is a tightly controlled AMYA one-design based on the full-size Olympic Soling, sanctioned in 1993, and it carries the largest US fleet of the classes compared here: roughly 62 clubs and about 1,336 registered boats.

The class box itself is simple. Hull length is 39.37 inches / one metre, the current minimum beam is 8-7/8 inches, minimum ready-to-sail displacement is 10 pounds, and the controlled sail plan delivers roughly 592 square inches of area. Draft is about 8 inches, which makes shore launching far easier than it is with a deep-fin development hull.

A Soling uses one rig only — conventional mainsail and jib — and sanctioned racing permits just two control functions: rudder and combined sail-sheet control. The hull, deck, keel and rudder come from approved class kit producers, with vacuum-formed plastic construction central to the one-design concept. Approved sources include 3DRC Boats and Vac-U-Boat. Aluminum or permitted wood spars keep the class out of an exotic-material arms race, and ballast rules prescribe lead shot rather than open-ended custom casting.

Ownership is beginner-friendly on the water but intermediate on the bench. Kit tiers range from a basic builder package to substantially more prepped examples, so total build commitment depends on which tier you choose. The one-rig, two-control rule removes a major equipment variable, and the large fleet means boat setup — servo geometry, sheet travel, sail tension, hull alignment — matters more than budget when racing.

3DRC resumed ordering in late July 2026 and restarted shipping in late August with stated lead times of roughly four to ten weeks. Current Soling kits are not a meaningful Amazon category; our where-to-buy guide explains why traditional specialty classes often live outside mainstream marketplaces.

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EC-12 — The 12-Meter Experience in Scale

The EC-12 is the largest and heaviest boat in this comparison: a controlled-hull class based on a 12-Meter-derived form, roughly 58 to 59 inches long and about 24 pounds ready to sail. Sail area is approximately 1,200 square inches on the current supplier overview, and the mast stands about 72 inches above the deck.

This is a logistics class as much as a sailing class. A five-foot hull, tall mast, 20-plus-pound sailing weight and multiple rigs change how you store, transport and launch the boat. The class uses A, B and C sail configurations for different conditions, and the rules permit up to four control functions, which gives considerably more on-water adjustment than Soling 1M, ODOM or SeaWind.

The hull must come from an authorized source, and the normal build path is a short kit — hull, deck, rudder and ballast — followed by custom completion. Commissioned race-ready builds are also available from certified manufacturers. This is an intermediate-to-advanced boat for someone who wants big-yacht inertia, traditional 12-Meter looks and tactical club racing rather than casual pond sailing.

U.S. One Meter — The One-Metre Design Laboratory

US1M is a developmental class at the same nominal one-metre length as Soling, but the similarity stops there. The rule is an envelope: approximately one metre long, 600 square inches of measured sail area — with roughly another 50 square inches of free area created by the measurement method — a maximum keel depth near 14-1/4 inches, and a mast capped at about 65 inches above the deck.

There is intentionally no single US1M beam or displacement. That freedom is the point. The class keeps a monohull base and bans movable ballast, movable keels, hydrofoils, multihull configurations and similar devices, but designers are free to develop hulls, rigs and platforms inside the box.

That makes US1M a home-builder and self-designer's class: plans, scratch-builds, older designs and used boats dominate. It suits an intermediate builder following an established plan, or an advanced sailor who wants to design something rather than buy another identical hull.

The cleanest illustration of the rule difference is ODOM. ODOM began as a successful US1M-style design that the class later froze into a one-design. Two boats can share a one-metre length and similar sail area, yet offer opposite ownership experiences: US1M encourages design development, while ODOM deliberately removes that variable.

Star 45 — The Builder's One-Design

Star 45 is the answer for racers who enjoy construction as much as sailing. It is a 45-inch, semi-scale interpretation of the full-size International Star, with a hard-chine hull and major dimensions controlled by the class rule.

Typical displacement is 12 to 13 pounds, with a 12-pound minimum. Sail area is approximately 1,000 square inches, and the class centers on a primary A rig with an optional smaller B rig for stronger air. A rubber bow bumper is a race-safety requirement.

What makes Star 45 distinctive is that controlled geometry does not mean factory-identical construction. Wood scratch-builds from AMYA plans are legal, as are fiberglass components and laser-cut frames. A hand-built wooden hull and a molded component boat can race in the same fleet under the same class envelope. That is a useful corrective to the assumption that "one-design" always means a row of identical molded hulls.

The normal sourcing path is plans, laser-cut frames, fiberglass components or a commissioned build — not a checkout-and-box retail purchase. This is an intermediate-to-advanced builder's class with real craftsmanship inside the rule set.

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ODOM — The Frozen One-Metre Class

ODOM — One Design One Meter — is exactly what its name says: a successful one-metre concept frozen into a controlled one-design form. Hull length is 39-3/8 inches, minimum sailing weight is 7 pounds 6 ounces, and the class allows two control functions: rudder and sheets.

The hull, deck, rudder, keel and mast must all originate from the authorized class manufacturing system. Sail area is commonly quoted around 600 square inches, though the current class rule is best expressed through its controlled sail dimensions rather than a single marketing figure.

The fleet is modest at roughly 222 boats, but the class remains visibly active — recurring ODOM racing is on the AMYA schedule, including San Diego Argonauts events. Sourcing is specialist and often club-mediated rather than mass retail. Used ODOMs do not always appear on the open market, so the practical route is usually through an active fleet or class contact.

ODOM is the best choice when you want a fast, uncomplicated one-metre with strict geometry and predictable handling, without stepping into the full development freedom of US1M.

CR 914 — The Structured Traditional Kit

The CR 914 is a strict one-design modeled on an America's Cup-style boat at 1:25 scale. It is 914 mm / 36 inches long, with a current minimum displacement of 6.25 pounds and a sail area of 658 square inches per the current AMYA class page.

Construction is straightforward and consistent: one-piece ABS hull and deck, molded keel fin and rudder, aluminum spars, lead bulb and rip-stop polyester sails. The single sloop rig means there is no multi-rig wardrobe to buy or maintain.

This is the most structured buildable option in the group. Current kits are available from Chesapeake Performance Models, with an estimated standard kit workload of around 15 to 20 hours depending on finishing and paint skill. That places the CR 914 between an RTR and a full scratch project — enough construction to teach hull prep and rigging, but not a months-long campaign.

For a first traditional AMYA racer who wants a real build without Marblehead-level complexity, CR 914 is one of the strongest entries. If you are comparing it with other kit options, our RC sailboat kits guide covers the format expectations in detail.

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Thunder Tiger Victoria — The Small, Portable One-Design

Victoria is the smallest and lightest mainstream class in this list and still carries a strong AMYA footprint at roughly 486 boats across about 30 clubs.

The boat itself is 779 mm / 30.7 inches long with a 197 mm beam, a manufacturer weight of 2.1 kg and a class minimum around 4.5 pounds. Sail area is 433 square inches. The kit is highly prefabricated: one-piece ABS hull and deck, anodized mast and boom, supplied sails and rigging hardware. A two-channel radio is required but not included.

The class rule allows legal rig and sail-tuning latitude, which is why Victoria has such a long-running upgrade community. The base boat is accessible, but owners can improve rigging and sail handling without leaving the class framework. Its practical advantage is transport: at under 31 inches and roughly 4.5 pounds, it can live assembled in many vehicles and is easy to launch at small ponds.

Contrary to older used-only assumptions, the current Thunder Tiger store lists the Victoria 5556 v2017 kit as orderable directly from the manufacturer. That makes Victoria one of the few inexpensive traditional classes with an active direct-buy path.

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Kyosho SeaWind — The Most RTR-Like Traditional Class

The SeaWind is the closest thing in this group to a conventional ready-to-sail class boat. Kyosho's 40462ST2 Readyset package includes a preassembled ABS hull, removable mast, keel and rudder, plus a KT-431S 2.4 GHz radio with installed rudder and sail-control servos.

Hull length is 998 mm — conventionally classed as one metre — with a 226 mm beam, roughly 3,100 g total weight and about 604 to 605 square inches of sail area. The class rules are tight, limiting retrofit advantages, so a new owner does not need an immediate upgrade plan.

The 2026 issue is supply rather than legality. The official Kyosho US listing is currently out of stock, and alternative retailer inventory is inconsistent. That type of availability fluctuation is common with traditional specialty classes and is not the same thing as a dead class. If the boat is available from a fleet or local retailer, SeaWind is a strong beginner-to-intermediate one-design, particularly where a local class exists.

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36/600 — The Purest Small Design Class

36/600 is the final developmental class here, and it has the simplest rule set: maximum 36-inch hull length and maximum 600 square inches of sail area, plus safety and format prohibitions that ban movable ballast, outriggers and multihull tricks.

Everything else is open. AMYA reports real designs ranging from under 5 pounds to more than 8 pounds, beams from roughly 5 inches to more than 8 inches, and mainsail luffs from about 45 inches to more than 60 inches. Two legal 36/600 boats can look and behave completely differently, which is exactly the appeal.

That broad envelope produces a low-cost designer's class: plans, scratch-builds, owner-designed boats and used examples dominate. It is beginner-friendly when you follow an established plan and advanced the moment you start exploiting the rule. If CR 914 is a controlled factory one-design at 36 inches, 36/600 is the same length set free.

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Rule Philosophy: Where Each Class Sits

A fast way to choose is to place each class on the development-to-one-design spectrum.

The practical consequence of the spectrum is cost structure. Development classes look cheaper on a bare-hull basis but reward extra rigs, improved foils and repeated iteration. Strict one-designs concentrate spending up front and remove most of the long-term equipment arms race.

Frequently Asked Questions

Conclusion

The AMYA rulebook holds more than IOM, DF65 and RG65. Marblehead remains the open development benchmark, built around a 1,275–1,290 mm hull, deep draft, multiple rigs and genuine design freedom. Soling 1M remains the opposite: a tightly controlled one-design with the largest traditional US fleet and a clear kit-based path to the racecourse.

The rest of the landscape is best understood as a spectrum. US1M frees the one-metre idea for home builders; ODOM freezes it. Star 45 adds craftsmanship inside a controlled hull; EC-12 scales the concept up to a five-foot, 24-pound 12-Meter experience. CR 914, Victoria and SeaWind bring the traditional one-design closer to a structured or RTR-style ownership format.

Where you land depends on build appetite, transport reality and the fleet you can actually race against. If you want to build a traditional club boat, compare the kit formats here. If you want to understand what wears out and what is worth replacing, start with the sailboat parts guide. And if an off-the-shelf modern one-design is the better fit, return to the full RC sailboat picks.