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International Folkboat

International Folkboat is a 25 ′ 9 ″ / 7.9 m monohull sailboat designed by Tord Sundén and built by Marieholm Boats starting in 1967.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

Although similar, the INTERNATIONAL FOLKBOAT is not part of the NORDIC FOLKBOAT class since it does not have the ‘clinker built’ hull and was designed for fiberglass construction. First constructed in 1967 by Tord Sundén, it was accepted as one design class by Svenska Seglarförbundet. Most INTERNATIONAL FOLKBOATS have been built by Marieholms Bruk in Småland (SWE). Boats have also been manufactured on licence, in Australia and the UK. More than 2220 have been built in Sweden alone. Basic dimensions taken from class rules.

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International Folkboat – a Classic Pocket-cruiser: Used Boat Review

The genetic offspring of the nordic folkboat, this fiberglass 26-footer has plenty of fans..

As keepers of the narrative truths known to non-believers as mere “sea stories,” we sailors are drawn not only to the boats we desire but the stories behind them. Some might go so far as to suggest the story has as much value as the boat itself, and there certainly have been some pretty crummy boats that sold well because of the fiction their builders spun. How many times have you gone to look at a used boat and the owner has whispered seductively, “This boat has a great story behind it?”

Well, if you are drawn to stories (true stories, not marketing pap), like the idea of a tacit connection with blond-haired Scandinavians with names like Ingrid, Sven, and Tord, and can see yourself proudly tooling around in a 1968 Volkswagen Beetle, then the International Folkboat is definitely a boat worth looking into. True, there are many boats that might appeal to the profile described above (some Carl Alberg sloops come to mind), but few have a story that compares to that of the International Folkboat.

Design Details

The drama behind the International Folkboat began even before the boat existed. In 1939, as Hitler pushed the world into World War II, the neutral Swedes optimistically held a yacht design contest. The winning boat was to be put into production as a new popular class of keelboats. It is from that contest that the svelte little micro-cruiser that came to be known as the Nordic Folkboat emerged. Although we’ve not the space to cover some of the juicier details of the Nordic Folkboat’s design origins, even the thumbnail view is compelling. For those interested, Deiter Loibner provides a detailed account of the controversy surrounding the design in his excellent book “The Folkboat Story: From Cult to Classic.”

The designer of the IF Folkboat was Todd Sunden, who until he died in 1999 at the age of 90, was still fighting to establish his claim as the primary designer of the storied Nordic Folkboat, the International Folkboat’s genetic predecessor. No one questions that Sunden drew the lines of the Nordic Folkboat, but whether he deserved credit or payment for later royalties remains under dispute.

According to Loibner, this much is known: In 1941, a committee of judges formed by the Royal Swedish Sailing Association chose the best designs of its international contest for a new keelboat design. Trouble was that the judges couldn’t settle on one design. Instead, the favorite drawings were handed over to Sunden, who was tapped to come up with a new design that incorporated the “best of the best” from the contest.

The result was the Nordic Folkboat, a clinker-built sloop with a reverse transom, a spoon bow, and a low cabin that gave it simple but pretty lines. Its long keel, slack bilges, barn-door rudder, and hefty ballast ratio (just over 50 percent) equipped it for North Sea adventures. The cockpit however—because it was not self-bailing—raised the risk quotient for any offshore ambitions. The 7/8-fractional rig gave it a conservative sail-area displacement ratio of 16.28. The length-to-beam ratio was just under 3.5. The four-foot draft appealed to the shoalwater challenged. Headroom was ideal for those wonderful creatures of Scandinavian folklore: elves.

Simple, relatively inexpensive to build, and reassuring in heavy weather, the boat was a hit in Scandinavia, even among the non-elves. In the post-war era, carried by the same back-to-basics current that swept the Volkswagen Beetle into the 1960s mainstream, the Folkboat dream gradually spread throughout Europe and beyond. In the U.S., a Danish Folkboat-disciple by the name of Sven Svendsen brought the gospel to the U.S. West Coast, more precisely to the San Francisco Bay area. In a rare moment of maritime synchronicity, a boat, a place, and a collective spirit converged just as the 1970s set in.

Out of these contentious beginnings and in the midst of these “interesting times,” the International Folkboat emerged in 1967. Conscious of the folkboat’s growing appeal, Swedish builder Marieholms Bruk contracted Sunden to draw a fiberglass version, and, the boat eventually eclipsed its original in popularity, with 3,400 hulls built when production ended in 1984. From a design perspective, the International Folkboat shares many of the same features as the Nordic Folkboat (see table page 13).

Gone is the clinker hull—a feature that persisted in even the fiberglass Nordic Folkboat that Svendsen pioneered. The reverse transom has been cut short, and a shallow self-draining cockpit replaces the Nordic Folkboat’s deep well. Marieholms also made room for an inboard or an outboard in a well. However, since the well was designed to fit the small British Seagull outboard, it isn’t much help with today’s four-strokes. Most owners close the hole permanently with fiberglass and put an outboard bracket on the stern, but an electric Torqueedo (see page 13) will fit just fine.

Overall, the International Folkboat is a good-looking, wholesome, stiff design that is at its best when the wind kicks up. It is no wonder the Bay Area sailors have

acquired a taste for them.

The International Folkboat is well set for single-handed sailing. Although the original boat had mast-mounted halyards, nearly all the boats today have the halyards routed back to winches near the companionway. The mainsheet halyard runs on an aluminum track traversing the back of the cockpit, and the jib sheets lead through a rail-mounted genoa track to winches on the coaming. Early models came with bottom-grinding primary winches, but many are equipped with Lewmar single-speed winches. The mainsheet traveller is a notorious shin-whacker, but it makes for easy sail-handling from the helm.

The cockpit seats are 14.5 inches wide and 65 inches long, too short and narrow for non-elves to nap. Seat backs are 11 inches, too low to offer much back support, but about what you can expect from a boat of this size. Two 16-inch-by-19-inch cockpit lockers aft are not self-draining, so if you want to follow in the footsteps of some Folkboat adventurers, dogging these down will spare you a tedious bailing routine. Four 1.5-inch cockpit drains (exceptional for a boat this size) and a 12-inch bridgedeck reduces the risk of cockpit flooding.

The cockpit is tight for more than three adults, particularly if the wind is up. However, with one other person on board, it is a nice feeling to be wedged back behind the traveler. The cockpit is narrow enough that you can tuck behind the traveller and brace your feet on the leeward coaming or cockpit seat. With the mainsheet close at your side, you can confidently press to windward when others are still at the dock waiting for the whitecaps to ease. Some spray will cross the bow, but most International Folkboats come equipped with a cockpit dodger, a worthwhile investment.

Going forward, the sidedecks are wide, and the foredeck offers plenty of working space. Two aluminum handrails are on either side of the cabin-top. The standard boat did not come with a hawse pipe or bow anchor roller, but many owners have added these features. Although the area at the base of the mast has some nonskid patches, the rest of the cabintop is dangerously smooth. Since the boat’s thin gelcoat wears through with age, many older boats have painted decks, and these boats usually have improved nonskid on the deck and cabintop. The nonskid pattern on the sidedeck and foredeck is adequate, although it is probably worn to the point of being useless on some older boats.

The hardware is well-fastened with through-bolts and backing plates. This was the first 26-footer we’ve seen in a while with 10-inch cleats. Some of the hardware is marinium, an alloy common in the 1970s that is a poor substitute for silicone bronze, but these components are beefy and seem to be holding up on older boats. The deck-stepped, anodized aluminum Proctor masts with swept-back spreaders (7.5 degrees) are holding up as well as can be expected. The mast has sheaves at the base that allow the internal halyards to be routed to the cockpit. Owners or prospective buyers should check spreader tips for corrosion and remove any tape that does nothing but invite further corrosion.

Featuring just 55 inches of headroom, the interior of the International Folkboat is hardly palatial, but it can serve quite well as a weekender, if properly equipped. The range of amenities can vary greatly, and many of the options described here are likely to be absent on a boat that has been stripped down for racing. For sleeping, you have the choice of two long settees that stretch aft from the main cabin and tuck under the cockpit (with 35 inches of clearance), and a 72-inch-long V-berth forward with an 18-inch-by-24-inch hatch overhead. You could bridge the settees to make a double-berth athwartship, as some owners have.

For cooking, some IFs have a convertible galley comprising an alcohol two-burner Origo stove that folds down from a locker over the port settee near the companionway. A filler board “counter” drops in between the stove and the small sink near the mast, effectively forming a fore-and-aft galley. Just forward of the sink is a small hanging locker. Across from the locker is a ridiculously cramped head that is too narrow to be of much use. Many boats have turned this token nod to civility into another locker and put a port-a-potty under the V-berth. Above the settees on either side stretch a row of lockers, fine for storing small lightweight items. For mealtime, a removable table fits into a socket in the main cabin. The table also fits into a similar socket in the cockpit.

A 25-gallon water tank was optional, and some early models had the spigot in the cockpit, which according to an early review in Boating magazine was put there so that the cockpit scuppers could be used as sink drains. Many boats have creative tents fashioned over the cockpit area, which greatly expands the amount of “living space,” such as it is.

Many owners use their boats for weekend or long-solo voyages. Adam Correa sailed his International Folkboat in last year’s Single-handed Transpac Race, and Blondie Hasler’s famous Jester (a modified Nordic Folkboat) crisscrossed the Atlantic many times. Given the limitations of the boat’s smallish interior, those attracted to the Folkboat concept but in need of a little more “cruisability” might want to look into the Contessa 26 or the Cheoy Lee Frisco Flyer—both derivatives of the Nordic Folkboat. The Contessa has made many notable offshore voyages, including circumnavigations by Tania Aebi and Brian Caldwell, both of whom circled the globe while still in their teens.

Performance

One of the most highly praised virtues of the International Folkboat—as well as all its various relatives—is its performance under sail when the wind pipes up. While waves will come aboard offshore, in a stiff bay chop, the high surrounding bulwarks do a good job of keeping the cockpit surprisingly dry. There is no shortage of photos of International Folkboats (and Nordic Folkboats) shrugging off San Francisco’s famous winds with a single-reefed main. In such conditions, the jibsheet is often cross-sheeted and the two-man crew stays fairly high and dry on the windward rail.

The boat we sailed, Grateful Folk , is owned by Stephen McCormack, who uses it mostly for family daysails and local racing. McCormack, with a generous PHRF rating of 316, sailed the boat to first in the pocket-cruising division of the local racing fleet in 2009. Although the interior was a work in progress, the boat, overall, was in good shape given its age. The decks had been painted, the deck hardware was still in good condition, and apart from some minor pitting on the boom, the rig showed nothing worthy of serious concern. The loose-footed, partially battened mainsail and 120-percent genoa were basic cruising sails, typical of a family daysailer. Winds during our test sail on Sarasota Bay in Sarasota, Fla., were about 8-10 knots.

Grateful Folk was due for a bottom job, so we didn’t expect much from it in such light winds, but were pleasantly surprised. The boat did not, of course, accelerate in puffs like a modern fin-keeler, but it reacted positively to prolonged gusts. We were able to hold a steady 4.8 knots to windward, 5.5 knots reaching, and 5.2 knots deep-reaching off the wind. Unlike the Nordic Folkboat, the International Folkboat Class does allow for a spinnaker, although our boat was not equipped with one. In around-the-buoy races, McCormack is content to pole out the jib on downwind legs.

Tacking angles were precisely 45 degrees, although we would surely be able to aim higher in more wind. Three features struck us about the boat under sail. First was the ease with which the boat could be tacked and jibed singlehanded. Frank Costella, whose former boat, Espresso , is featured in John Vigor’s book “Twenty Small Sailboats to Take You Anywhere,” has many fond memories of sailing the boat by himself in a heavy breeze.

“I’d tuck right back there behind the traveller, with the jib cross-sheeted and watch the spray fly,” he said. “We put the windows under only a couple of times, but the cockpit rarely got very wet.”

Selling for about $10,000 on the used-boat market (if you can find them), the International Folkboat has four essential attributes that make for a good value. First, it has a long, mostly glowing history that ensures a loyal, almost cult-like following. Second, there are enough iterations of the class, particularly on the West Coast, that you can race and rally with a community of like-minded owners. Third, it is a very well-built boat for its size, with many features—like a quick-draining cockpit and monocoque hull—that inspire confidence off soundings. Finally, the boat is no longer being produced, so should you decide to resell your boat, you won’t be competing with a new boat market.

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