# International Folkboat

1967
Designer
Tord Sundén
Builder
Marieholm Boats
Association
Folkboat (International)
# Built
3000
Hull
Monohull
Keel
Long
Rudder
Transom hung
Construction
FG

### Dimensions

Length Overall
25 9 / 7.9 m
Waterline Length
19 9 / 6 m
Beam
7 2 / 2.2 m
Draft
3 11 / 1.2 m
Displacement
4,740 lb / 2,150 kg
Ballast
2,750 lb / 1,247 kg
• 1 / 1

### Rig and Sails

Type
Sloop
Reported Sail Area
267′² / 24.8 m²
Total Sail Area
267′² / 24.8 m²
Sail Area
170′² / 15.8 m²
P
28 8 / 8.8 m
E
11 9 / 3.6 m
Air Draft
?
Sail Area
97′² / 9 m²
I
23 5 / 7.2 m
J
8 3 / 2.5 m
Forestay Length
24 10 / 7.6 m

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?

### Accomodations

Water Capacity
?
Holding Tank Capacity
?
?
Cabins
?

Hull Speed
6.4 kn
Classic: 5.97 kn

### Hull Speed

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.

Formula

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

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

6.43 knots
Classic formula: 5.97 knots
Sail Area/Displacement
15.1
<16: under powered

### 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.

Formula

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.
15.14
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
58.0
>40: stiffer, more powerful

### 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.

Formula

Ballast / Displacement * 100

58.0
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
271.9
200-275: moderate

### 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.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet
271.93
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
24.4
20-30: coastal cruiser

### 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.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

• D: Displacement of the boat in pounds
• LWL: Waterline length in feet
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet
24.35
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
1.7
<2.0: better suited for ocean passages

### 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.

Formula

CSV = Beam ÷ ³√(D / 64)

• Beam: Width of boat at the widest point in feet
• D: Displacement of the boat in pounds
1.71
<2: better suited for ocean passages
>2: better suited for coastal cruising

### Notes

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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