International Folkboat 28
Description
The International Folkboat 28 (also known as the IF-Boat or Iversen 28) is a 27 ft 9 in (8.46 m) fiberglass long-keel cruiser-racer designed in 1966–67 by Norwegian-Danish naval architect Eric Iversen as a modern, roomier GRP evolution of the iconic wooden Nordic Folkboat, retaining the classic narrow beam (7 ft 4 in / 2.24 m), graceful sheer, and full keel (or optional fin keel) while adding a small coachroof, 4–5 berths, modest headroom, and a practical fractional rig with 290 ft² (27 m²) of sail. Built primarily by BB-Yachten/Biel Yachts in Denmark (and a few licensees in Sweden and Germany) from 1968 to the mid-1970s with around 300–350 hulls produced, the IF-Boat combines the legendary seakeeping and windward ability of the original Folkboat with significantly improved interior volume and easier maintenance, making it a beloved coastal cruiser and club racer throughout Scandinavia, Germany, and the UK.
Construction Details
| Designer | Eric Iversen |
|---|---|
| Builder | BB-Yachten/Biel Yachts |
| Length | 28.000 ft |
| LOA | 26.440 ft |
| LWL | 22.970 ft |
| Beam | 7.640 ft |
| Displacement | 3968 lb |
| Max Draft | 3.410 ft |
The standard boat dimensions
| i | 30.33 ft |
|---|---|
| j | 9.71 ft |
| p | 34.44 ft |
| e | 14.12 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 30.33 ft | 9.71 ft | 34.44 ft | 14.12 ft | - | - | - | - |
Blueprints
Sails
International Folkboat 28 - MAINSAIL
| Luff | * 34.44 ft - (10497 mm) |
|---|---|
| Foot | * 14.12 ft - (4304 mm) |
| Leech | * 36.48 ft - (11119 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 36.76 ft - (11204 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | * 250.58 ft² |
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International Folkboat 28 - JIBSAIL
| Luff | * 25.48 ft - (7766 mm) |
|---|---|
| Foot | * 12.87 ft - (3923 mm) |
| Leech | * 22.12 ft - (6742 mm) |
| Percentage LP | * 115.04 % |
| Length Perpendicular | * 11.17 ft - (3405 mm) |
| Deck Angle | * 12.01 ° |
| Area | * 142.34 ft² |
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International Folkboat 28 - GENOA
| Luff | * 30.25 ft - (9220 mm) |
|---|---|
| Foot | * 15.68 ft - (4779 mm) |
| Leech | * 28.44 ft - (8669 mm) |
| Percentage LP | * 149.95 % |
| Length Perpendicular | * 14.56 ft - (4438 mm) |
| Deck Angle | * 4.03 ° |
| Area | * 220.22 ft² |
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International Folkboat 28 - DRIFTER
| Luff | 28.87 ft - (8800 mm) |
|---|---|
| Foot | 16.42 ft - (5005 mm) |
| Leech | 27.5 ft - (8382 mm) |
| Perc LP | * 157.36 % |
| Length Perp | * 15.28 ft - (4657 mm) |
| Deck Angle | * 3.71 ° |
| Area | * 220.59 ft² |
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International Folkboat 28 - ASYMMETRICAL
| Luff | * 30.25 ft - (9220 mm) |
|---|---|
| Foot | * 16.02 ft - (4883 mm) |
| Leech | * 27.83 ft - (8483 mm) |
| Perc LP | * 165 % |
| Area | * 363 ft² |
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International Folkboat 28 - SPINNAKER
| Stays | * 30.25 ft - (9220 mm) |
|---|---|
| MidGirth | * 17.48 ft - (5328 mm) |
| Foot | * 17.48 ft - (5328 mm) |
| Perc LP | * 180 % |
| Area | * 449 ft² |
| Edit in Calculator | |
Disclaimer. Boats are not all the same -- even when produced in the same factory of the same model. Sailrite does its best to publish accurate dimensions, but we often find it worthwhile to have our customers measure their boats carefully before we produce kits for them. You should take the same precautions, especially when the data is not from Sailrite. The information on this site is not guaranteed to be accurate. Sailrite offers this content as a service to our community, but takes no responsibility for the reliability of the data provided.