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GET READY FOR WINTER!
Harken's DN Iceboat Sailboat Deck Layout and setup with blocks, tracks, and traveler cars.
Class History
Iceboating
With speeds hitting 50-100+ mph and your body suspended mere inches over the ice, iceboating is the fastest winter sport and one of the most intense sailing experiences there is. Speed generates more speed in iceboats—while "soft water" yachts eventually succumb to hull drag, nearly frictionless iceboats can use apparent wind to reach speeds 2 to 4 times the true wind.
The DN Iceboat
The DN, the smallest iceboat at 12 feet but the largest class, was first crafted by enthusiasts in the Detroit News' wood shop after it won the paper's 1936 design contest. Most of the 2000 members of the class build their own DN's, lending the boats to significant experimentation within the rules.
Mainsheet
The tapered mainsheet runs from a ratchet and two 75 mm Carbos to a 4:1 purchase. When building speed, the boom can be pulled tight against the skipper's shoulder because the purchase uses low-profile Carbo T2s and small, recessed boom blocks.
The Carbo Ratchets provide up to 15:1 holding power without compromising easing ability or chewing up lines.
Mainsheet Traveler
Fore-aft travelers with pinstop lead cars make it easy to adjust the sail. Pulling the cars forward pushes the boom into the mast, rotating the spar for a deeper pocket. Moving cars aft flattens the sail for speed in the upper wind range.
-Information courtesy from Harken
| Mfg No. | Description | Sheave Diameter |
Length | Max Line Diameter |
Max Working Load |
Breaking Load |
Weight |
| 2149 | T2 SingleA |
1-9/16" (40mm) |
2-1/4" (57mm) |
3/8" (10mm) |
485 Lbs (220kg) |
1,200 Lbs (544kg) |
0.9 oz. (25g) |
| Mfg No. | Description | Sheave Diameter |
Length | Max Line Diameter |
Max Working Load |
Breaking Load |
Weight |
| 2660 | Single Carbo Airblock | 2-15/16" (75mm) |
5-3/8" (137mm) |
9/16" (14mm) |
1213 Lbs (550kg) |
3,638Lbs (1650kg) |
6.9 oz. (195g) |
| Mfg No. | Description | Sheave Diameter |
Length | Shackle Pin Dia. |
Max Line Diameter |
MWL1 | Breaking Load |
Weight2 |
| 2670 | Single Carbo Ratchet Airblock |
2-15/16" (75mm) |
5-3/8" (137mm) |
1/4" (6mm) |
7/16" (12mm) |
750 Lbs (341kg) |
3,000 Lbs (1,361kg) |
8.0 oz (227g) |
| Mfg No. | Maximum Working Load |
Breaking Load |
Length | Width | Height | Weight |
| 450 | 350 Lbs (159kg) |
700 Lbs (318kg) |
2-5/8" (67mm) |
15/16" (23mm) |
1-1/16" (27mm) |
2 oz. (55g) |
| Mfg No. | Fasteners | Mounting Hole Spacing | Length | First Hole | Weight |
| 453.12 | #10 FH in 5FH mm |
3" 76mm |
0.3m |
1-3/8" (34mm) |
1.5 oz. (43g) |
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FEATURED CLASS
DN Iceboat
A DN Iceboat is a small, one-design racing sailboat specifically engineered for ice sailing. Characterized by its lightweight construction and sleek design, the DN is known for its impressive speed and agility on frozen surfaces. With its distinctive triangular sail and runners (skates) for gliding over ice, the DN offers an exhilarating sailing experience, drawing competitors from around the globe to ice sailing regattas. The DN iceboat is celebrated not only for its performance but also for its community and spirit of competition, making it a favorite among ice sailing enthusiasts worldwide.
Design History
The DN iceboat was developed in the early 1960s by a group of sailors in the United States, primarily as a response to the need for a standardized, competitive iceboat class. The first DN was designed by the American sailor and ice boating enthusiast, Harold "Bud" L. Schultheis. Its design quickly gained popularity due to its simple construction, excellent performance, and affordability compared to other iceboats. The DN class has since evolved, with many updates in materials and technology, but the original dimensions and concept have been preserved to maintain competitive integrity. Today, the DN class is recognized internationally, with strong participation in championships and events.
Specifications
- Length Overall (LOA): 14 ft (4.27 m)
- Beam: 5 ft (1.52 m)
- Draft: 6 in (0.15 m) (with skates)
- Sail Area: 75 sq ft (7.0 m²)
- Sail Type: Triangular, with a typical aspect ratio
- Weight: Approximately 90-100 lbs (40-45 kg)
- Hull Material: Typically made from wood or composite materials; modern designs often use fiberglass or carbon fiber for reduced weight and increased durability.
- Runners (Skates): Made of high-carbon steel, often with a sharpened edge for improved performance on ice.
- Steering Mechanism: A tiller controls the rudder for navigation.
- Rigging: The DN features a simple rigging system with a single mast and no stays, allowing for easy assembly and disassembly.
- Transport: The boat can be easily disassembled for transport, with the hull, runners, and sail stowed in a compact configuration.
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