Knutson 35 Sloop (K 35)
Description
The Knutson 35 (also known as the K-35) is an American wooden auxiliary sloop designed by Sparkman & Stephens (S&S design number 1727, a classic from the post-WWII era) and built by Thomas Knutson Shipbuilding Corp. in Huntington, New York, USA, starting in 1955. Constructed primarily in wood (mahogany planking over oak frames) for high-quality craftsmanship, it features a fin keel with spade rudder for balanced handling, a fractional sloop rig for efficient performance, and a reputation as one of S&S's finest mid-sized designs—emphasizing seaworthiness, comfortable motion, and capable cruising/racing potential (e.g., suitable for coastal or occasional offshore use). The interior offers good accommodations for its era (berths for 4–6, galley, head), with a focus on solid build quality rather than speed extremes. Production was limited (dozens of hulls built in the 1950s–1960s), making surviving examples rare and valued as wooden classics (often restored, with some converted to yawl rigs or refitted for modern use).
Construction Details
| Designer | Sparkman and Stephens |
|---|---|
| Builder | Thomas Knutson Shipbuilding Corp. (NY) |
| Length | 35.000 ft |
| LOA | 35.000 ft |
| LWL | 25.000 ft |
| Beam | 9.830 ft |
| Displacement | 17000 lb |
| Max Draft | 5.000 ft |
| Year Built | 1955 |
The standard boat dimensions
| i | 41 ft |
|---|---|
| j | 13 ft |
| p | 42.25 ft |
| e | 17.25 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 41 ft | 13 ft | 42.25 ft | 17.25 ft | - | - | - | - |
Sails
Knutson 35 Sloop (K 35) - MAINSAIL
| Luff | * 42.25 ft - (12878 mm) |
|---|---|
| Foot | * 17.25 ft - (5258 mm) |
| Leech | * 44.89 ft - (13682 mm) |
| Tack Angle | * 88.02 ° |
| Diagonal | * 45.08 ft - (13740 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | 364.02 ft² |
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Knutson 35 Sloop (K 35) - JIBSAIL
| Luff | * 34.41 ft - (10488 mm) |
|---|---|
| Foot | * 17.19 ft - (5240 mm) |
| Leech | * 29.92 ft - (9120 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 14.95 ft - (4557 mm) |
| Deck Angle | * 12 ° |
| Area | 257.16 ft² |
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Knutson 35 Sloop (K 35) - GENOA
| Luff | * 40.86 ft - (12454 mm) |
|---|---|
| Foot | * 20.97 ft - (6392 mm) |
| Leech | * 38.45 ft - (11720 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 19.5 ft - (5944 mm) |
| Deck Angle | * 4 ° |
| Area | 398.33 ft² |
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Knutson 35 Sloop (K 35) - SPINNAKER
| Stays | * 40.86 ft - (12454 mm) |
|---|---|
| MidGirth | * 23.4 ft - (7132 mm) |
| Foot | * 23.4 ft - (7132 mm) |
| Perc LP | * 180 % |
| Area | 812.71 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.