Sigma 400
Description
The Sigma 400 is a 40-foot masthead sloop designed by Rob Humphreys and built by Marine Projects Ltd. (Sigma Yachts) in Plymouth, UK, with production starting in 1990. It represents one of the later and larger models in the Sigma lineup (following the David Thomas–designed boats like the Sigma 29, 33, and 33C), aimed at fast cruising with capable racing potential. Exact production numbers are not widely published and appear to be relatively low (likely under 50 boats, as it was a short-run model near the end of Sigma’s independent production before the merger with Moody around 1988–1993 and cessation shortly after). The boat features solid fiberglass construction, a fin keel with spade rudder, and a practical yet performance-oriented layout suitable for offshore passages or club racing, with owners praising its power, fun handling, and good accommodation (including an aft double cabin).
Construction Details
| Designer | Rob Humphreys |
|---|---|
| Builder | Marine Projects Ltd. (UK) |
| Length | 40.000 ft |
| LOA | 40.270 ft |
| LWL | 33.330 ft |
| Beam | 12.760 ft |
| Displacement | 19000 lb |
| Max Draft | 7.500 ft |
| Year Built | 1990 |
The standard boat dimensions
| i | 48.88 ft |
|---|---|
| j | 14.27 ft |
| p | 51.84 ft |
| e | 18.86 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 48.88 ft | 14.27 ft | 51.84 ft | 18.86 ft | - | - | - | - |
Sails
Sigma 400 - MAINSAIL
| Luff | * 51.84 ft - (15801 mm) |
|---|---|
| Foot | * 18.86 ft - (5749 mm) |
| Leech | * 54.37 ft - (16572 mm) |
| Tack Angle | * 87.99 ° |
| Diagonal | * 54.54 ft - (16624 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | 488.37 ft² |
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Sigma 400 - JIBSAIL
| Luff | * 40.74 ft - (12418 mm) |
|---|---|
| Foot | * 18.63 ft - (5678 mm) |
| Leech | * 35.89 ft - (10939 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 16.41 ft - (5002 mm) |
| Deck Angle | * 12 ° |
| Area | 334.26 ft² |
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Sigma 400 - GENOA
| Luff | * 48.37 ft - (14743 mm) |
|---|---|
| Foot | * 22.82 ft - (6956 mm) |
| Leech | * 45.78 ft - (13954 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 21.41 ft - (6526 mm) |
| Deck Angle | * 4 ° |
| Area | 517.74 ft² |
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Sigma 400 - SPINNAKER
| Stays | * 48.37 ft - (14743 mm) |
|---|---|
| MidGirth | * 25.69 ft - (7830 mm) |
| Foot | * 25.69 ft - (7830 mm) |
| Perc LP | * 180 % |
| Area | 1056.23 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.
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