The Sweden Yachts 390 Sailboat
Specs & Key Performance Indicators

The Sweden Yachts 390, an aft cockpit sloop, was designed by Peter Norlin and built by Sweden Yachts.

A Sweden Yachts 390

Published Specification for the Sweden Yachts 390

Underwater Profile: Fin keel & spade rudder

Hull Material: GRP (Fibreglass)

Length Overall: 39'0" (11.9m)

Waterline Length: 31'6" (9.6m)

Beam: 12'9" (3.9m)

Draft: 7'4" (2.3m)*

Rig Type: Masthead sloop

Displacement: 16,755lb (7,600kg)

Designer: Peter Norlin

Builder: Sweden Yachts

Year First Built: 1991

Year Last Built: 1998

Number Built: 47

* Shoal draft version also produced drawing 5'9" (1.8m)

Published Design Ratios for the Sweden Yachts 390

1. Sail Area/Displacement Ratio: 18.6

Less than 16 would be considered under-powered;
16 to 20 would indicate reasonably good performance;
Over 20 suggests relatively high performance.

2. Ballast/Displacement Ratio: 41.4

Under 40: less stiff, less powerful
Over 40: stiffer, more powerful

3. Displacement/Length Ratio: 239

Under 100: Ultralight
100 to 200: Light
200 to 275: Moderate
275 to 350: Heavy
Over 350: Ultraheavy

4. Comfort Ratio: 26.0

Under 20 indicates a lightweight racing boat
20 to 30 indicates a coastal cruiser
30 to 40 indicates a moderate offshore cruising boat
40 to 50 indicates a heavy offshore boat
Over 50 indicates an extremely heavy offshore boat

5. Capsize Screening Formula: 1.9

Under 2.0 (the lower the better): Better suited for ocean passages
Over 2.0: Less suited for ocean passages

Summary Analysis of the Design Ratios for the Sweden Yachts 390

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1. A Sail Area/Displacement Ratio of 18.6 suggests that the Sweden Yachts 390 will, in the right conditions, approach her maximum hull speed readily and satisfy the sailing performance expectations of most cruising sailors.

2. A Ballast/Displacement Ratio of 41.4 means that the Sweden Yachts 390 will stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 239, tells us the Sweden Yachts 390 is a moderate displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance. Most of today's sailboats intended for offshore cruising fall into this displacement category.

4. Ted Brewer's Comfort Ratio of 26.0 suggests that crew comfort of a Sweden Yachts 390 in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not encouraging news for anyone prone to seasickness.

5. The Capsize Screening Formula (CSF) of 1.9 indicates that a Sweden Yachts 390 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.