Ski-Breeze

1957 — 1965
Designer
Jac. M. Iversen
Builder
Scandia Boatyard (SWE)
Association
Swedish Maritime Museum
# Built
100
Hull
Monohull Dinghy
Keel
Centerboard
Rudder
?
Construction
FG

Dimensions

Length Overall
18 3 / 5.6 m
Waterline Length
?
Beam
5 10 / 1.8 m
Draft
0 11 / 0.3 m 3 8 / 1.1 m
Displacement
750 lb / 340 kg
Ballast
?
• 1 / 1

Rig and Sails

Type
Sloop
Reported Sail Area
161′² / 15 m²
Total Sail Area
?
Sail Area
?
P
?
E
?
Air Draft
?
Sail Area
?
I
?
J
?
Forestay Length
?

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
?
Cabins
?

Hull Speed
?

Hull Speed

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Formula

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL

?
Classic formula: ?
Sail Area/Displacement
31.2
>20: high performance

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

Formula

SA/D = SA ÷ (D ÷ 64)2/3

• SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D: Displacement in pounds.
31.22
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
?

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Formula

Ballast / Displacement * 100

?
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
?

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet
?
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
?

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

• D: Displacement of the boat in pounds
• LWL: Waterline length in feet
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet
?
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
2.6
>2.0: better suited for coastal cruising

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

Formula

CSV = Beam ÷ ³√(D / 64)

• Beam: Width of boat at the widest point in feet
• D: Displacement of the boat in pounds
2.6
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Very early ‘power/sail hybrid’ from Sweden. The brainchild of Gusta Erikson.
One unique feature is the twin rudders with the outboard mount in between.
2 piece mast for ease of stowing.
This from Sara Erikson, daughter of the designer:
My father, Gusta (Gus) Erikson, designed and built the SkiBreeze, starting the production in 1957 and continuing until around 1965. The hulls were hand-made in our factory at Scandia Boatyard, Uddevalla, Sweden, and probably among the first fiberglass hulls to be built in Sweden. We had one of the first boats in this series and tested it for sailing, motoring and waterskiing - my father’s ambition was to have it multi-functional, but I always felt it was at it’s best under sail. We used to win sailing races all the time with it thanks to it’s ability to plane and because we could raise the centerboard and get through shallow passages where other boats couldn’t go.

According to Jay Mixter a number were orinally imported to the US (100?).
Drawings available at the Swedish Maritime Museum (Jac. Iversen Collection).

For Sale

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