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1983 Prout 37 Snowgoose

Listed
Expired
$95,000 USD

Seller's Description

Prout Snowgoose Classic 37 Catamaran For Sale By Owner Location: Beaufort, NC Asking: $95,000 (USD) Duty Paid

S/V Kyrie is a 1983 Prout Snowgoose 37 Classic for sale by owner. Completely refit in 2003 and continuously updated since. The refit was incredibly thorough with new sails, rig (since replaced again), new engine, new insulated headliner, new diamond seaglaze exterior windows, new cockpit custom roof and solar. Prout Snowgoose 37 boats are renowned for their build quality, beachability, extremely shallow draft, short mast, and good sailing manners.

Specs

Designer
Prout
Builder
Prout & Sons
Associations
?
# Built
?
Hull
Catamaran
Keel
Twin
Rudder
?
Construction
FG

Dimensions

Length Overall
37 0 / 11.3 m
Waterline Length
33 0 / 10.1 m
Beam
?
Draft
?
Displacement
12,130 lb / 5,500 kg
Ballast
?

Rig and Sails

Type
Cutter
Reported Sail Area
570′² / 53 m²
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Air Draft
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
Yanmar
Model
?
HP
?
Fuel Type
diesel
Fuel Capacity
35 gal / 132 l
Engine Hours
?

Accomodations

Water Capacity
75 gal / 284 l
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
10.0 kn
Classic: 7.7 kn

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

9.98 knots
Classic formula: 7.7 knots
Sail Area/Displacement
17.3
16-20: good 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.
17.28
<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
150.6
100-200: light

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
150.56
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
14.7
<20: lightweight racing boat

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
14.72
<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
2.62
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Early hulls, which include molded stub keels, are solid fiberglass, while more recent versions are solid below the waterline and cored above.
A later version became the SNOWGOOSE ELITE (1986) had 1 foot more beam.
The SNOWGOOSE 37 (all iterations) was enormously popular with more than 500 built.

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