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1970 37' Nautor Swan Swan 37 by Sparkman & Stephens

Expired
$99,000 USD

Seller's Description

Dulcinea is hull 17 of the 37 Swan that dominated ocean racing in 1970-71. With her pronounced tumblehome and low windage profile, Dulcinea is a beautiful Sparkman & Stephens design with Nautor heirloom quality. She has the classic S&S lead fin keel and skeg rudder that provides excellent upwind performance and fast, sea kindly passage making. Her provenance is well-known and documented. She has been in the fresh water U.S. Great Lakes since 1984. Since 2000 she has been extensively upgraded by her current owner for shorthanded sailing, including a Dacron mainsail by North Sails (new 2019), North Marathon 3DL #1 genoa (2016), North asymmetrical spinnaker (2007), two pairs of self-tailing chromed bronze primary winches (one pair at the helm) and four chromed bronze self-tailing halyard winches, boom with three (3) reefs & new gooseneck (2002), all new Type 316 stainless standing rigging (2002), all new running rigging (2007-2019), massive below-deck Raymarine hydraulic autopilot (2003) with backup (2017), end-boom sheeting to a Harken traveler (2006), all new AC, DC, coax, and instrument wiring (2004-2019), five batteries (2015-2017), Balmar high-output alternator (2012) and smart regulator (2009), Raymarine ST60 instruments (2000-2010), lifelines (2002), 3-blade feathering MaxProp (2006), Ultrasuede upholstery (2017). No teak decks. And the list goes on….Lying Chicago.

Equipment: Text me or email me with your email address for a copy of the full list of the upgrades accomplished since 2000.

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Specs

Designer
Sparkman & Stephens
Builder
C&C Fiberglass Components
Associations
?
# Built
?
Hull
Monohull
Keel
Fin + Bulb
Rudder
Spade
Construction
FG

Dimensions

Length Overall
30 6 / 9.3 m
Waterline Length
37 0 / 11.3 m
Beam
10 0 / 3.1 m
Draft
2 0 / 0.6 m
Displacement
5,640 lb / 2,558 kg
Ballast
2,400 lb / 1,089 kg (Lead)

Rig and Sails

Type
Sloop
Reported Sail Area
460′² / 42.7 m²
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Air Draft
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
Yanmar
Model
2YM15
HP
14
Fuel Type
Diesel
Fuel Capacity
12 gal / 45 l
Engine Hours
?

Accomodations

Water Capacity
13 gal / 49 l
Holding Tank Capacity
?
Headroom
?
Cabins
3

Calculations

Hull Speed
9.7 kn
Classic: 7.03 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

9.74 knots
Classic formula: 7.03 knots
Sail Area/Displacement
23.2
>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.
23.23
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
42.6
>40: stiffer, more powerful

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

42.57
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
121.1
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
121.14
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
18.4
<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
18.38
<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
1.9
<2.0: better suited for ocean passages

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
1.85
<2: better suited for ocean passages
>2: better suited for coastal cruising

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