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1974 Sparkman & Stephens 42

Listed
Expired
$99,000 USD

Seller's Description

Olin Stephens redesigned Finisterre’s hull for better performance and construction in fiberglass. Wright-Allied manufactured the design as their XL-2. Hull # 20 has been refitted with state-of-the-art subsystems, all new stainless steel and custom interior. 2014 Survey says value ~ $130K; replacement ~ $500K.

s/v SILKIE’s refinement into a self-sufficient live-aboard cruiser, focused on five categories:

Safety – New, stronger 28” tall stanchions & uncoated double life lines; 5 boarding gates facilitate multiple docking positions; radar arch, pushpit & solar panel frame form a unitary cage securing crew in big seas; mainsail rigging & traveler relocated from cockpit to cabin top; FurlBoom facilitates more reef combinations; new chainplates; ‘new generation’ ground tackle and premium windlass.

Comfort – ‘wall-to-wall’ cockpit cushions of open cell foam & fabric; cushioned helm seat; 7” X 16” S/S Rutgersen opening ports cool saloon; custom leather lounge chairs, re-designed settee cushions to provide positive lumbar support and knee rolls; cabin fans + Oceanaire hatch screens & shades.

Sustainability – Vacuum Insulating Panels used to convert icebox to keel cooled freezer & frig without water pumps; solar panels & wind generator augment alternator to recharge batteries away from shore power; custom tambour lockers stow cookware & months of foodstuffs; two 26-gal fuel tanks, plus a 6- gal jerry jug, permits nearly 40 hours of hull speed motoring.

Speed – folding KiwiProp; trailing edge of keel tapered; additional roach on mainsail; drifter and asymmetrical spinnaker. SILKIE’s shoal Keel/CB has proven completely reliable and PHRF New England assigns the design a base handicap of 138. She always surprises other cruising boats with her speed.

Electronics – Backstay SSB antenna and KISS counterpoise, Yaesu FT100D SSB radio; redundant depth sounders & GPS networked via dual NMEA streams; AIRMAR CS4500 ultrasonic speed transducer eliminates paddlewheel to report STW; Vesper Class B AIS transponder; dual data streams send nav data to B&G Zeus 12 plotter at helm and your computer running Coastal Explorer at nav table; B&G 4G solid state radar integrated with chartplotter; iAIS Wireless AIS Receiver & NMEA repeater broadcasts AIS, GPS and NMEA data to WiFi connected phones and tablets running Garmin Blue Chart Mobile or iNavX.

2014 ‘Valuation & Insurance Survey’ available on request, coxn.don@gmail.com. Price and payment terms are negotiable; all serious offers are welcome. Available for inspection in Annapolis MD, by appointment.

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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
?
Beam
?
Draft
4 2 / 1.3 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
?

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

This listing is presented by SailFarYachts.com. Visit their website for more information or to contact the seller.

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