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1981 Precision Boat Works Seaforth 24

Listed
Expired
$6,100 USD

Seller's Description

Excellent sea boat with trailerable shallow draft (2.5) and reliable inboard diesel auxiliary. She comes fully equipped with a full set of sails in good condition: main, Genoa, working jib, and cruising spinnaker which flies from the bowsprit. The Yanmar inboard burns approximately 1/3 gal. per hour at 5knts from a 7gal tank. She sleeps two very comfortably, but as a family of 5, it’s time to move to something with more berths.

Note that while the boat is readily trailerable (see photo), I keep it in the water in Urbanna and do not have a trailer for it at present.

Equipment: varnished butterfly foredeck hatch for greatly increased ventilation (also looks nautical) 20gal freshwater tank with electric pump for pressurized cockpit showers New electrical panel, house battery (2022), starting battery (2023), automatic charging relay, and solar panel to keep up the charge while youre away Simrad tiller pilot (2023) makes longer voyages relaxed. The second battery means no worries about running the pilot too long. Stack pack mainsail cover for simplicity New memory foam mattresses below 5 thick, very comfortable Proper bronze Wilcox-Crittenden marine head new bilge pump, panel, and float switch with Whale manual backup in cockpit led running lights compact galley with icebox, sink, and butane stove Fortress anchor with 20 chain and 150 rode (2022) New fuel gauge. Tach works but sticks a bit so new one in box ready to install New Plastimo bulkhead compass Bulkhead usb-c charger with voltage gauge (I once worked abroad for a week without charging the batteries, it powers Mac laptops) Full cloth winter cover

Specs

Designer
Stephen Seaton
Builder
Precision Boat Works
Associations
?
# Built
?
Hull
Monohull
Keel
Long
Rudder
Transom hung
Construction
FG

Dimensions

Length Overall
24 0 / 7.3 m
Waterline Length
16 11 / 5.2 m
Beam
7 4 / 2.3 m
Draft
2 5 / 0.8 m
Displacement
4,200 lb / 1,905 kg
Ballast
1,600 lb / 726 kg

Rig and Sails

Type
Sloop
Reported Sail Area
208′² / 19.3 m²
Total Sail Area
208′² / 19.4 m²
Mainsail
Sail Area
116′² / 10.8 m²
P
21 9 / 6.7 m
E
10 7 / 3.3 m
Air Draft
?
Foresail
Sail Area
92′² / 8.5 m²
I
24 6 / 7.5 m
J
7 6 / 2.3 m
Forestay Length
25 7 / 7.8 m

Auxilary Power

Make
Renault
Model
RC8D
HP
?
Fuel Type
Diesel
Fuel Capacity
?
Engine Hours
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
1

Calculations

Hull Speed
5.4 kn
Classic: 5.52 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

5.36 knots
Classic formula: 5.52 knots
Sail Area/Displacement
12.8
<16: under powered

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.
12.78
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
38.1
<40: less stiff, less 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

38.11
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
382.0
300-400: heavy

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
381.98
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
23.8
20-30: coastal cruiser

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
23.83
<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
1.8
<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
1.81
<2: better suited for ocean passages
>2: better suited for coastal cruising

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