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2010 Cape Cod Shipbuilding Bullseye

Expired
$11,000 USD

Seller's Description

Ideal boat for family wishing to teach sailing skills. Lightly sailed by owner in late ’70s. Stable full keel with lead ballast. Class boat having an active racing group. Stored inside, current boat & trailer registration.

Equipment: 2 HP Honda engine, mainsail, 150 genoa, self-tending working jib, topping lift, boomvang, cockpit cushions, cockpit cover, swim ladder, fenders, anchor with rode and EZ Haul trailer.

Specs

Designers
Nathaniel G. Herreshoff
A. Sidney DeWolf Herreshoff
Builders
Quincy Adams Yacht Yard
Herreshoff Mfg. Co.
Cape Cod Shipbuilding
Associations
Bullseye Class Association
Herreshoff Marine Museum
# Built
?
Hull
Monohull
Keel
Long
Rudder
Transom hung
Construction
Wood/FG

Dimensions

Length Overall
15 8 / 4.8 m
Waterline Length
51 6 / 15.7 m
Beam
19 0 / 5.8 m
Draft
7 10 / 2.4 m
Displacement
1,350 lb / 612 kg
Ballast
750 lb / 340 kg (Lead)

Rig and Sails

Type
Sloop
Reported Sail Area
140′² / 13 m²
Total Sail Area
155′² / 14.4 m²
Mainsail
Sail Area
104′² / 9.7 m²
P
19 3 / 5.9 m
E
10 9 / 3.3 m
Air Draft
?
Foresail
Sail Area
51′² / 4.7 m²
I
16 11 / 5.2 m
J
6 0 / 1.8 m
Forestay Length
18 0 / 5.5 m

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?
Engine Hours
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
4.9 kn
Classic: 4.74 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

4.93 knots
Classic formula: 4.74 knots
Sail Area/Displacement
18.4
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.
18.35
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
55.6
>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

55.56
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
306.0
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
305.98
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
14.6
<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
14.64
<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
2.1
>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
2.11
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Originally designed and built by Nat Herreshoff of wood in 1914 and called the HERRESHOFF BULL’S EYE. In 1938 she was modified with an above transom tiller, and named The FISHERS ISLAND SOUND BULL’S EYE.
In 1947 the rights to the design were purchased by Cape Cod Shipbuilding Co.
In 1949 a fiberglass version of the FISHERS ISLAND SOUND BULL’S EYE was introduced (overseen by Sidney Herreshoff) that also featured a cuddy cabin and modern marconi rig on an aluminum spar. This became the THE CAPE COD BULL’S EYE. (pictured here)
Throughout the evolution of different decks and rigs, the hull design has remained unchanged from the original first built at Herreshoff Mfg. Co.

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