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Seller's Description

Horizon Cat,2006 Factory custom. Excelent condition! Catboat gaff rig with aluminum spars. LOA 20 ft, Beam 8 ft 4 in, Draft 2 ft 2 in with board up, 5 ft board down. Folding mast (Mastendr) quick rig sailing system. Stainless mooring bit on foredeck. Teak bowsprit with anchor roller. Bruce anchor with rode. Wheel steering (custom teak). Kick-up foiled rudder (new hinge bushings 2019). Main sail (Doyle) with two reef points excellent condition (still crisp) with lazyjacks. 2 Anderson 12ST single speed self-tailing winches. 2 triple line rope clutches on cabin top. 2 triple line deck line organizers on cabin top. Running rigging: 2 halyards (peak and throat), downhaul, one for each reefpoint clew and mast raising system (all led to cockpit). Main sheet, dual ended, excellent condition. Out hall lines for full main and each reef point rigged on boom, excellent condition. Lower bobstay bracket replaced with newer (heavier design). Awlgrip topsides paint (burgundy), great condition. Exterior Teak bright work in great condition. Teak hand rail cabin top. Teak floor grating. Center board control line and cleat located in cockpit. Full nav lights (sail and steaming). Inboard diesel engine with controls and instrumentation. Depth finder. Boarding ladder, folding, stainless steel. Canvas covers, bimini (with boot), sail, wheel, boom gallows, full size mooring and hatch boards. Bilge pump with manual/off/auto control switch.

Equipment: Lots of stuff. Will provide additional details upon request.

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Specs

Designer
Halsey Herreshoff
Builder
Com-Pac Yachts
Associations
?
# Built
?
Hull
Monohull
Keel
Stub + Centerboard
Rudder
?
Construction
FG

Dimensions

Length Overall
20 0 / 6.1 m
Waterline Length
17 8 / 5.4 m
Beam
8 0 / 2.4 m
Draft
2 1 / 0.7 m 2,460 0 / 749.8 m
Displacement
2,500 lb / 1,134 kg
Ballast
600 lb / 272 kg

Rig and Sails

Type
Gaff-Cat
Reported Sail Area
205′² / 19.1 m²
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Air Draft
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
Yanmar
Model
?
HP
7
Fuel Type
Diesel
Fuel Capacity
?
Engine Hours
?

Accomodations

Water Capacity
10 gal / 38 l
Holding Tank Capacity
?
Headroom
?
Cabins
1

Calculations

Hull Speed
6.7 kn
Classic: 5.65 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

6.7 knots
Classic formula: 5.65 knots
Sail Area/Displacement
17.8
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.
17.81
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
24.0
<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

23.99
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
199.6
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
199.6
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
12.4
<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
12.36
<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
2.5
>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
2.46
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Inboard diesel optional.
Based on the earlier HERRESHOFF AMERICA.

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