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Seller's Description

$53,950*, Complete Ready to Sail! *Will entertain REASONABLE offers.)

My Horizon 20 Catboat is for the sailor that wants a very low maintenance, safe, and easy to sail vessel. I am in my mid-70’s and worked closely with the Com-Pac factory to customize and build this boat to meet this very specific criteria, with special attention that the boat will be kept on a lift in St. Petersburg, FL next to our condominium. It is nice to have the luxury of specifying a newly built boat based on fifty years of sailing, and ownership experience of numerous vessels, including a 41’ pilothouse cutter that was custom built in the Far East.

My 2024 Horizon 20 was completed and just launched in November with the expectation that we would be able to utilize it for the next few years. However, personal circumstances change quickly at this age and we are relocating very soon to Sarasota, FL away from the water. This sadly necessitates selling this almost new boat which has only been used 6-7 times for short 1-2 hours sails in Tampa Bay. The boat met ALL of my expectations as it handles beautifully and is incredibly easy to sail single-handed.

My 2024 model year Horizon still has the manufacturers warranty until November, 2024 and the Suzuki Outboard manufacturers warranty is good until June, 2028! This is an exceptional opportunity for someone to purchase this almost new 2024 boat and motor at 20% off of the manufacturers list price, plus get $3,500 of custom boat lift components included for free that can alternately be used to modify/build a trailer.

2024 Com-Pac Horizon 20 Options (Hull #ABV20139G324) White Hull w/ Navy Blue Boot Top (Contact me for a detailed Options list!)


Halsey Herreshoff
Com-Pac Yachts
# Built
Stub + Centerboard


Length Overall
20 0 / 6.1 m
Waterline Length
17 8 / 5.4 m
8 4 / 2.6 m
2 1 / 0.7 m 2 3 / 0.7 m
2,500 lb / 1,134 kg
600 lb / 272 kg

Rig and Sails

Reported Sail Area
205′² / 19.1 m²
Total Sail Area
Sail Area
Air Draft
Sail Area
Forestay Length

Auxilary Power

Fuel Type
Fuel Capacity
Engine Hours


Water Capacity
10 gal / 38 l
Holding Tank Capacity


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.


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
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.


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.
<16: under powered
16-20: good performance
>20: high performance
<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.


Ballast / Displacement * 100

<40: less stiff, less powerful
>40: stiffer, more powerful
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.


D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
<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.


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
<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
>2.0: 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.


CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
<2: better suited for ocean passages
>2: better suited for coastal cruising


Inboard diesel optional.
Based on the earlier HERRESHOFF AMERICA.

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