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1976 Cabo Rico Tiburon 36 Ketch Price Drop


Seller's Description

I bought this boat a little over a year ago planning to sail the east coast and Caribbean. I have been living aboard for that time. The boat has everything needed for living aboard and is perfectly capable of sailing around the world. Health issues are forcing me to change my plans.

  • Enclosed cockpit for comfort and protection.
  • All sails furling with lines led back to cockpit for easy solo sailing.
  • Hydraulic steering with Raymarine autopilot.

The center cockpit contains a bucket helm seat on the port side to provide comfort while steering. The floor of the cockpit can be removed to provide full access to the engine directly below. The cockpit is enclosed by a hard top aluminum frame pilot house with fabric side screens. Canvases are included for wet weather or for bug screen in dry weather.

The boat is set up for solo sailing with most lines led back to the cockpit. The head sail and stay sail are on Harken single line drum furlers. The main and mizen sails are also on Harken furlers mounted on custom designed brackets attached to the mast. This greatly simplifies single handed sailing and reefing. The previous owner sailed up and down the east coast and as far as the Dominican Republic in the Caribbean and claimed good offshore performance for this rig.

Equipment: * Engine: 55HP Yanmar 4JH2E 2339 Hours * Water: Three tanks Front-25gal, Rear-60gal, Middle-20gal * Diesel: Two tanks 75gal each * Anchors: Delta Fastset 44lb; CQR 44lb * Pilothouse cockpit with canvas screens * All sails on Harken Roller furlers * Raymarine P70 Autopilot * Raymarine i70 Depth * Digital Yacht AIS * Cobra Marine MRF45-D radio with DSC * ZAR Mini 8W RIB dinghy * Johnson 2HP Outboard * Johnson 4 Delux 4HP Outboard (needs repair) * Four 100W Solar Panels with MPPT controller * Four Deep Cycle Lead Acid Batteries - 467AH * 1000W Jupiter Inverter * Force10 3-burner stove with oven * ICECO JP50 52Qt AC/12V Fridge Freezer * Extra deep sink * SSB Back Stay Antenna with Isolators * TCL Roku 32” TV with LG Blueray player * Smoke & Carbon Monoxide Detector * Emergency Tiller * Head with macerator pump & 5gal holding tank * Hand held Shower with dedicated sump pump * Spares: sails, starter, alternator, pumps, inverter, etc.. * USCG Documented



William Crealock
# Built


Length Overall
36 2 / 11 m
Waterline Length
29 3 / 8.9 m
11 5 / 3.5 m
4 11 / 1.5 m
21,000 lb / 9,525 kg
7,000 lb / 3,175 kg

Rig and Sails

Reported Sail Area
960′² / 89.2 m²
Total Sail Area
Sail Area
Air Draft
Sail Area
Forestay Length

Auxilary Power

Fuel Type
Fuel Capacity
Engine Hours


Water Capacity
Holding Tank Capacity


Hull Speed
7.1 kn
Classic: 7.25 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

7.08 knots
Classic formula: 7.25 knots
Sail Area/Displacement
>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.


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
>350: ultraheavy

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
40-50: heavy bluewater 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 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.


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


In 1976 the molds were adapted to produce the CABO RICO 38 (aft cockpit).

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