B&G Yacht Design

Boat Plans - Cabo Horn 40

Elegant sailboat for cruising with comfort and safety.

The Cabo Horn range of elegant cruising sailboat designs can accomplish the most radical of seafaring adventures with a degree of safeness and comfort seldom found in other sailboats of about the same size.

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The Cabo Horn 40 has increased safety factors applied to the structural design to support the harsher environments anyone can expect to endure in extreme sailing expeditions. But the Cabo Horn 40 isn’t brute force only. Her elegant round bilge hull lines and her sophisticate construction technique allows for a moderately light displacement yacht of exceptional seaworthiness and durability.

Technical Data

Length Overall

12.27 m (40’ 3”)

Length Waterline

10.40 m (34’ 1”)


4.08 m (13’ 5”)


1.85 m (6’ 1”)

Fixed Ballast

3,070kg (6,762 lb)


8,500 kg (18,722 lb)

Freshwater Tank Capacity

750 l (200 gal)

Fuel Tank Capacity

350 l (92 gal)

Standing Headroom – Saloon

2.10 m (6’ 10”)

Standing Headroom – Front Cabin

1.90 m (6’ 3”)

Headroom – Aft Cabin

.82 m (6’)

Sail Area

70.40 m2 (757 sq. ft.)

Auxiliary Propulsion

40 hp


Strip planking, cold moulded or fiberglass

List of Plans

CH40 – S0A – Full Size Patterns A

CH40 – S0B – Full Size Patterns B

CH40 – S0C – Full Size Patterns C

CH40 – S0D – Full Size Patterns D

CH40 – S0E – Full Size Patterns E

CH40 – S0F – Full Size Patterns F

CH40 – S0G – Full Size Patterns G

CH40 – S0H – Full Size Patterns H

CH40 – S0I – Full Size Patterns I

CH40 – S0J – Full Size Patterns J

CH40 – S0K – Full Size Patterns K

CH40 – S0L – Full Size Patterns L

CH40 – S1 – Lines Plan

CH40 – S2 – Mast and Sails

CH40 – S2B – Mast and Sails B

CH40 – S3 – Interior Layout

CH40 – S4A – Deck Layout

CH40 – S5A – Structural Plan

CH40 – S6A – Transverse Sections A

CH40 – S6B – Transverse Sections B

CH40 – S6C – Transverse Sections C

CH40 – S7 – Keel

CH40 – S8A – Longitudinal Section – Fwd

CH40 – S8B – Longitudinal Section – Aft

CH40 – S9 – Custom Fittings

CH40 – S10 – Rudder Bearings

CH40 – S11 – Transom Arch

Boat Description

Interior layout:

The Cabo Horn 40 has three cabins and two heads, being the aft cabin an ensuite. The spacious saloon layout is arranged along a raised floor level, allowing an optional second steering station under the trunk’s coach-roof. The sensation of comfort across the whole interior is a feature highly appreciated by all Cabo Horn 40 owners.

The interior layout is suited for five persons to sleep in three separate cabins. In case of need two more crewmembers will find room to sleep in the saloon using the settees as bunks.

The balance of accommodation comfort along all compartments of the yacht is a point to be considered when designing offshore cruising sailboats. In this respect the Cabo Horn 40 design fulfils its purpose of being an offshore expedition machine. A permanent crew of five, with the eventual addition of two more persons, can live aboard for long stretches without feeling the discomfort of cramped spaces. The fuel (350l) and fresh water (750l) tank capacity is intended for long range usage. Fresh water capacity can be increased indefinitely by installing a water maker.

Fore cabin: This cabin is fitted with two V-berths easily convertible into a double berth using a  removable trapeze-shaped bunk-board stored under the V-berths. With 1.90m (6’3”) headroom at the entrance hall, having a hanging locker and drawer furniture, it is suited to be used as a very comfortable guest cabin.

Single berth cabin: This spacious privative single berth cabin located at portside of the corridor is one of the features that fit the Cabo Horn 40 into the category of yachts for a crew of five to live aboard. Aired and illuminated by a hatch placed on the coach-roof and being provided with a cowl vent installed on top of a “dorade box”, this cabin is suited to be used by the off-watch crewmember.

The single berth cabin is provided with a lee cloth stored under the berth upholstery. The headroom over the floorboard exceeds 1.93m.

Fore corridor social head: This head with vanity counter, shower sump and toilet is the crew’s common head. Its ventilation and illumination are also provided by a hatch and a cowl vent with “dorade box” placed on the coach-roof.

Social saloon: The saloon is as cosy as it can be afforded in a forty foot yacht. Its layout consists of a U-shaped dinette placed at portside, having room for five adults to sit comfortably around its ample dining table, and a sofa at starboard facing the dinette, where four other adults can sit with room to spare. There are lockers and shelves placed behind the outer backrests at both sides of the saloon.

The Cabo Horn main saloon is that of a luxury yacht. Its layout is roomy enough to shelter ten adults in social parties without anybody feeling cramped there.

Another feature to be praised is the airiness and good natural illumination inside the saloon provided by the windows and hatches installed around the trunk’s walls. The 2.10m (6’10”) headroom also contributes for a pleasant atmosphere on board.

Navigation station and optional inside steering quarters: This compartment is the most complete navigation and piloting station that can be found in a forty-foot yacht. The counter faces forwards, allowing an optional steering wheel to be installed there, being also the best place to fix an internal multifunction monitor, or separate ones, if preferred. The navigation table placed at starboard of the pilot’s telescoping chair can be also a radio communication centre, and a working area, totally out of the way from the crew’s circulation. The navigation and radio communication station has ample possibilities of arrangements depending on the owner’s personal preferences.

Navigation station

Galley: The U-shaped galley is placed abaft the dinette. It is the most complete galley one may wish to have in a cruising sailboat. The gimballed four burners with oven stove is placed between two counters, the cook having an out of the way nook where every facility is within the reach of the arm. The U-shaped galley is an out-of-the-way place with all appliances being within the reach of an arm’s length, giving excellent protection for the cook when sailing in bad weather.

Ensuite aft cabin: One of the highlights of the project is its ensuite owner’s cabin. With the resource of building a bridge between the companionway hatch and the cockpit well it was possible to obtain 1.83m headroom along the passage that takes the crew from the cabin entrance hall to the private head. The other feature to be praised is the fact that the double berth can be accessed from its side, since there is a floorboard placed between the berth and the topside.

Lazarette: there is a huge space abaft the heads having access from the cockpit where spare sails, inflatable dinghy and other bulky equipment can be stored.

Deck layout:

 The Cabo Horn 40 project has the cabin trunk designed in two levels. The lower level extends forwards until reaching the fore cabin entrance hall. This style of cabin trunk, besides providing elegance to the design, it also gives a good support for the foot when the crew is required to go forwards, especially when the boat is heeled. The mast is stepped on the lower part of the cabin trunk coach-roof and is supported by a pillar integrated to the bulkhead that separates the saloon from the fore compartments.

The cockpit provides a feeling of safety with the seats being well protected by coamings.

The deckbridge abaft the companionway hatch is wide enough to allow a couple in a hot summer night using a foldable mattress spread over its area to sleep on it. It’s popular among Cabo Horn 40 owners to extend the dodger afterwards to give shelter to the bridge deck, leaving only a gap between the dodger and the Bimini to allow the main sheet to travel from side to side. The cockpit seats are well protected by coamings that work beautifully as back-rests. The wide boarding platform at the transom scoop is another source of comfort of the deck layout.

Spars, rigging and sails:

The Cabo Horn 40 is a mast-head sloop with two pairs of spreaders and a pair of lower shrouds at each side. This rig is simple and reliable, giving a feeling of confidence to the crew, especially in bad weather. The whole rigging and spars are conservatively dimensioned, and the moderate length of the mast transmits the impression of overwhelming safety. The sail area designed for cruising purposes and the lack of inner forestay make the Cabo Horn 40 an easy to be manoeuvred boat in any circumstances.

Keel and rudder:

The relatively shallow draught bulbous keel is a compromise between good stability and the capacity to navigate in areas where depth is insufficient for deep fin keel yachts. The oversized and over-dimensioned rudder fits also in the philosophy of ultimate cruising sailboats, affording an incomparable steering control, which is also submitted to comparatively small efforts, thanks to the excellent balance between sail area and lateral resistance.


The Cabo Horn 40 is primarily designed for wood/epoxy construction, either being built by the strip-planking over laminated frames construction method, or cold-moulded construction with no stringers. Alternatively, the boat can be built in composite sandwich, using PVC foam as core material, or yet in the traditional single-skin fibreglass construction.

The adoption of wood as first option of building material, as long as the wood employed has “green certificate”, does not represent a burden to the environment. Planted wood, besides being renewable, is the most efficient way of removing carbon dioxide from the atmosphere, and a wooden boat, except in the unthinkable case of being burnt, is a sure way of storing CO² in the form of cellulose. Nothing compares to wood in appearance and warmth, and besides it gives all the opportunities for a superb joinery work, the cosy inside lay-out bringing a great sensation of wellbeing and elegance. 

Boat Plans

Construction plans


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Study Plans


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