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Sailboat Specifications

First 405 Beneteau

Masthead Sloop · Fin W/Spade Rudder

Designed by Jean Berret · Built by Beneteau (Fra) · First built 1986

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LOA 40.67 ft  ·  Beam 12.75 ft  ·  Displacement 18,500.00 lb  ·  Sail Area 681  ·  Masthead Sloop  ·  Fin W/Spade Rudder
About the First 405 Beneteau Sailboat

Launched in 1986, this Jean Berret-designed performance cruiser represents Beneteau's successful First series, which helped establish the French builder's reputation for combining racing-inspired design with practical cruising capabilities. The First 405 strikes an appealing balance between speed and comfort, making it well-suited for coastal cruising, club racing, and occasional offshore passages. The boat's fin keel and spade rudder configuration, combined with a relatively light displacement of 18,500 pounds, delivers responsive handling and good sailing performance. With a masthead sloop rig and moderate beam of 12.75 feet, the design prioritizes sailing efficiency over maximum interior volume. The 7.20-foot draft provides excellent upwind performance while still allowing access to most cruising destinations. Jean Berret's design philosophy shines through in the boat's clean lines and purposeful proportions. The ballast-to-displacement ratio of over 40 percent ensures solid stability, while the comfort ratio of 26.01 indicates a motion that favors performance over pure comfort in heavy seas. This makes the First 405 particularly appealing to sailors who want a boat that sails well first and foremost, yet still offers adequate accommodations for extended cruising adventures.

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The balsa core used in the deck of late 1980s Beneteau production boats, including the First 405, is prone to water saturation around deck hardware and chainplate areas. Once wet, the balsa loses structural integrity and soft spots develop that are costly to repair.
1986–1992 production
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The fin keel on the First 405 is attached via a series of keel bolts that pass through a relatively shallow sump. These bolts are prone to weeping and corrosion, and the tabbing around the keel stub inside the bilge is known to crack on boats that have been sailed hard or grounded. Inspect carefully for rust staining and movement.
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The First 405 uses a fractional rig with a relatively flexible mast section. The compression post below the mast step bears heavily on the interior liner rather than a true structural bulkhead in some configurations; check for cracking or distortion of the liner in this area.
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Dimensions & Specifications
LOA (Length Overall) 40.67 ft / 12.40 m
LWL (Waterline Length) 35.50 ft / 10.82 m
Beam 12.75 ft / 3.89 m
Max Draft 7.20 ft / 2.19 m
Displacement 18,500.00 lb / 8,391 kg
Ballast 7,694.00 lb / 3,490 kg
Sail Area (Reported) 681
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Jean Berret
Builder Beneteau (FRA)
First Built 1986
Related Sailboats Tartan 412 · Cc 41 · Schock 41 · Irwin 41 Citation · Banner 41
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Engine & Accommodations
Engine Make Perkins
Engine Model 4108
Engine Type Diesel
Fuel Capacity 24 gals / 91 L
Water Capacity 106 gals / 401 L
Frequently Asked Questions

What is the First 405 Beneteau's sail area to displacement ratio?

The First 405 Beneteau has a Sail Area to Displacement ratio (SA/D) of 15.64. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the First 405 Beneteau's comfort ratio?

The First 405 Beneteau has a Ted Brewer Comfort Ratio of 26.01. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the First 405 Beneteau safe for offshore sailing?

The First 405 Beneteau has a Capsize Screening Formula value of 1.93. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the First 405 Beneteau?

The theoretical hull speed of the First 405 Beneteau is 7.98 knots, calculated from its waterline length.

How much does a First 405 Beneteau weigh?

The First 405 Beneteau has a displacement of 18,500.00 lb and a length overall (LOA) of 40.67 ft.

Who designed the First 405 Beneteau?

The First 405 Beneteau was designed by Jean Berret, first built in 1986.