Lagoon 400

The design was built by Lagoon catamaran in France, 2009 to 2012 with 264 boats completed and then in its improved S2 version from 2012 to 2017, but it is now out of production.{{cite web|url= https://sailboatdata.com/builder/lagoon-catamaran|title= Lagoon Catamaran|access-date = 20 March 2023|last= McArthur| first = Bruce |work = sailboatdata.com|year = 2023|archive-url= https://archive.today/20221218201237/https://sailboatdata.com/builder/lagoon-catamaran|archive-date= 18 December 2022|url-status= live}}{{cite web|url= https://sailboat.guide/lagoon|title= Lagoon Catamaran|access-date= 20 March 2023|author= Sea Time Tech, LLC|work= sailboat.guide|year= 2023|archive-url= https://archive.today/20221218201350/https://sailboat.guide/lagoon|archive-date= 18 December 2022|url-status= live}}{{cite web|url = https://www.boat-specs.com/sailing/builders/lagoon|title = Lagoon Sailboat builder|access-date = 20 March 2023|work = Boat-Specs.com|year= 2023|archive-url= https://archive.today/20230119203247/https://www.boat-specs.com/sailing/builders/lagoon|archive-date= 19 January 2023|url-status= live}}

The Lagoon 400 is a recreational catamaran, built predominantly of polyester fiberglass, with wood trim. It has a fractional sloop rig, with a deck-stepped mast, two sets of swept diamond spreaders and aluminum spars with 1X19 stainless steel wire rigging. A bowsprit and square-headed mainsail were optional. The hulls have nearly plumb stems, reverse transoms with swimming platforms, dual internally mounted spade-type rudders controlled by a wheel and twin fixed fin keels. The original production version displaces {{convert|22531|lb|kg|0|abbr=on}} and the S2 version displaces {{convert|22818|lb|kg|0|abbr=on}}.{{cite web|url= https://www.cruisingworld.com/sailboats/lagoon-400-home-thats-home-afloat/|title= Lagoon 400|access-date= 20 March 2023|last= Callahan|first= Steve |work= Cruising World|date= 6 April 2010|archive-url= https://archive.today/20230320163220/https://www.cruisingworld.com/sailboats/lagoon-400-home-thats-home-afloat/|archive-date= 20 March 2023|url-status= live}}

The improved S2 model introduced improved galley cupboard storage, a new electrical panel and changes to the cabin layouts, as well as other minor interior cosmetic changes.

The boat has a draft of {{convert|3.97|ft|m|abbr=on}} with the standard twin keels.

The boat is fitted with twin Yanmar diesel engines of {{convert|29|or|40|hp|kW|0|abbr=on}} each, for docking and maneuvering. The fuel tank holds {{convert|106|u.s.gal}} and the fresh water tank has a capacity of {{convert|79|u.s.gal}}.

The design has sleeping accommodation for four to eight people with up to four cabins, with double berth cabins fitted fore and aft in each hull. The main salon has an L-shaped settee plus there is a U-shaped settee in the cockpit. The galley is located in the salon on the starboard side. The galley is L-shaped and is equipped with a three-burner stove, an ice box and a double sink. A navigation station is opposite the galley, on the port side. Two to four heads can be fitted in the hulls. Cabin maximum headroom is {{convert|84|in|cm|0|abbr=on}}.

For sailing downwind the design may be equipped with a gennaker of {{convert|818|sqft|m2|abbr=on}} or a code 0 sail.

The design has a hull speed of {{convert|8.21|kn|km/h|abbr=on}}.

In a review, katamarans.com reported, "the 400 is one of Lagoon's 3rd generation designs that evolved from their classic 410. Although Lagoon veered to more comfort over performance in this generation, the 400 is still a competent sailor in a breeze, but she's no lightweight and struggles in lighter airs (under 10 knots) unless you have the bowsprit to fly the larger sails (gennaker, code 0 for example)."

In a 2010 Cruising World review, Steve Callahan wrote, "under sail, the 400 also tacks well. The small jib is a cinch to handle, and with the roll-up screecher, one gains a simple and minimal sail plan that's very easy to power up or down. That said, 75 inches of freeboard to the deck plus a high superstructure and low-aspect keels mean this is a boat that shouldn't be pinched up; it performs best when sailed fully powered and backed off a few degrees from a closehauled heading."

In a review for Cruising Sea, Daniella Wender wrote, "it's not much of a vacation if the boat is too cramped or passengers are falling over each other, but at the same time, the 400 invites social activity and conversation, almost creating the illusion that the entire vessel is a floating family rec room."{{cite web|url= https://cruisingsea.com/lagoon-400-catamaran-review-focus-on-what-really-matters/|title= Lagoon 400 Catamaran Review – Focus on What Really Matters!|access-date= 20 March 2023|last= Wender|first= Daniella|work= Cruising Sea|date= 13 July 2015|archive-url= https://archive.today/20230320163337/https://cruisingsea.com/lagoon-400-catamaran-review-focus-on-what-really-matters/|archive-date= 20 March 2023|url-status= live}}

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