August 19, 2026
Lagoon Seventy 8 Review: A 78-Foot Power Catamaran With a 4'2" Draft
The Lagoon Seventy 8 is a 78'1" power catamaran with a 4'2" draft, twin Volvo D11-510 diesels and three to six cabins plus crew quarters. Sh…
Read the articleLagoon Seventy 8
Expert Review, Technical Specifications & Market Analysis
The Essentials
| Feature | Specifications |
|---|---|
| Overall Length | 78'1" (23.80 m) |
| Beam | 36'1" (11.00 m) |
| Draft | 4'2" (1.27 m) |
| Displacement | 137,127 lbs (62,200 kg) |
| Engines | Twin Volvo D11-510 (2 x 510 HP) |
| Fuel Capacity | 2,246 gal (8,500 L) |
| Water Capacity | 423 gal (1,600 L) |
| Cabins / Heads | 3-6 Cabins / 3-6 Heads + Crew |
| Max Speed | 19 knots |
| Cruise Speed | 10 knots |
Source: Spec & Photos courtesy of Lagoon. Specs verified by Tony Smith, USCG 100 Ton Master, on August 18, 2026.
Most 78-foot yachts decide your anchorage for you. The Lagoon Seventy 8 draws 4'2", which puts the shallow spot with the good beach back on the table - with three to six cabins, a full flybridge and crew quarters behind you.
Part of the Lagoon Power Catamarans series — see how owners step up through the lineup.
Quick Verdict
- 4'2" draft on a 78-foot yacht - the defining specification, and it puts shallow anchorages within reach of a yacht that would normally be stuck offshore
- Twin Volvo D11-510 diesels give a 19-knot maximum and a 10-knot cruise, with a 580 HP engine option offered - useful pace for repositioning, comfortable at cruise
- Owner's suite with a transom integrated into the coaming for a private, uninterrupted sea view that no other cabin on board has, plus a flybridge that works as a full living deck with standard, sun bath, loose furniture or jacuzzi specifications
- CE Category A offshore certification for 14 people, plus 2,246 gal of fuel capacity for the longer passages Lagoon designed her around
- Award-winning design: multihull-of-the-year honours in the motor-multihull and power-catamaran categories across 2017 and 2018
- The trade-offs are berth and handling: 36'1" of beam needs an end tie or T-head, and 62 tonnes is not a single-handed docking job
Our Take
When clients tell me they want a big catamaran but they also want the Bahamas, the Seventy 8 is usually the first boat I put in front of them. Seventy-eight feet drawing four feet two inches is not a small advantage - it is a completely different kind of trip. You are not looking at the beach through binoculars while the tender does laps. You are anchored where you want to be. In fifteen years of doing this, I have not found many specifications that change a client's cruising life as directly as that one.
The other thing I would push you toward is the owner's suite. Lagoon integrated the transom into the coaming so the suite gets its own private view of the water, and it is the detail people remember three weeks after the walkthrough. Combined with the flybridge - where the helm sits next to the lounge instead of dominating it - you get a boat where the owner has somewhere to go and the guests have somewhere to be, which is the thing that determines whether a two-week charter with friends stays fun.
A word on the Heritage designation, because buyers ask. Lagoon has moved the large power catamaran flagship role to the Eighty 3, and the Seventy 8 sits in the Heritage line now. I do not read that as a knock. She won multihull-of-the-year honours in Asia and Europe, she has been in service long enough that the design is thoroughly proven, and she is available now rather than on a build slot. What I insist on is inspecting the individual boat: which engines, which galley position, how many cabins, and what is on the flybridge. Get those right and this is one of the most capable cruising platforms at her length, full stop.
Official Lagoon Premiere: Inside the Lagoon Seventy 8
Video courtesy of Lagoon.
Lagoon Seventy 8 Photo Gallery
Photos courtesy of Lagoon.
Lagoon Seventy 8 Overview
The Lagoon Seventy 8 is a flybridge power catamaran of 78'1" (23.80 m) overall on a 36'1" (11.00 m) beam, drawing 4'2" (1.27 m) and displacing 137,127 lbs (62,200 kg) unladen. Accommodation runs to 3-6 Cabins / 3-6 Heads + Crew across eight to sixteen berths, with CE Category A offshore certification for 14 people. She carries 2,246 gal (8,500 L) of fuel and 423 gal (1,600 L) of water.
Lagoon's own framing is that space and privacy naturally go together aboard this yacht, and that she has the autonomy to make longer passages with peace of mind - which is a fair description of what she is built around. This is a boat for weeks aboard with a group, configurable either for owner-operation with occasional crew or for a full-time captain and chef, with dedicated crew accommodation for the second case. She now sits in Lagoon's Heritage line: a settled, award-winning design available on the water today rather than through a build slot.
Performance & Handling
Propulsion is Twin Volvo D11-510 (2 x 510 HP), giving a maximum of 19 knots and a cruise of 10 knots. Lagoon also lists a 2 x 580 HP engine option, so confirm which is fitted in the specific hull you are looking at. The 19-knot top end is genuinely useful - enough to reposition ahead of weather or shorten a delivery leg - but the boat is designed to live at 10 knots, where the wide beam and twin hulls give a flat, unfussy ride that does not wear people out over a long day.
The flybridge carries the helm adjoining the lounging space, so whoever is driving stays part of the day rather than sealed off from it, and twin screws set 36'1" (11.00 m) apart give strong low-speed control - though 137,127 lbs (62,200 kg) is predictable rather than nimble, and not a solo docking job on a windy afternoon. Fuel capacity is 2,246 gal (8,500 L), which is what Lagoon means by the autonomy she was designed around; how far that carries depends on speed, loading and conditions, so use the sea trial on the boat in front of you. Published air draft is 29'4" (8.95 m) - the number to check against fixed bridges on any inside route.
Interior & Accommodations
The owner's suite is the design's signature move: Lagoon integrated the transom into the coaming so the suite opens onto a private, uninterrupted view of the sea, a piece of the boat nobody else on board has access to. Around it, three galley positions are offered - aft, up and forward - across cabin counts from three to six. The 3-6 Cabins / 3-6 Heads + Crew range is worth thinking through carefully, because the lower counts convert hull volume into stowage and larger cabins rather than more berths.
The saloon runs contemporary furnishings and refined woodwork against panoramic glazing, so the view stays continuous from inside right down to the water. The flybridge is where the boat actually lives, treated as a full additional living deck rather than a driving station with seats: specify it standard, with sun baths, with loose furniture for a deck you rearrange to suit the evening, or with a jacuzzi. A sundeck can be added on the cockpit as well.
Market Position
Inside Lagoon's range the Seventy 8 is the large power catamaran, sitting above the 66'1" Sixty 7 and directly alongside the Eighty 3 that now leads the power line - which makes her the fully proven option at 78 feet for a buyer who would rather step aboard a known quantity than wait on a build slot. Cross-brand she is compared with the Sunreef 80 Power, the Silent 80 and the Aquila 70 Luxury, and what separates her inside that group is the 4'2" (1.27 m) draft: a 78'1" yacht with three to six cabins plus crew quarters that can still anchor where a far smaller boat would have to. The counterweight is scale - 36'1" (11.00 m) of beam and 137,127 lbs (62,200 kg) set both the berth requirement and the handling discipline.
Who the Seventy 8 Is For
Buy the Seventy 8 if you host regularly, cruise in weeks rather than weekends, and want shallow anchorages genuinely available to you at 78 feet - with the flexibility to run her yourself with occasional crew or hand her to a captain and chef full time. Be realistic about the two constraints: 36'1" (11.00 m) of beam needs an end tie, a T-head or a megayacht berth, so confirm your home port before anything else, and a 10-knot cruise means passages are planned in days rather than hours. If you want a smaller and more genuinely owner-operable version of the same shoal-draft idea, the Sixty 7 is the boat below her; and if you would rather sail than motor at this length, that is the Seventy 7.
Lagoon Seventy 8 Articles & Guides
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Frequently Asked Questions
How many cabins can the Lagoon Seventy 8 be configured with?
She is built in 3-6 Cabins / 3-6 Heads + Crew, sleeping eight to sixteen, with crew accommodation on top of that count. Three galley positions are offered — aft, up and forward — and that choice changes the character of the boat more than the cabin count does.
Take the low end of the range seriously. At three or four cabins, hull volume becomes stowage and larger cabins rather than more berths, which is the right answer for an owner's family and the wrong one for a charter programme. An aft galley suits a crewed or charter boat by keeping service traffic out of the social space; galley up puts the cook in the middle of it. The owner's suite is the design's signature move — the transom is integrated into the coaming so the suite opens onto its own uninterrupted view of the sea, a piece of the boat nobody else aboard has access to. The flybridge can be specified standard, with sun baths, with loose furniture, or with a jacuzzi.
Lagoon Seventy 8 or the newer Eighty 3 — what is the difference?
The Seventy 8 is the settled, award-winning flagship you can step aboard now; the Eighty 3 is the new boat you commission and personalise. They are close in size — 78'1" (23.80 m) against 80'1" (24.40 m) — and share a 36'1" (11.00 m) beam and a 4'2" (1.27 m) draft, so both open the same shallow anchorages.
The real differences are power, accommodation and process. The Seventy 8 runs Twin Volvo D11-510 (2 x 510 HP) for a maximum of 19 knots and a cruise of 10 knots; the Eighty 3 runs Twin John Deere N13-580 (2 x 580 HP) for a maximum of 18 knots and a cruise of 12 knots — so the newer boat is the faster cruiser, not the faster sprinter. Accommodation is 3-6 Cabins / 3-6 Heads + Crew against 4-6 Cabins / 4-6 Heads + Crew, and the Eighty 3 is the heavier boat at 151,017 lbs (68,500 kg) unladen against 137,127 lbs (62,200 kg). Buy the Eighty 3 if specifying the yacht is part of the pleasure; buy the Seventy 8 if you would rather be cruising this season.
How fast is the Lagoon Seventy 8, and what does she actually cruise at?
Lagoon publishes a maximum of 19 knots and a cruise of 10 knots from Twin Volvo D11-510 (2 x 510 HP). The 19-knot top end earns its keep repositioning ahead of weather or shortening a delivery leg, but the boat is designed to live at 10 knots, where the 36'1" (11.00 m) beam gives a flat, unfussy ride over a long day.
Lagoon also lists a 2 x 580 HP engine option, so confirm which is fitted in the hull in front of you — it changes both the sea trial and the service parts. Fuel capacity is 2,246 gal (8,500 L), which is what the yard means when it describes the autonomy to make longer passages with peace of mind; how far that carries you depends entirely on speed, loading and sea state, so take real consumption figures off the sea trial rather than a brochure. Published air draft is 29'4" (8.95 m) — the number to check against fixed bridges on any inside route.