YachtCodex
Boston Whaler

405 Conquest

In production
Boston Whaler 405 Conquest — photo 1

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2021-405-2020-122-cc — Boston Whaler

Summary

41.3 ftLOA2.5 ftDRAFT13.5 ftBEAM
Motor MonohullOutboard
Length overall
41.3 ft
Beam
13.5 ft
Maximum speed
—
Cruising speed
—
Range
—

* A standard reference image, not the actual boat — shown to help visualise this model's published dimensions.

Best Suited For

Tags are derived from certified class, length, sail area, accommodation and tankage using the criteria described on the Sources page; an editor may add or remove one.

Speed, Power & Tanks

What the builder publishes about how fast, how strong and how much the boat carries.

Power to weight

Total engine power per tonne of published displacement — more means livelier acceleration for the hull. Drawn for motor yachts.

not published: engine power

Tanks

Fuel and water on one scale: a tank twice the height holds twice as much.

  • Fuel620 gal
    Water90 gal

Dimensions

LOA
41.3 ft (12.6 m)
Hull length
—
LWL
—
Beam
13.5 ft (4.11 m)
Draft (min)
2.5 ft (0.76 m)
Draft (max)
—
Air draft
—
Displacement
30,360 lb (13,771 kg)
Ballast
—
Cabins
—
Heads
—
Berths
—

Performance

Maximum speed
—
Cruising speed
—
Range
—
Guests
—
Crew
—

Engine and Tanks

Engine
—
Engine count
—
Engine manufacturer
—
Propulsion type
outboard
Fuel capacity
620 gal (2,347 L)
Fresh water capacity
90 gal (340.7 L)
Black water capacity
30 gal (113.6 L)

Construction

Hull material
—
Deck material
—
Rudder type
—
Steering wheels
—

Builder's Own Figures

Dry weight (no engine)
22,400 lbs. (10,160 kg)
Deadrise at transom
19°
Minimum horsepower (total)
1,200 HP (895 kW)
Persons capacity
20
Diesel tank (generator)
38 gallons (144 L)
Maximum horsepower (total)
1,800 HP (1,342 kW) (spec sheet) / 1,800 HP (model page)
Weight with engines, fuel and water as printed
spec sheet 30,360 lbs. (17,853 kg); model page 30,360 lbs -- the metric figure disagrees with both imperial printings, which are converted
Displacement basis
Weight (w/engines, fuel, and water) as printed
Draft basis
hull draft as printed (engines up)

Figures read frombostonwhaler.com/content/dam/bostonwhaler/technical/spec-sheets/my27/bw-2027-405-conquest-spec-sheet.pdf· Specificationsread 10/17/2026

About Boston Whaler

Premium production

American builder of foam-filled, 'unsinkable' outboard boats from Edgewater, Florida, part of Brunswick Corporation — twenty-one models from 6.5 m entered here, from the 210 Montauk to the 13-metre 420 Outrage, in the Montauk, Dauntless, Vantage, Conquest, Realm and Outrage series.

Boston Whaler says that since its founding more than sixty years ago it has set out to build the safest, easiest-to-own and most exciting boats on the water. Its founder, Richard Fisher, was so confident in his fail-safe boat that he tested it publicly, and LIFE magazine documented the whole thing; the company still says you can cut a Whaler in two and drive away in the half with the engine. That promise rests on its proprietary foam-filled Unibond hull construction, which gives the flotation and strength behind the 'Unsinkable Legend', and government agencies and military forces around the world rely on the boats. Whalers are built at the factory in Edgewater, Florida, where the company's designers, engineers and naval architects hold a long list of patents; improved facilities and technology have let it build more and larger boats, up to the flagship 420 Outrage. Boston Whaler is part of the Brunswick family.

Visit brand page

The Boston Whaler Range

Every model Boston Whaler publishes, by length — where this one sits in the range.

  1. 420 Outrage42.7 ft
  2. 405 Conquest· this model41.3 ft
  3. 380 Outrage38 ft
  4. 380 Realm38 ft
  5. 360 Outrage36.5 ft
  6. 365 Conquest36.3 ft
  7. 350 Realm35.5 ft
  8. 330 Vantage34.3 ft
  9. 330 Outrage33.8 ft

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