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Mon – Fri: 8 am to 9 pm & Sat – Sun: 10 am to 8 pm
The Boston Whaler 405 Conquest is the flagship Conquest with yacht-scale accommodation and offshore fishing capability.
At 41′ 4″ overall, within Boston Whaler’s Conquest family, the strongest reason to choose this size is how it balances physical footprint with the family’s mission. Its beam, fuel capacity and 30,000-pound-class wet weight demand yacht-like ownership planning
The 405 Conquest should be cross-shopped with 325 Conquest, 380 Realm or 420 Outrage. Within the Conquest family, that comparison helps separate a genuine use-case advantage from the temptation to choose a larger or more expensive Whaler simply because it is available.
For a 405 Conquest shopper, Boston Whaler’s foam-filled fiberglass construction is a major brand attribute, but a used boat still deserves a normal structural inspection. Within the Conquest family, unsinkable construction does not make impact damage, poor repairs or neglected systems irrelevant.
At 41′ 4″ overall, the Conquest mission is offshore fishing, all-weather cruising and overnight accommodation. A 405 Conquest buyer whose normal weekend does not resemble that mission may be better served by another Whaler family.
At the dock, sit the expected crew in the 405 Conquest. The 405 Conquest capacity plate tells how many people are allowed; the real question is whether those people can move, store gear and use the boat comfortably.
The main compromise is clear: its beam, fuel capacity and 30,000-pound-class wet weight demand yacht-like ownership planning
Published factory figures. Confirm every dimension against the individual boat before you commit.
At 41′ 4″ overall, the foam-filled deep-V hull carries cabin and hardtop weight, so running-surface condition and structural repair quality matter alongside cabin condition.
On the 405 Conquest, 19 degrees of deadrise and 30″ of draft help explain where the hull sits between shallow-water access and offshore comfort. For a 405 Conquest shopper, those dimensions should be interpreted with load and sea state in mind.
Beam is 13′ 6″. At 41′ 4″ overall, that affects passenger space, dock fit and road transport. Within the Conquest family, boats wider than 8 feet 6 inches can require permit or professional-hauling considerations depending on jurisdiction.
Dry hull weight is 22,400 lbs. On the 405 Conquest, lift and trailer decisions should add propulsion, fuel, batteries, freshwater, gear and installed options instead of sizing equipment from dry weight alone.
Inspect the 405 Conquest from stem to transom in bright light. When evaluating the 405 Conquest, look along chines, strakes, keel and transom corners for repair evidence, gelcoat mismatch or impact.
Within the Conquest family, foam-filled construction makes professional repair quality especially important. Within the Conquest family, a documented repair can be acceptable, while an unexplained patch or distorted running surface deserves more investigation.
When evaluating the 405 Conquest, check engine mounting points, trim hardware, transducers and through-hulls. For a 405 Conquest shopper, high-output outboards place real load on the transom and poorly sealed accessory penetrations can create avoidable problems.
For a 405 Conquest shopper, rails, cleats and rub rail can reveal docking history. For a 405 Conquest shopper, heavy cosmetic damage around one corner often points to repeated contact rather than one harmless scratch.
When evaluating the 405 Conquest, use the capacity plate and correct model-year factory specification to resolve conflicts with seller copy. At 41′ 4″ overall, online listings frequently inherit numbers from another year.
The 405 Conquest propulsion package is central to ownership. On the 405 Conquest, engine count determines service cost, redundancy, steering complexity, battery requirements and much of the boat’s fuel budget.
Published maximum horsepower is 1,800 HP. On the 405 Conquest, that ceiling should not automatically become the target on a smaller Whaler if a more moderate package carries the normal crew comfortably.
Sea-trial the 405 Conquest with realistic load in mind. Within the Conquest family, adults, full fuel, fishing equipment and overnight gear can expose weak acceleration or poor propeller selection that an empty dealer run hides.
Within the Conquest family, on multi-engine versions, record every serial number and hour count. For a 405 Conquest shopper, engines with different histories are not automatically a problem, but the difference should be understood and documented.
Test Mercury digital throttle, steering, joystick or SmartCraft functions fitted to the 405 Conquest. Within the Conquest family, a clean engine start is not enough if networked controls or engine data are intermittent.
When evaluating the 405 Conquest, inspect propellers, skegs, gearcases, trim cylinders, steering hardware and mounts. At 41′ 4″ overall, underwater damage can create vibration and lost performance without leaving obvious cosmetic evidence above deck.
Ask for scheduled service records. At 41′ 4″ overall, gear oil, impellers, plugs, fluids, anodes and corrosion protection tell more about long-term care than a freshly detailed cowling.
For a 405 Conquest shopper, during the sea trial, include idle maneuvering, acceleration, normal cruise and a broad loaded turn. At 41′ 4″ overall, engine rpm and steering feel should remain consistent.
For a 405 Conquest shopper, if future repower is part of the ownership plan, verify maximum engine weight and transom rating before assuming the newest outboard is a direct replacement.
The 405 Conquest carries a published fuel reference of 620 gallons. When evaluating the 405 Conquest, verify the exact year because redesigned models can change tank volume while keeping the familiar name.
405 Conquest fuel burn changes with engine package, sea state, trim, bottom condition and passenger load. Within the Conquest family, a published performance test should be treated as one controlled configuration rather than a guarantee.
For the 405 Conquest, identify a comfortable cruise and watch actual fuel flow on the engine display. At 41′ 4″ overall, build range around that speed and retain a meaningful reserve.
At 41′ 4″ overall, full fuel adds significant weight, especially on Conquest, Realm, Outrage and large Vantage boats. On the 405 Conquest, that can move acceleration and the most efficient cruise rpm.
Inspect fuel fills, vents, hoses, separators and accessible tank areas on a used 405 Conquest. At 41′ 4″ overall, persistent odor should be investigated before closing.
For a 405 Conquest shopper, a boat that has been stored for months may also need old fuel addressed. When evaluating the 405 Conquest, ask how the seller handled stabilization and ethanol exposure.
On the 405 Conquest, annual fuel budget matters more than one test day. If the family cannot comfortably afford to run the 405 Conquest as intended, the purchase will not deliver its promised use.
The 405 Conquest should be judged at the speeds the owner expects to use most often. Within the Conquest family, top speed is less important than clean planing, predictable steering, visibility and a comfortable cruise.
For a 405 Conquest shopper, the foam-filled deep-V hull carries cabin and hardtop weight, so running-surface condition and structural repair quality matter alongside cabin condition.
Practice an actual dock approach. Within the Conquest family, windage, beam and engine count can make two Whalers of similar length behave very differently at idle.
At 41′ 4″ overall, at cruise, cross ordinary wakes and note pounding, spray, steering correction and windshield protection. The 405 Conquest hull should inspire confidence without requiring constant correction.
When evaluating the 405 Conquest, test acceleration with normal passenger weight in mind. Within the Conquest family, coolers, rods, full fuel and cabin gear can expose an underpowered or poorly propped setup.
Use several trim settings. The 405 Conquest should respond predictably without persistent porpoising, excessive bow rise or heavy steering.
When evaluating the 405 Conquest, operate trim tabs or automated trim systems where fitted. On the 405 Conquest, intermittent control should be repaired before delivery.
On the 405 Conquest, listen for hardtop rattles, loose panels or propeller resonance. On the 405 Conquest, noise can reveal installation problems that a speed number never shows.
The 405 Conquest is a cabin cruiser designed around hardtop, cabin, head, galley and fishing cockpit. For a 405 Conquest shopper, the deck should make that mission obvious before the buyer starts counting options.
Within the Conquest family, walk the deck with the normal crew aboard. Within the Conquest family, seat people forward and aft, then open the storage, fishboxes, livewells or cabin access they would use during a normal day.
Fishing equipment should be operated. When evaluating the 405 Conquest, run livewell pumps, lift fishbox lids, inspect rod holders and verify drains rather than assuming clean equipment is functional.
On the 405 Conquest, family seating deserves the same attention. Within the Conquest family, convertible backrests, removable cushions and tables should move easily enough that the family will actually use them.
The 405 Conquest helm needs clear sightlines with passengers seated forward. Within the Conquest family, windshields and hardtops should add weather protection without creating awkward blind spots.
At 41′ 4″ overall, swim access is part of nearly every Whaler mission. When evaluating the 405 Conquest, test ladders, transom doors, dive doors and engine clearance with the real propulsion package.
Within the Conquest family, storage should be dry and reachable. For a 405 Conquest shopper, a large total storage volume is less useful if every locker is trapped beneath occupied seating.
For a 405 Conquest shopper, on Conquest and Realm, walk the transition below deck with the cockpit occupied. Within the Conquest family, cabin access is more convincing when it does not interrupt everyone else.
If the 405 Conquest layout feels awkward during a dockside test, compare 325 Conquest, 380 Realm or 420 Outrage instead of assuming ownership will make the compromise disappear.
90-gallon freshwater system – On the 405 Conquest, 90-gallon freshwater system should be checked for condition and operation because it is part of the reason this configuration carries value over a simpler sistership.
On the 405 Conquest, full cabin with mid-berth should be checked for condition and operation because it is part of the reason this configuration carries value over a simpler sistership.
On the 405 Conquest, enclosed head and separate shower should be checked for condition and operation because it is part of the reason this configuration carries value over a simpler sistership.
On the 405 Conquest, full galley should be checked for condition and operation because it is part of the reason this configuration carries value over a simpler sistership.
On the 405 Conquest, available upper station should be checked for condition and operation because it is part of the reason this configuration carries value over a simpler sistership.
On the 405 Conquest, simrad helm integration should be checked for condition and operation because it is part of the reason this configuration carries value over a simpler sistership.
On the 405 Conquest, fathom e-power capability should be checked for condition and operation because it is part of the reason this configuration carries value over a simpler sistership.
On the 405 Conquest, cockpit fishing and entertaining systems should be checked for condition and operation because it is part of the reason this configuration carries value over a simpler sistership.
The 405 Conquest systems profile centers on shore power, cabin climate, freshwater and waste systems. For a 405 Conquest shopper, the inspection should reflect that mission rather than using one checklist for every Whaler.
Start with batteries and charging. Within the Conquest family, engine banks, house banks and large audio or cabin loads should be identified and load-tested where practical.
When evaluating the 405 Conquest, test installed Simrad, SmartCraft, VesselView or other electronics. When evaluating the 405 Conquest, confirm GPS, sonar, engine data and network communication rather than simply verifying the screen powers on.
When evaluating the 405 Conquest, run freshwater and raw-water systems for several minutes. Within the Conquest family, pumps should build pressure and fittings should remain dry.
Within the Conquest family, on boats with heads, test freshwater, waste pumps, tank gauges and ventilation. For a 405 Conquest shopper, odor or slow pumps can signal deferred maintenance.
The 405 Conquest belongs to marina-first ownership with overnight systems. Its 41′ 4″ length, 13′ 6″ beam and 22,400 lbs dry hull weight should shape the storage plan before delivery.
Add engines, 620 gallons of fuel capacity, batteries, freshwater where equipped, gear and trailer weight before choosing a tow vehicle or lift.
On the 405 Conquest, at a marina, verify slip width, shore power where relevant, finger-pier access and local Mercury service. Within the Conquest family, large cabin boats need additional attention to freshwater and waste services.
Supply is lower-volume and option-heavy, so engine package, upper station, pilothouse and onboard power equipment move value dramatically.
For a 405 Conquest shopper, propulsion is the first major adjustment. For a 405 Conquest shopper, engine count, horsepower, hours and service history can change value more than cosmetic color.
Electronics are next. At 41′ 4″ overall, newer integrated Simrad or Mercury systems can reduce refit cost, but older displays should not be valued at their original retail price.
For a 405 Conquest shopper, fishing options, tops, outriggers, trolling-motor systems and livewells matter most when the buyer will use them. Within the Conquest family, expensive equipment that does not fit the mission is not automatically valuable.
For a 405 Conquest shopper, cabin condition deserves a separate adjustment on Conquest and Realm. At 41′ 4″ overall, air conditioning, refrigeration, heads, shore power and freshwater systems can create meaningful deferred maintenance.
On the 405 Conquest, trailer condition matters heavily on Super Sport, Montauk and smaller Dauntless models because the trailer is part of the normal ownership workflow.
On the 405 Conquest, cosmetic condition should be separated from mechanical condition. For a 405 Conquest shopper, clean cushions cannot compensate for neglected engines or damaged running surfaces.
A documented 405 Conquest can justify a premium over a cheaper sistership with uncertain history. For a 405 Conquest shopper, strong total value matters more than the lowest advertised price.
Illustration only and not an offer of credit.
When evaluating the 405 Conquest, run the payment on the real transaction and leave room for insurance, fuel, annual engine service, storage and the systems specific to this Conquest model.
Illustration only and not an offer of credit. Your actual rate and term depend on credit profile, vessel age, loan amount and ownership structure.
The first cross-shop is 325 Conquest, 380 Realm or 420 Outrage.
The 405 Conquest should win because the flagship Conquest with yacht-scale accommodation and offshore fishing capability fits the buyer better, not because one payment is lower.
When evaluating the 405 Conquest, compare true size, hull mission, propulsion, passenger layout and storage before financing.
If that compromise would make the 405 Conquest frustrating to own, the alternative deserves a closer look.
Start with hull identification and model year. For a 405 Conquest shopper, Boston Whaler changes engines, fuel systems, electronics and options over time, so the exact year matters even when the model name stays familiar.
When evaluating the 405 Conquest, verify seller specifications against the capacity plate and correct factory data. For this configuration, Boston Whaler publishes 41′ 4″ LOA, 13′ 6″ beam, 1,800 HP maximum horsepower and 620 gallons fuel capacity for the referenced configuration.
When evaluating the 405 Conquest, inspect the hull in natural light. For a 405 Conquest shopper, focus on chines, keel, transom corners and rub rail, then view the running surface from underneath.
When evaluating the 405 Conquest, review engine hours and service history. Within the Conquest family, on multiple-engine boats, evaluate each engine separately and ask about any replacement or unusual hour difference.
When evaluating the 405 Conquest, operate steering, trim and throttle under load. A short idle demonstration is not enough for a high-output 405 Conquest.
When evaluating the 405 Conquest, test pumps, livewells, fishbox drains, freshwater fittings and head systems fitted to the boat. For a 405 Conquest shopper, small failures are easier to negotiate before purchase.
When evaluating the 405 Conquest, inspect electronics and networked engine data. At 41′ 4″ overall, a bright display does not prove radar, sonar, GPS, autopilot or engine gateways are all healthy.
When evaluating the 405 Conquest, use every convertible seat, table, sunshade and hardtop feature. Within the Conquest family, an expensive option only adds value when it works and the family actually wants it.
For a 405 Conquest shopper, Boston Whaler currently lists the model in its active U.S. family.
Supply is lower-volume and option-heavy, so engine package, upper station, pilothouse and onboard power equipment move value dramatically.
At 41′ 4″ overall, if a trailer is included, inspect it as a separate asset. At 41′ 4″ overall, on marina boats, review lift history and bottom condition instead.
Finally, compare 325 Conquest, 380 Realm or 420 Outrage. The 405 Conquest should remain the better fit after the technical inspection and ownership budget are understood.
405 Conquest buyers should price insurance before delivery because value, horsepower, navigation area and storage location can change the premium more than the hull length suggests.
A clean 405 Conquest service file should include engine maintenance plus receipts for pumps, batteries, electronics and trailer or marina work. At 41′ 4″ overall, documentation is especially valuable when two similar boats are close in asking price.
Start your application with the actual 405 Conquest details with model year, seller type, propulsion, engine hours where available and asking price.
Within the Conquest family, year, propulsion, electronics, options, seller type and condition can move the transaction enough that complete boats should be compared instead of broad averages.
Boston Whaler publishes 41′ 4″ as the length reference used here. When evaluating the 405 Conquest, verify the exact model year and completed rig when choosing a slip, trailer or storage building.
Boston Whaler publishes a persons capacity of 20 for this model. The capacity plate on the actual 405 Conquest remains the final authority.
The published maximum is 1,800 HP. On the 405 Conquest, match the engine package to the exact model year and capacity plate before treating horsepower as a value upgrade.
The published fuel reference is 620 gallons. On the 405 Conquest, range should be estimated from the installed engine configuration, normal passenger load and a conservative reserve.
Trailering depends on the 13′ 6″ beam, 22,400 lbs dry hull weight and completed trailer package. On the 405 Conquest, wide models may need specialized transport, while smaller Montauk and Super Sport boats are designed around routine trailering.
When evaluating the 405 Conquest, inspect the hull, transom, engine or engines, steering, pumps, electronics, upholstery, hardtop, cabin, head, galley and fishing cockpit, and the trailer or lift history. Within the Conquest family, pay extra attention to equipment that defines this family.
Potentially. For a 405 Conquest shopper, model year, value, condition, purchase amount, seller type and borrower qualifications matter. On the 405 Conquest, start your application with the actual details so financing reflects the exact boat.
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