Trawlers vs Motorsailers vs Sailboats: Can You Really Cross an Ocean?

Most people frame this as a safety question — is a trawler strong enough for the North Atlantic? The wrong question. Plenty of trawlers are built heavily enough to handle weather that would frighten their owners. The binding constraint is arithmetic. A passage from the Canaries to the Caribbean is roughly 2,700 nautical miles. A 40 ft trawler making 6 knots and burning around 2 gallons an hour needs about 900 gallons of diesel to cover it with no reserve at all, and no competent skipper crosses without a 20-30% reserve for weather routing and headwinds.

Boats designed for that mission exist — the Nordhavn 40 and its peers carry the tankage and the redundancy deliberately. The far more common coastal trawler with 300-500 gallons simply cannot, and the workarounds owners use (deck bladders, jerry cans lashed on deck) add weight high up and introduce a fuel-contamination risk exactly when you least want one. A sailboat has no equivalent problem. It carries fuel for harbour manoeuvring, calms and charging, and the ocean provides the rest.

Published fuel-consumption figures are close to useless because they come from flat water, clean bottoms and optimistic sea trials. Cruisers' own logs are better. One owner of a 52,000 lb, 56 ft displacement sailing hull reports 6 knots on 1.1 US gallons per hour — about 6 miles per gallon — and 7.8 knots on 2.4 gallons per hour, roughly 3.25 mpg. The same pattern shows up on smaller boats: a 41 ft sailboat logged over years averaged about 8 mpg under power.

By contrast, a 40 ft trawler at 6 knots is usually reckoned at around 3 mpg. Over 12,000 motored miles that difference works out to roughly $8,300 of diesel on the sailboat against about $22,200 on the trawler — the owner who published those figures calculated the gap at about $1,700 a year, or 3% of a cruising budget. Treat these as illustrative ranges from real logs, not laboratory constants: hull form, prop, bottom condition and sea state move them substantially.

Two things surprise people in that data. First, a heavy sailing hull under power is genuinely fuel-efficient — a fine-ended displacement hull pushes easily at 6 knots. Second, the trawler's fuel penalty, while large in absolute dollars, is a smaller slice of the total cruising budget than most sailors assume. Dockage, insurance, haul-outs and maintenance dominate both columns, a point our ownership cost breakdown goes into.

A sailboat under sail is the most comfortable of the three on passage, and this is not romanticism. Sail pressure damps roll. A boat heeled 15 degrees on a steady reach has a predictable, sustained motion that people adapt to within a day or two. The same boat motoring in a leftover swell with no sail up rolls sharply and unpredictably, which is exactly why sailors set a reefed main even when they are motoring — the steadying effect is worth more than the extra half-knot.

A trawler has no sail to damp it, which is why serious passagemaking trawlers carry paravane stabilisers ("flopper-stoppers") or active fin stabilisers. Both work. Both add cost, complexity and drag, and fins need a working hydraulic system. Without stabilisation, a beam sea on a round-bilged trawler produces a roll period that exhausts a crew inside 24 hours.

The motorsailer's pitch is exactly this: enough rig to steady the boat, enough engine to keep a schedule. In practice it delivers when the rig is real and the displacement is high. A motorsailer whose "sail plan" is a small main and a roller headsail that cannot drive the hull in under 15 knots of wind gives you a trawler with two extra maintenance items bolted on.

Purchase price is the least interesting number. A sailboat carries the standing and running rigging bill — figure a full standing rigging replacement every 10-15 years, in the $6,000-$15,000 range on a 40-footer, plus sails that wear out on a similar cycle. A trawler avoids those entirely but usually has more engine: twin diesels mean twice the oil changes, twice the impellers, twice the injector service, and a much larger repowering bill when the time comes, which our repowering guide sizes up.

Trawlers also tend to carry more systems as standard — a generator, air conditioning, sometimes a watermaker and washer-dryer — because the electrical budget allows it. Each is a genuine comfort and each is an annual service line. Motorsailers get the worst of both columns on paper: rig maintenance plus a larger engine. What saves them is that the rig is usually simple and heavily built, and the engine, while bigger, is normally a single unit rather than a pair.

Insurance is the quiet differentiator. Underwriters price ocean passages on crew experience and boat condition more than hull type, but they will ask hard questions about fuel range on a motor vessel and about rig age on a sailboat. Our insurance guide covers what they actually look for.

On a sailboat, a total engine failure 1,500 miles from land is an inconvenience. You sail on, you arrive later, and you probably enter the destination harbour under tow or under sail. On a single-engine trawler, the same failure is an emergency requiring rescue or salvage. This is why serious passagemaking motor vessels carry either twin engines or a get-home system — a wing engine or a hydraulic drive off the generator. That redundancy costs real money and real space.

It also cuts the other way. A dismasting on a sailboat mid-ocean is a genuine crisis, and boats have been lost to it. The difference is frequency: rigs fail far less often than fuel systems, and a well-maintained rig inspected annually is among the more predictable systems on a boat. Both types reward the same discipline — replace things on a schedule rather than on failure.

Choose a sailboat if the crossing itself is part of the appeal, if the budget is limited, or if you want the option to keep going indefinitely without a fuel budget dictating the route. This covers the large majority of people who ask the question.

Choose a trawler if you are coastal cruising the Great Loop, the Inside Passage or the Intracoastal Waterway, where a rig is a liability under bridges and motoring is the plan anyway — and accept that an ocean crossing means either a purpose-built long-range hull or shipping the boat.

Choose a motorsailer if you sail shorthanded or with a crew whose tolerance for heel is limited, and you want a boat that will make a schedule in light airs without guilt. Buy one with genuine displacement and a real rig, and read the sail plan sceptically before you believe the brochure.

The quick comparison below is for a nominal 40 ft boat of each type in cruising trim. Treat the fuel figures as illustrative ranges from cruisers' logs rather than guaranteed numbers.

How to decide. Work backwards from the longest passage you genuinely intend to make, not the one you daydream about. Multiply its distance by 1.3 for reserve, divide by your candidate boat's real-world mpg, and compare the result with its actual tankage. If the answer does not fit, you are either buying a different boat or buying sails. Then price the annual bill — dockage, insurance, haul-out, engine service, rig or stabiliser maintenance — because that recurring figure, far more than the purchase price, determines whether the boat stays in your life.