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Model profile · for Great Loop buyers
Grand Banks 36 Classic
The published record on this model and what owners report, with the
questions worth asking while a boat is still a listing. This page covers the model.
Every boat still needs its own homework.
A proven, keel-protected trawler well suited to the Loop; the big variables are engine choice, actual air draft, and the near-universal aging-fuel-tank question.
The Grand Banks 36 Classic is a semi-displacement, single- or twin-diesel trawler built from the mid-1960s to 2004, switching from wood to fiberglass construction in mid-1973. It is a classic Great Loop candidate: keel-protected running gear, shoal draft, and modest fuel burn at displacement speed. Because production spanned nearly 40 years with many engine options and heavy variation in maintenance, condition and specifics vary enormously by hull, so verify everything on the specific boat with a survey. The two recurring budget/planning items are original steel fuel tank corrosion and air-draft measurement.
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CLAIMstated by one source, not yet confirmed
QUESTIONopen, and settled by looking at the boat itself
CONTEXTbackground on how this model is built or used
Sources are linked where published.
Handling
CLAIM
Keel-protected running gear is a Loop asset
The prop and rudder sit protected behind a substantial keel, which helps in the shallow, debris-prone, occasionally-grounding waters of the Loop. This is characteristic of keel-protected single-screw trawlers generally.
src:
Trawler Forum
CLAIM
Semi-displacement hull, usually cruised at 7 to 9 knots
A Denison review describes a semi-displacement hull with a flattened aft section, so it can go faster than a pure displacement boat, but owners run it at displacement speed. Comfortable cruise is roughly 7 to 8.5 knots, and efficiency and range come from staying there. Plan Loop legs around a single-digit cruise speed.
src:
Denison Yacht Sales review; Trawler Forum
Access
CONTEXT
Engine room: single owners like the extra room, and twins are workable
Owners of single-engine GB36s say the lone engine leaves extra room to work, and other members recommend the single partly for easier access. One member who spent time in a friend's twin-engine GB36 found room for two people between the engines and no trouble reaching the outboard sides. Either way, check access yourself before you buy.
src:
Trawler Forum, 'Grand Banks 36 single or twin?'
Your move: On the sea trial, get into the engine room and check you can reach the outboard side of each engine and the raw-water pumps.
Air draft
CLAIM
Air draft is configuration-dependent and must be measured
Reported heights vary wildly between listings because they depend on mast, radar, and Bimini setup. Owners report doing canals with the mast down and Bimini up, clearing by inches. The flybridge/windscreen height is the governing structure, and it is close to that of larger GB models. Removable mast and canvas are the main things that can be lowered.
src:
Trawler Forum
Your move: Measure your own boat's height to the top of the fixed structure, with and without electronics and mast, and build a written card of clearances; identify exactly what lowers.
QUESTION
What is the fixed windscreen/flybridge height with the mast down on THIS hull?
A comparable GB owner's manual cites height to the flybridge windscreen around 13'-14' from the waterline with mast down and windshield in place, and lower with the windshield removed. The controlling structure is the fixed windscreen once mast and canvas are down, so that dimension governs the tightest fixed bridges.
src:
Trawler Forum (GB owner's manual cited in air-draft thread)
Your move: Confirm the exact height to the top of the fixed windscreen with the mast down, and whether the windshield frame can be removed, before committing to the tightest legs.
Fuel & range
CLAIM
Modest fuel burn at displacement speed
Owner figures: a single 135 Lehman about 1.5 gph at 7 to 7.5 knots with a clean bottom; a single John Deere just under 2 gph at about 1,700 rpm; twins about 3.5 gph total at 7.5 to 8 knots; a Cat 3208N around 2.5 gph at 7.5 knots. A Denison review gives about 3 gph at 8 knots for the single Lehman. A clean bottom materially affects these numbers.
src:
Denison Yacht Sales review; Trawler Forum / broker listings
QUESTION
What is the actual fuel capacity on this hull?
Listed capacity ranges widely across boats, from about 170 gallons to roughly 400-405 gallons. Because burn is low, the practical range constraint is tank size, not efficiency, so the real capacity on your boat drives leg planning.
src:
broker listings
Your move: Get the verified installed fuel capacity in gallons in writing and confirm it against the tanks physically aboard.
CLAIM
Twin Cummins 210s: about 3.75 gph at 8.5 knots, one owner reports
A 1991 Grand Banks 36 Classic owner with twin Cummins 5.9BT 210s, about 30,000 lb, reports about 3.75 gallons per hour at roughly 8.5 knots and 1,600 rpm. The owner tracks gallons per hour rather than distance per gallon, because current and wind swing the distance.
src:
Trawler Forum, 'Fuel use, NMPG, Personal experience from Members' thread (Oct 2026)
Systems
QUESTION
Have the original steel fuel tanks been inspected or replaced?
The most-documented major issue on older GB 36s: original mild-steel tanks corrode from the bottom, often from water intrusion via deck fills, condensation, or drips from exhaust hoses/elbows, and older tanks predate 2-part epoxy coatings. Tops can look fine while the bottoms are heavily rusted, and the tanks are hard to inspect in place. This is a significant budget item, not a minor repair.
src:
Trawler Forum / Oxford Yacht Agency
Your move: Ask whether the tanks are original steel or replaced; if replaced, get the date, material, and invoice; if original, budget for inspection/replacement and have the surveyor examine the tank bottoms.
CONTEXT
Tank replacement cost and method reference
When tanks are replaced, a common approach is cutting out the old steel tanks and fitting several smaller aluminum tanks with manifolds and sight gauges. One 1978 GB 36 owner reported about $19K for this; another saw an initial $30,000 quote roughly double once yard fees and discovered issues were added. Treat these as rough planning figures, not quotes.
src:
Trawler Forum
Reading the boat
QUESTION
Wood or fiberglass hull, and what does the build year imply?
The 36 switched from wood to fiberglass in mid-1973. A wood hull demands a different survey approach (fastenings, planking, rot) than a glass boat, and confuses some listings. Confirm which you are looking at.
src:
Denison Yacht Sales; Trawler Forum
Your move: Confirm hull material and exact build year, and engage a surveyor experienced with that construction type.
Engines
The engines research is part of the full profile inside the
product. It covers factory options, tested performance and the engine-specific
questions in our members' dossiers, and it travels with every dossier and survey brief
built on this model.
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