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Model profile · for Great Loop buyers
Ocean Alexander 450 Classicco Sedan
What the published record establishes about this model, what owners report,
and the questions worth asking while a boat is still a listing. This page is about the
MODEL — a specific hull always gets its own homework.
A capable semi-displacement flybridge cruiser well suited to the Loop, but the era's thick-gelcoat spider-cracking is the defining model-wide risk to scope carefully.
The Ocean Alexander 450 Classicco Sedan is a roughly 45-foot flybridge motoryacht of the late-1990s/early-2000s Taiwan-built Ocean Alexander line, closely related to the 426 and 456 models. Loop-relevant strengths are a comfortable displacement/semi-displacement cruise with generous fuel tankage and, on many boats, durable lower-rated Caterpillar diesels. The most consistently documented model-family concern is gelcoat spider-cracking on OA boats of this era, a potential five-figure cosmetic/refinish liability. Note: model naming from this period (426/450/456) is genuinely confused in listings, so confirming the exact model via HID matters before an offer.
How to read this: 🟢 Fact = confirmed against a document, spec sheet,
or owner. Everything else — Claim, Pattern, Question, Context — is not yet
verified: things to check, not settled truth. Sources are linked where published.
Identity
QUESTION
Is this actually a 450 Classicco Sedan, and not a 426 or 456?
Ocean Alexander's late-1990s/early-2000s naming (426, 450, 456) is closely related and frequently mislabeled by brokers and owners. Owners describe the 426-vs-450 difference as largely cockpit/salon length, with the 450 hull roughly 3' longer, some of that added to the salon. Getting the model right affects comparables, tankage, and clearance figures.
src:
Trawler Forum, 'Ocean Alexander 426 vs OA 450 classico sedan'
Your move: Get the HID (hull identification number) from the transom and confirm the exact model and year directly with Ocean Alexander in Seattle before making an offer.
Range & fuel
CLAIM
Generous tankage gives a comfortable Loop range at displacement speed
Closely related OA 456 boats list fuel capacity in the 750-800 gallon range (e.g. 4 x 200 gal stainless tanks). Combined with modest burn at slow speed, this implies large reserves for Loop legs. Actual tankage on the specific 450 must be confirmed, as it may differ from the 456.
src:
greatloop.org and Bayview Yachts OA 456 listings
Your move: Confirm the actual fuel capacity and number/material of tanks on this specific hull from the builder's spec or a tank inspection.
CLAIM
Burn drops sharply at Loop speeds
No fuel-flow data measured on an OA 450 specifically was found; these figures come from the same Cat 3116/3126 engines in similar-weight boats. Owners report roughly 6 gph total near 1500 rpm (~9.7 kts) and as low as ~3 gph total near 8 kts, versus roughly 39 gph total at fast cruise (~2400 rpm). Treat as approximations until measured on the actual boat.
src:
Club Sea Ray, 'Cat 3116 & 3126 Fuel Burn'; The Hull Truth
Your move: Log actual fuel burn versus speed during sea trial at 8-10 kts to establish real range.
Air draft
CLAIM
Folding radar arch tends to set the true air draft
These boats carry a flybridge with a radar arch that on many hulls can fold to reduce height; a related 456 broker noted clearance under ~13 ft with the arch folded. Antennas, arch, hardtop and any dinghy/canvas all add to real cruising height, and used boats are often modified so two same-model boats can differ. The buyer must measure the actual air draft in cruising trim and identify what folds or unships.
src:
Great Loop Yacht Sales, OA 456; TheCenterOf Great Loop Bridge Clearance Guide
Your move: Measure the boat's true air draft with everything in travel position, and confirm exactly what lowers (arch, antennas, mast) and how much height each saves.
Hull & deck
QUESTION
How extensive is the gelcoat spider-cracking, and has any refinishing been done?
The most consistently reported issue on OA boats of this era is widespread gelcoat spider-cracking, attributed by forum analysis to gelcoat applied too thick (to prevent print-through). Owners report cracks appearing broadly, not just at stress points, and refinishing quotes running into five and even six figures on larger OA hulls. This is a genuine resale and cost consideration for the model family, though severity varies boat to boat.
src:
Trawler Forum, 'Ocean Alexander Gelcoat issues' and 'Ocean Alexander 48 classic'
Your move: Have the surveyor document the extent of spider-cracking across the whole boat, get any prior refinishing history in writing, and obtain a refinish quote if cracking is significant before finalizing price.
Reading the boat
CONTEXT
Gelcoat cracking here is a construction trait, not owner neglect
Owners emphasize the cracking on these boats is not caused by acid washing or poor care but by the original build's thick gelcoat. Do not read spider-cracking as a sign of a poorly maintained boat, and conversely do not assume a well-kept boat is free of it. Judge it on its own merits with a surveyor.
src:
Trawler Forum, 'Ocean Alexander Gelcoat issues'
Engines
The engines research — factory options, tested performance,
and the engine-specific questions our members' dossiers carry — is part of the
full profile inside the product. It travels with every dossier and survey brief
built on this model.