O'Day 35

1984–1989 · designed by C. Raymond Hunt Associates · built by O'Day Corporation

The O'Day 35 was designed as an American production cruiser-racer aimed at the family coastal cruising market of the mid-1980s. It is a direct evolution of the O'Day 34 (produced 1981–1984), distinguished by a lengthened scoop transom and integral swim platform that added approximately 11.5 inches to the LOA. It prioritized interior volume and comfortable accommodations for its length over pure offshore capability. The boat has a reputation as a capable daysailer and coastal cruiser with reasonable upwind performance, though it was never intended as a bluewater passage-maker. Its widespread production and active owner community have kept parts and knowledge readily available.

This is a general read on the O'Day 35 class — informed background, not a verdict on any individual boat. Condition, refit history, and how a particular hull was sailed and stored matter far more than class reputation. Use it to know what to look for; for a read on a specific listing, run a free FairKeel report on that boat.

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At a glance

Hull form: Fin Keel
Ballast: Bolt On Iron
Rudder: Spade
Mast step: Keel Stepped
Hull construction: Fiberglass
Production: 1984–1989
Built in: United States

What the O'Day 35 is known for

Generous interior volume and headroom for a production 35-footer of its era — comfortable accommodations for coastal cruising with a family.
Widely produced with an active owner community; parts, documentation, and knowledgeable riggers and yards are relatively easy to find.
Balanced sail plan that is manageable short-handed; the boat is not easily overpowered in moderate conditions.
Keel-stepped mast provides a more secure rig attachment and is generally more repairable than a deck-stepped alternative.

Known trade-offs

Cored deck construction is prone to widespread water intrusion after 35–40 years, and repairs are expensive and labor-intensive.
Spade rudder with no skeg provides limited protection; rudder bearing wear and vulnerability to debris strike are concerns for offshore or high-mileage use.
Iron ballast keel is susceptible to surface rust and long-term corrosion at the keel-to-hull joint; keel bolts warrant close inspection on any hull of this age.
Chainplate geometry routes attachments through deck or cored structures, making corrosion and delamination common and difficult to inspect without removing headliner.
Interior joinery and upholstery quality is typical of 1980s American production boats — functional but not durable; most surviving hulls need significant below-decks cosmetic work.

Age-related quirks to expect

Deck core delamination and soft spots around deck hardware, chainplates, and the mast partner High 1984–1989 (all years)

Osmotic blistering on hull bottom below waterline — common on 1980s production fiberglass Medium 1984–1989 (earlier hulls most affected)

Original chainplate attachment through cored deck — corrosion and delamination of surrounding deck core is common and often hidden under headliner High 1984–1989 (all years)

Standing rigging age — most examples are well past service life; original rod or wire rigging past 20–30 years is a safety issue High Any hull with original or unreplaced rigging

Iron ballast keel is prone to surface rust and pitting over decades; keel-to-hull joint cracking can mask bolt corrosion Medium 1984–1989 (all years)

Systems to check before you buy

Deck core and hardware bedding priority: offshore, coastal, liveaboard

Cored deck construction throughout is prone to water intrusion at every hardware through-bolt — stanchion bases, cleats, sheet leads, and the mast collar. Probe all deck hardware with a moisture meter and press-test on deck for softness. Widespread delamination is a major structural repair, not a cosmetic one.

Chainplates and rig attachment priority: offshore, coastal, racing

Chainplates are through-bolted into the deck or a cored structure and are a known weak point on this class. Inspect for rust staining on headliner, weeping at deck penetrations, and check the actual chainplate strap for corrosion. This is a rig-loss risk if neglected.

Standing rigging priority: offshore, coastal, weekending

Any hull that has not had rigging replaced within the last 10–15 years should be treated as having life-expired wire. Check for cracked swage fittings, meat-hooks at the lower swages, and furling drum bearing condition. Mast should be pulled for a full inspection before offshore use.

Hull bottom and keel-to-hull joint priority: offshore, coastal, liveaboard

Inspect the keel-to-hull joint for cracking, weeping, or movement — a common sign of iron keel bolt corrosion or keel-strike history. Osmotic blistering is common below the waterline; severity ranges from superficial to deep laminate penetration. The iron ballast keel should be examined for significant pitting or rust that could compromise structural integrity or the bolt pattern.

Engine and drivetrain priority: coastal, liveaboard, motor

The O'Day 35 was delivered with a Universal M-25 or equivalent fresh-water-cooled diesel (not the Atomic 4 that earlier O'Day models used). Confirm which engine is installed, its hours, and whether the raw-water impeller, heat exchanger, and motor mounts have been serviced recently. Engine-mount and shaft seal condition varies considerably on boats of this age.

How it fits your plans

Offshore: Manageable for protected offshore passages in experienced hands, but the spade rudder, fin keel, and production-grade construction put this below the threshold most bluewater sailors would accept for extended ocean crossings. Standing rigging and chainplate condition are gating issues before any offshore use.
Coastal: This is the boat's natural habitat — it performs well as a coastal cruiser with comfortable accommodations for a couple or small family. Rig and deck hardware condition determine whether a given hull is ready to sail or a project.
Liveaboard: The interior volume is reasonable for a 35-footer and the layout works for one or two people living aboard at a dock. Limited tankage and a modest galley mean offshore liveaboard use is impractical; marina liveaboard is feasible on a tight budget.
Weekending: Well suited to weekend coastal sailing and racing. The cockpit is large and comfortable, and the sail plan is manageable for short-handed crews.
Racing: Competitive in PHRF club racing, particularly in one-design or similar-class fleets where these boats are still actively raced. Not a serious performance boat by contemporary standards, but capable in its era.

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