Public preview · Explore the catalogue, guides, Boat Finder and comparison tool. Accounts and community contributions are temporarily unavailable.

insideSail…

O'Day 39 · insideSail

O'Day · Production dates awaiting documentation

O'Day 39

Reference dimensions published in a community source. Confirm each boat's configuration and condition; these transcriptions are not independent measurements.

Illustration

Generic illustration. It does not depict this model or its configuration.

Overall length · LOA

11.76 m

Beam

3.83 m

Displacement

8,164.66 kg

Ballast

2,993.71 kg

Draught

1.93 m

Enclosed cabins

—

Engine power

—

Cockpit

—

Published values checked against their source; each individual boat's condition and configuration may differ.

What kind of boat is this?

Reference dimensions published in a community source. Confirm each boat's configuration and condition; these transcriptions are not independent measurements.

Editorial interpretation. Categories overlap and are not certifications.

Understand sailboat types

Dimensions

Overall length · LOA Overall length · LOA	11.76 m	View source O'Day 39 — Wikipedia infobox, revision 1372536625 Infobox sailboat specifications, field loa; page 71997003, revision 1372536625 Exact titles reviewed from the discovered category and cached revision. Small dinghies, ambiguous identities and unresolved multi-builder relationships are excluded from this release; no country inferred. Source type: Community reference Wikipedia contributors, O'Day 39, revision 1372536625 (https://en.wikipedia.org/w/index.php?title=O%27Day+39&oldid=1372536625); factual fields converted to SI; changes recorded in field contexts. Licence: https://creativecommons.org/licenses/by-sa/4.0/ CC BY-SA 4.0 Evidence confidence: Low Checked against the source: 2026-10-09 Community reference. Source checking only verifies the dated transcription, not manufacturer accuracy, a surveyed individual boat, seaworthiness or configuration compatibility. Original published value: 38.58 Source-linked documented reference. Source type and confidence remain visible; verify the configuration of individual boats. Documentary verification; this is not a measurement of an individual boat.

Hull length	—	Data awaiting verification

Waterline length · LWL Waterline length · LWL	10.21 m	View source O'Day 39 — Wikipedia infobox, revision 1372536625 Infobox sailboat specifications, field lwl; page 71997003, revision 1372536625 Exact titles reviewed from the discovered category and cached revision. Small dinghies, ambiguous identities and unresolved multi-builder relationships are excluded from this release; no country inferred. Source type: Community reference Wikipedia contributors, O'Day 39, revision 1372536625 (https://en.wikipedia.org/w/index.php?title=O%27Day+39&oldid=1372536625); factual fields converted to SI; changes recorded in field contexts. Licence: https://creativecommons.org/licenses/by-sa/4.0/ CC BY-SA 4.0 Evidence confidence: Low Checked against the source: 2026-10-09 Community reference. Source checking only verifies the dated transcription, not manufacturer accuracy, a surveyed individual boat, seaworthiness or configuration compatibility. Original published value: 33.50 Source-linked documented reference. Source type and confidence remain visible; verify the configuration of individual boats. Documentary verification; this is not a measurement of an individual boat.

Beam Beam	3.83 m	View source O'Day 39 — Wikipedia infobox, revision 1372536625 Infobox sailboat specifications, field beam; page 71997003, revision 1372536625 Exact titles reviewed from the discovered category and cached revision. Small dinghies, ambiguous identities and unresolved multi-builder relationships are excluded from this release; no country inferred. Source type: Community reference Wikipedia contributors, O'Day 39, revision 1372536625 (https://en.wikipedia.org/w/index.php?title=O%27Day+39&oldid=1372536625); factual fields converted to SI; changes recorded in field contexts. Licence: https://creativecommons.org/licenses/by-sa/4.0/ CC BY-SA 4.0 Evidence confidence: Low Checked against the source: 2026-10-09 Community reference. Source checking only verifies the dated transcription, not manufacturer accuracy, a surveyed individual boat, seaworthiness or configuration compatibility. Original published value: 12.58 Source-linked documented reference. Source type and confidence remain visible; verify the configuration of individual boats. Documentary verification; this is not a measurement of an individual boat.

Draught Draught	1.93 m	View source O'Day 39 — Wikipedia infobox, revision 1372536625 Infobox sailboat specifications, field draft; page 71997003, revision 1372536625 Exact titles reviewed from the discovered category and cached revision. Small dinghies, ambiguous identities and unresolved multi-builder relationships are excluded from this release; no country inferred. Source type: Community reference Wikipedia contributors, O'Day 39, revision 1372536625 (https://en.wikipedia.org/w/index.php?title=O%27Day+39&oldid=1372536625); factual fields converted to SI; changes recorded in field contexts. Licence: https://creativecommons.org/licenses/by-sa/4.0/ CC BY-SA 4.0 Evidence confidence: Low Checked against the source: 2026-10-09 Community reference. Source checking only verifies the dated transcription, not manufacturer accuracy, a surveyed individual boat, seaworthiness or configuration compatibility. Original published value: 6.33 Source-linked documented reference. Source type and confidence remain visible; verify the configuration of individual boats. Documentary verification; this is not a measurement of an individual boat.

Displacement Displacement	8,164.66 kg	View source O'Day 39 — Wikipedia infobox, revision 1372536625 Infobox sailboat specifications, field displacement; page 71997003, revision 1372536625 Exact titles reviewed from the discovered category and cached revision. Small dinghies, ambiguous identities and unresolved multi-builder relationships are excluded from this release; no country inferred. Source type: Community reference Wikipedia contributors, O'Day 39, revision 1372536625 (https://en.wikipedia.org/w/index.php?title=O%27Day+39&oldid=1372536625); factual fields converted to SI; changes recorded in field contexts. Licence: https://creativecommons.org/licenses/by-sa/4.0/ CC BY-SA 4.0 Evidence confidence: Low Checked against the source: 2026-10-09 Community reference. Source checking only verifies the dated transcription, not manufacturer accuracy, a surveyed individual boat, seaworthiness or configuration compatibility. Original published value: 18000 Source-linked documented reference. Source type and confidence remain visible; verify the configuration of individual boats. Documentary verification; this is not a measurement of an individual boat.

Ballast Ballast	2,993.71 kg	View source O'Day 39 — Wikipedia infobox, revision 1372536625 Infobox sailboat specifications, field ballast; page 71997003, revision 1372536625 Exact titles reviewed from the discovered category and cached revision. Small dinghies, ambiguous identities and unresolved multi-builder relationships are excluded from this release; no country inferred. Source type: Community reference Wikipedia contributors, O'Day 39, revision 1372536625 (https://en.wikipedia.org/w/index.php?title=O%27Day+39&oldid=1372536625); factual fields converted to SI; changes recorded in field contexts. Licence: https://creativecommons.org/licenses/by-sa/4.0/ CC BY-SA 4.0 Evidence confidence: Low Checked against the source: 2026-10-09 Community reference. Source checking only verifies the dated transcription, not manufacturer accuracy, a surveyed individual boat, seaworthiness or configuration compatibility. Original published value: 6600 Source-linked documented reference. Source type and confidence remain visible; verify the configuration of individual boats. Documentary verification; this is not a measurement of an individual boat.

Published keel weight	—	Data awaiting verification

Hull material	Fibreglass / GRP	View source O'Day 39 — Wikipedia infobox, revision 1372536625 Infobox sailboat specifications, field construction Exact titles reviewed from the discovered category and cached revision. Small dinghies, ambiguous identities and unresolved multi-builder relationships are excluded from this release; no country inferred. Source type: Community reference Wikipedia contributors, O'Day 39, revision 1372536625 (https://en.wikipedia.org/w/index.php?title=O%27Day+39&oldid=1372536625); factual fields converted to SI; changes recorded in field contexts. Licence: https://creativecommons.org/licenses/by-sa/4.0/ CC BY-SA 4.0 Evidence confidence: Low Checked against the source: 2026-10-09 Community reference. Source checking only verifies the dated transcription, not manufacturer accuracy, a surveyed individual boat, seaworthiness or configuration compatibility. Source-linked documented reference. Source type and confidence remain visible; verify the configuration of individual boats. Documentary verification; this is not a measurement of an individual boat.

Sailing characteristics

Keel Keel	—	Data awaiting verification
Rudder support Rudder support	—	Data awaiting verification
Rig Rig	—	Data awaiting verification
Steering Steering	—	Data awaiting verification
Sail area Sail area	—	Data awaiting verification

Sail plan, sail condition and actual loading affect behaviour. A single number cannot predict performance.

Comfort and behaviour at sea

The indicators below help compare proportions. Interpret them alongside hull shape, mass distribution, loading, condition and sailing conditions.

Ballast / displacement Ballast / displacement	36.67 %	Calculation & limits 100 × ballast_kg / displacement_kg conventional-monohull-v1 A conventional indicator calculated from this configuration's published data. It is neither a safety certification nor a prediction of an individual boat's condition. Input sources are shown with the corresponding specifications.
SA/D SA/D	—	Insufficient compatible data
D/L D/L	213.74	Calculation & limits (displacement_lb / 2240) / (0.01 × LWL_ft)³ conventional-monohull-v1 A conventional indicator calculated from this configuration's published data. It is neither a safety certification nor a prediction of an individual boat's condition. Input sources are shown with the corresponding specifications.
Comfort Ratio Comfort Ratio	27.05	Calculation & limits displacement_lb / [0.65 × (0.7 × LWL_ft + 0.3 × LOA_ft) × beam_ft^1.333] conventional-monohull-v1 Compare boats of similar size and type. Underwater hull shape, mass distribution and actual wave response are not represented. Input sources are shown with the corresponding specifications.
Capsize Screening Formula Capsize Screening Formula	1.92	Calculation & limits beam_ft / (displacement_lb / 64)^(1/3) conventional-monohull-v1 A conventional indicator calculated from this configuration's published data. It is neither a safety certification nor a prediction of an individual boat's condition. Input sources are shown with the corresponding specifications.
Theoretical hull speed Theoretical hull speed	7.76 kn	Calculation & limits 1.34 × √LWL_ft conventional-monohull-v1 Conventional approximation for displacement hulls, not a rigid limit or a guaranteed cruising speed. Input sources are shown with the corresponding specifications.
Power per tonne Power per tonne	—	Insufficient compatible data

These calculations are not safety certificates. STIX and AVS require specific documentation; they are not estimated from these ratios.

Propulsion

Engine power Engine power	—	Data awaiting verification
Transmission Transmission	—	Data awaiting verification
Fuel Fuel	—	Data awaiting verification
Water	—	Data awaiting verification

The original engine may have been replaced. Power, propeller, transmission and conditions together determine real use; consumption and range are not inferred from power alone.

Interior & layout

Cockpit Cockpit	—	Data awaiting verification
Enclosed cabins Enclosed cabins	—	Data awaiting verification
Heads Heads	—	Data awaiting verification
Aft cabin Aft cabin	—	Data awaiting verification
Internal walkthrough Internal walkthrough	—	Data awaiting verification
Aft double berth Aft double berth	—	Data awaiting verification
Galley shape	—	Data awaiting verification
Galley level	—	Data awaiting verification
Headroom Headroom	—	Data awaiting verification

Enclosed cabins and saloon berths are different information. An internal aft walkthrough needs confirmation in the individual boat’s layout.

O'Day 39

What kind of boat is this?

Dimensions

Sailing characteristics

Comfort and behaviour at sea

Propulsion

Interior & layout

Known issues

Market

Owners in the community

Experiences & questions

Other models of a similar length

Alajuela 38

Albin Stratus 36

Alsberg Express 37