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Moody 31 · insideSail

Moody · 1983–1985

Moody 31

Cabins forward and aft, with fin and twin-keel versions. The Mark II adds a transom boarding platform and a forward-facing chart table.

CruiserEditorial classification

Overall length · LOA

9.37 m

Beam

3.2 m

Displacement

4,530 kg

Ballast

1,667 kg

Draught

1.52 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?

Cabins forward and aft, with fin and twin-keel versions. The Mark II adds a transom boarding platform and a forward-facing chart table.

Editorial interpretation. Categories overlap and are not certifications.

Understand sailboat types

Dimensions

Overall length · LOA Overall length · LOA	9.37 m	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.
Waterline length · LWL Waterline length · LWL	7.75 m	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.

Beam Beam	3.2 m	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.

Draught Draught	1.52 m	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.

Displacement Displacement	4,530 kg	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.

Ballast Ballast	1,667 kg	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.

Hull material	—	Data awaiting verification

Sailing characteristics

Keel Keel	Fin keel	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.
Rudder support Rudder support	—	Data awaiting verification
Rig Rig	—	Data awaiting verification
Steering Steering	—	Data awaiting verification
Sail area Sail area	40.26 m²	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.

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	36.8 %	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	14.95	Calculation & limits SA_ft² / (displacement_lb / 64)^(2/3) 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.
D/L D/L	271.22	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	24.75	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	1.95	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	6.76 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	90.9 L	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.
Water	136.3 L	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.

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	2	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Source-linked reference for this exact scope. Enclosed-cabin count excludes the saloon. Documentary verification; this is not a measurement of an individual boat.
Heads Heads	1	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.
Aft cabin Aft cabin	Yes	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.
Internal walkthrough Internal walkthrough	—	Data awaiting verification
Aft double berth Aft double berth	Yes	View source Moody 31 — historical technical documentation Published specifications and accommodation description Evidence confidence: Medium Checked against the source: 2026-10-09 Published reference from the cited document; verify individual boats separately. Documentary verification; this is not a measurement of an individual boat.
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.

Moody 31

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

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