Seller's Description
1985 O’Day 31 in very good condition. Turnkey boat equipped for cruising or racing. All lines lead aft to cockpit for easy handling.
Equipment: Main sail and 150% Genoa in good condition. UV protection on Genoa. Jib in great condition. Asymmetrical spinnaker in good condition. 2 symmetrical spinnakers in great condition. Newer stainless boom vang. Newer mainsheet traveler. 5 self tailing winches and 2 non self tailing. M-18 Universal Diesel 14HP Raymarine Axium 9 multifunction display. Nexus depth, wind, speed. Garmin GMI 20 instrument display. Raymarine autopilot. VHF radio. AIS receiver. 400 watt of solar with MPPT charge controller. Newer Magma grill. Omni stovetop oven. Ice box fitted with Frigoboat air cooled condensing unit. 1200 watt inverter. 2 TV’s Newer hot and cold water system. 12 volt battery charger. 120 volt shorepower. Full cockpit cushions in great condition. Partial canvas cockpit enclosure with full screen. 2 new Duracell Group 31 flooded deep cycle house batteries. 1 starter battery. 30 pound Mantus M1 anchor. Delta secondary anchor. Bottom paint 2024. Older Quicksilver 300 dinghy with Mercury 2.5 4 stroke engine.
Specs
- Designer
- Raymond Hunt (C.R. Hunt & Assoc.)
- Builders
- Bangor Punta Corp.
- O'Day Corp.
- Associations
- ?
- # Built
- 150
- Hull
- Monohull
- Keel
- Fin
- Rudder
- Spade
- Construction
- FG
Dimensions
- Length Overall
- 31′ 0″ / 9.5 m
- Waterline Length
- 25′ 10″ / 7.9 m
- Beam
- 10′ 11″ / 3.4 m
- Draft
- 4′ 11″ / 1.5 m
- Displacement
- 10,100 lb / 4,581 kg
- Ballast
- 3,800 lb / 1,724 kg
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 436′² / 40.5 m²
- Total Sail Area
- 436′² / 40.5 m²
Mainsail
- Sail Area
- 173′² / 16.1 m²
- P
- 33′ 9″ / 10.3 m
- E
- 10′ 2″ / 3.1 m
- Air Draft
- ?
Foresail
- Sail Area
- 263′² / 24.5 m²
- I
- 39′ 9″ / 12.1 m
- J
- 13′ 3″ / 4 m
- Forestay Length
- 41′ 10″ / 12.8 m
Auxilary Power
- Make
- Universal
- Model
- ?
- HP
- 14
- Fuel Type
- Diesel
- Fuel Capacity
- 25 gal / 95 l
- Engine Hours
- ?
Accomodations
- Water Capacity
- 25 gal / 95 l
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- 1
Calculations
- Hull Speed
-
7.5 kn
Classic: 6.82 kn
Hull Speed
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Formula
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
- Sail Area/Displacement
-
14.9
<16: under powered
Sail Area / Displacement Ratio
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
Formula
SA/D = SA ÷ (D ÷ 64)2/3
- SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D: Displacement in pounds.
- Ballast/Displacement
-
37.6
<40: less stiff, less powerful
Ballast / Displacement Ratio
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Formula
Ballast / Displacement * 100
- Displacement/Length
-
259.9
200-300: moderate
Displacement / Length Ratio
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
Formula
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
- Comfort Ratio
-
24.1
20-30: coastal cruiser
Comfort Ratio
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Formula
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
- D: Displacement of the boat in pounds
- LWL: Waterline length in feet
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
- Capsize Screening
-
2.0
<2.0: better suited for ocean passages
Capsize Screening Formula
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
Formula
CSV = Beam ÷ ³√(D / 64)
- Beam: Width of boat at the widest point in feet
- D: Displacement of the boat in pounds
Notes
Updated/extended version of O’DAY 30/RANGER 30. (1977?)
Available with shoal draft keel. Draft: 4.0’.
This listing is presented by SailboatListings.com. Visit their website for more information or to contact the seller.
