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Seller's Description

O’day made this boat in two versions, one standard and one deluxe. This boat is the deluxe version. It has the teak and holly flooring, the traveler is mounted on the cabin top instead of in the cockpit, it has self-tailing winches and roller furling was standard. The interior has standing head room through out. It has two large settees in the main cabin, a large quarter berth and a vee berth forward. It has four opening port windows along with two large tinted side windows with curtains. It has a ice box and a sink with hot and cold pressure faucet. It comes with a one burner gas cook top and AC refrigerator. There is a an attractive fold-up table in the main cabin. It has a newer head, holding tank, and a macerator pump. It has a small sink forward. It has a marine style hot water heater and it also has exhaust heating when the engine is on.

Equipment: It has a 150 percent genoa on a furler and a newer North brand main sail that is still crackles when touched. It has a travel on to of the main cabin along with a boom vang. The main winches are self tailing. All lines feed into the cockpit. It has a blue bimini with SS rigging. It has a main sail cover, a steering wheel cover, a companionway cover, and winch covers. All the canvas is royal blue. It has a Edson steering wheel with a binnacle mounted compass and engine controls along with a Garman GPS chartplotter. There is a complete set of deluxe cockpit cushions. It has a two cylinder Universal diesel that is in good working order. It has two anchors and an anchor locker forward. The main anchor has roughly thirty feet of chain on the rode. It has a full set of dock fenders and all the required safety gear aboard. It has the double life line and bow and stern rails too. The exterior wood has been recently varnished. This boat sails well. It is easy to use and as far as I know is not in need of any work.

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Specs

Designer
Raymond Hunt (C.R. Hunt & Assoc.)
Builders
Bangor Punta Corp.
O'Day Corp.
Associations
?
# Built
507
Hull
Monohull
Keel
Fin
Rudder
Spade
Construction
FG

Dimensions

Length Overall
27 11 / 8.5 m
Waterline Length
22 11 / 7 m
Beam
10 2 / 3.1 m
Draft
4 7 / 1.4 m
Displacement
7,300 lb / 3,311 kg
Ballast
2,550 lb / 1,157 kg

Rig and Sails

Type
Sloop
Reported Sail Area
370′² / 34.4 m²
Total Sail Area
370′² / 34.4 m²
Mainsail
Sail Area
153′² / 14.2 m²
P
30 6 / 9.3 m
E
10 0 / 3.1 m
Air Draft
40 1 / 12.2 m
Foresail
Sail Area
217′² / 20.2 m²
I
35 11 / 11 m
J
12 0 / 3.7 m
Forestay Length
37 11 / 11.6 m

Auxilary Power

Make
Universal
Model
12
HP
10
Fuel Type
Diesel
Fuel Capacity
18 gal / 68 l
Engine Hours
?

Accomodations

Water Capacity
25 gal / 95 l
Holding Tank Capacity
?
Headroom
?
Cabins
2

Calculations

Hull Speed
6.9 kn
Classic: 6.42 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

6.93 knots
Classic formula: 6.42 knots
Sail Area/Displacement
15.7
<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.
15.73
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
34.9
<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

34.94
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
270.2
200-275: 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
270.18
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
20.6
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
20.62
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
2.1
>2.0: better suited for coastal cruising

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
2.11
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

A keel/cb verion of the the O’DAY 28 was also available. Draft BU: 3.25’, BD: 6.83’
Later, the the keel/cb version was dropped in favor of a shoal draft fixed keel: Draft:3.67’
Deeper keel: Draft:4.67’/ 1.42m
Alternate tall rig:
I: 38.00’ / 11.58m
J: 12.08’ / 3.68m
P: 32.50’ / 9.91m
E: 10.00’ / 3.05m

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