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Seller's Description

The owner bought this boat in 2008

General condition and any additional information

This boat is currently listed for sale through Torresen Marine brokerage, Muskegon, MI. We, the sellers, are willing to show the boat to interested parties. This boat is well worth the current $19,300 asking price, however, we are willing to listen to reasonable offers. Call: 231-557-0368

Standard features

1983, 313 Irwin Sailboat. Beautiful boat with many upgrades. This boat has been meticulously maintained by the owner. You have to see this boat to appreciate the condition. Ready to be launched for a summer of sailing pleasure. Sails are in excellent to very good condition. Sail inventory includes a mainsail new in 2018, 150% Genoa very good condition, 110% jib never used like new condition, back-up mainsail fair condition. Asymmetrical spinnaker with dousing sleeve, red, white and blue, very good condition. Head sail has roller furling. The bottom paint has been redone and its ready for launch. The engine is a very reliable Yanmar 15HP diesel. The cabin is very comfortable with sleeping for 4 - 6 people. The boat comes with a winter storage cradle. We will assist with the pre-launch rigging. All running rigging is removed at the end of the season and is hand washed and stored inside. The batteries are also removed for inside winter storage and the charge is maintained throughout the storage season. The cost of the launch is included in the purchase price.

Improvements to the hull, deck, rigging, engine, or interior

Batteries, replaced in 2019 Potable water pump, replaced in 2019 Racor fuel filter installed in 2018 Jabsco head replaced in 2018 Mainsail replace 2018 Electronics replaced in 2012

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Specs

Designer
Ted Irwin
Builder
Irwin Yachts
Association
Irwin Yacht Owners
# Built
?
Hull
Monohull
Keel
Fin
Rudder
Skeg
Construction
FG

Dimensions

Length Overall
40 9 / 12.4 m
Waterline Length
31 2 / 9.5 m
Beam
12 2 / 3.7 m
Draft
6 3 / 1.9 m
Displacement
16,890 lb / 7,661 kg
Ballast
?

Rig and Sails

Type
Sloop
Reported Sail Area
738′² / 68.6 m²
Total Sail Area
738′² / 68.6 m²
Mainsail
Sail Area
326′² / 30.3 m²
P
43 11 / 13.4 m
E
14 9 / 4.5 m
Air Draft
?
Foresail
Sail Area
412′² / 38.3 m²
I
50 0 / 15.2 m
J
16 6 / 5 m
Forestay Length
52 7 / 16.1 m

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
40 gal / 151 l
Engine Hours
?

Accomodations

Water Capacity
90 gal / 341 l
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
8.3 kn
Classic: 7.48 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

8.29 knots
Classic formula: 7.48 knots
Sail Area/Displacement
17.9
16-20: good performance

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.
17.94
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
?

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

?
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
249.0
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
249.03
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
27.3
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
27.27
<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
1.9
<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
1.9
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

See IRWIN 39 CITATION which appears very similar.
Fixed keel shoal draft: 4.39’
Keel/cb: BU: 4.25’/BD: 7.0’

This listing is presented by SailboatOwners.com. Visit their website for more information or to contact the seller.

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