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1973 Irwin 23

Listed
Expired
$4,000 USD

Seller's Description

1973 Irwin 23 in VERY GOOD condition.

CONDITION: This Irwin 23 is overall in very good condition. This was a one owner boat and extremely well cared for with upgrades and repairs made regularly throughout its life. She promises many more years of great memories on the water for her new owner!

SOLD AS IS, WHERE IS. All information included in this listing is accurate to the best of our knowledge. This boat has a clear Illinois title and is a donation to Nautical Donations Inc. which is a 501(c)(3) organization. Proceeds of the sale will benefit non-profits in the greater Chicago area. For inquiries and to arrange an appointment to see the boat in person, please contact NAUTICAL DONATIONS at (773)672-2080 or email info@nauticaldonations.org

Equipment: Boat Name “Sundog” 1973 Irwin 23 Hull Identification Number 144 MORC Rating: 17.5 to 18.0

Specs Keel: Centerboard

Dimensions LOA: 23 ft 0 in Beam: 8 ft 0 in LWL: 18 ft 6 in Minimum Draft: 2 ft 5 in Maximum Draft: 5 ft 9 in Displacement: 3200 lbs Ballast: 1500 lbs Bridge Clearance: 31 ft 6 in Headroom: 5 ft 2 in

Outboard Engine 2009 9.9HP Yamaha T8EXH Type: 4Stroke; long shaft (users manual included)

Added Equipment: Bow pulpit, lifelines (replaced 2015) and stanchions, Compact II marine toilet (no holding tank), Ritchie compass, DMI Marine depth finder (functionality unknown), sail cover new in 2014, interior boat cushions new in 2011, cockpit boat cushions, anchor with line, two boat fenders, dock lines, boat hook, manual bilge pump.

Retractable centerboard has been fixed in up position for approx. 25 years, sails well. Ability to retract centerboard can be restored if desired.

Rudder replaced in 2015

Teak replaced in 2011

Sails: Doyle mainsail and genoa, new in 2011; original main and jib included as back-up sails. Sail cover, 2014.

Disclaimer The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.

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Specs

Designer
Ted Irwin
Builder
Irwin Yachts
Association
Irwin Yacht Owners
# Built
?
Hull
Monohull
Keel
Stub + Centerboard
Rudder
Spade
Construction
FG

Dimensions

Length Overall
22′ 11″ / 7 m
Waterline Length
18′ 6″ / 5.6 m
Beam
8′ 0″ / 2.4 m
Draft
2′ 5″ / 0.7 m — 2′ 5″ / 0.8 m
Displacement
3,200 lb / 1,451 kg
Ballast
1,500 lb / 680 kg (Lead)

Rig and Sails

Type
Sloop
Reported Sail Area
256′² / 23.8 m²
Total Sail Area
288′² / 26.8 m²
Mainsail
Sail Area
153′² / 14.2 m²
P
25′ 0″ / 7.6 m
E
12′ 2″ / 3.7 m
Air Draft
?
Foresail
Sail Area
135′² / 12.6 m²
I
28′ 6″ / 8.7 m
J
9′ 6″ / 2.9 m
Forestay Length
30′ 0″ / 9.2 m

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?
Engine Hours
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
6.6 kn
Classic: 5.76 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

6.59 knots
Classic formula: 5.76 knots
Sail Area/Displacement
18.9
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.
18.86
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
46.9
>40: stiffer, more 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

46.86
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
225.4
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
225.4
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
15.5
<20: lightweight racing boat

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
15.49
<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
2.2
>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
2.17
<2: better suited for ocean passages
>2: better suited for coastal cruising

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

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