Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.

We will occasionally send you relevant updates. You can opt out or contact us any time.
  • 1 / 14
  • 2 / 14
  • 3 / 14
  • 4 / 14
  • 5 / 14
  • 6 / 14
  • 7 / 14
  • 8 / 14
  • 9 / 14
  • 10 / 14
  • 11 / 14
  • 12 / 14
  • 13 / 14
  • 14 / 14

Seller's Description

You only need to know this boat to love it! Many older 25-foot sailboats are not worth much but those who know this Irwin 10/4 know there value. This boat has more cockpit leg room than most sailboats 10 feet longer. This wide boat 10 4 heels over very little making it popular with those who dont need to be hanging on for dear life the hole trip. Lots of storage. The sails are in good shape they are not original, and they have a lot of time left in them. Swing keel in good working order. The 8 hp Yammer diesel pushes her along nicely. This boat is considered the largest trailer sailor but has the stability and spaciousness of much larger boats. The recently bead blasted hull has been properly barrier coated 2x. All paint is Interlux Perfection. This boat is in great shape for her age. Her strong mahogany swim platform extends her ability to entertain her crew greatly. Easy and comfortable to sail. This Irwin will provide its new owner and crew with many summers of sailing Fun. Im 6 tall and can stand up in the cabin. Solid decks, solid boat.

She just waiting for her next lucky Captain & Crew!

Equipment: 1 set older sails 1 set newer sails 1 spinnaker . Plow anchor, swim platform,full cockpit cushions. Support stanchions.

Advertisement

Specs

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

Dimensions

Length Overall
25 0 / 7.6 m
Waterline Length
21 9 / 6.7 m
Beam
10 4 / 3.2 m
Draft
2 9 / 0.8 m 2 11 / 0.9 m
Displacement
7,000 lb / 3,175 kg
Ballast
2,000 lb / 907 kg

Rig and Sails

Type
Cutter
Reported Sail Area
396′² / 36.8 m²
Total Sail Area
395′² / 36.7 m²
Mainsail
Sail Area
185′² / 17.2 m²
P
30 1 / 9.2 m
E
12 2 / 3.7 m
Air Draft
?
Foresail
Sail Area
210′² / 19.5 m²
I
35 0 / 10.7 m
J
12 0 / 3.7 m
Forestay Length
37 0 / 11.3 m

Auxilary Power

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

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
1

Calculations

Hull Speed
6.5 kn
Classic: 6.26 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

6.54 knots
Classic formula: 6.26 knots
Sail Area/Displacement
17.3
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.
17.32
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
28.6
<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

28.57
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
300.9
275-350: heavy

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
300.89
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
20.9
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
20.93
<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
2.16
<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.

View on SailboatListings.com

Advertisement

Embed

Embed

Embed this page on your own website by copying and pasting this code.

Great choice! Your favorites are temporarily saved for this session. Sign in to save them permanently, access them on any device, and receive relevant alerts.

We will occasionally send you relevant updates. You can opt out or contact us any time.
Measurements:

©2024 Sea Time Tech, LLC

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.