Seller's Description
Irwin 40 in very good condition. Vessel was rebuilt by professional boat builder. Many upgrades through the years. Interior redone with Ultra suede headliner, solid surface counter tops, new cushions and mattresses. Many custom cabinets to increase storage through out. High quality vinyl teak and holly flooring. Exterior has custom radar arch with 2, 400 watt wind generators and 900 watts solar. Additional aft princess seats. Deck painted with 2 part poly paint with all soft or wet core repaired. New lifelines with 4 gates for easy access. Mast and rigging replaced in 2010 with Hood Stowaway mast. Sails in good to fair condition but serviceable. Electrical and plumbing upgraded and replaced where needed. 2000 watt inverter. Additional 40 amp battery charger. New electrical panels. Two 30 amp 120 VAC shore power inlets. 16k AC in salon new in 2019. New 6k air conditioner in forward cabin and salon new in 2021. New Deisel heater in 2021. Two Adler Barbour 12 volt refrigeration with new refer box. Pur 80 water maker. Newer Raymarine electronics with E127 plotter with radar. E90 plotter at nav station. Raymarine below deck autopilot and separate wheel pilot as backup. Icom VHF with helm remote. Icom 710 SSB. Standard Horizon AWI. Engine is Yanmar 3QM30 27 HP approximately 5000 hours. Runs good no oil leaks. New fuel tank replaced in 2024. Way too many improvements to list all here. If serious please ask. Vessel is located in Oriental NC and ready to go cruising. Only selling due to getting a bigger boat.
Specs
- Designer
- Ted Irwin
- Builder
- Irwin Yachts
- Association
- Irwin Yacht Owners
- # Built
- ?
- Hull
- Monohull
- Keel
- Fin
- Rudder
- Skeg
- Construction
- FG
Dimensions
- Length Overall
- 39′ 11″ / 12.2 m
- Waterline Length
- 31′ 2″ / 9.5 m
- Beam
- 12′ 6″ / 3.8 m
- Draft
- 5′ 6″ / 1.7 m
- Displacement
- 16,890 lb / 7,661 kg
- Ballast
- 6,500 lb / 2,948 kg
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 769′² / 71.4 m²
- Total Sail Area
- 768′² / 71.4 m²
Mainsail
- Sail Area
- 339′² / 31.5 m²
- P
- 45′ 11″ / 14 m
- E
- 14′ 9″ / 4.5 m
- Air Draft
- 56′ 7″ / 17.3 m
Foresail
- Sail Area
- 429′² / 39.9 m²
- I
- 52′ 0″ / 15.9 m
- J
- 16′ 6″ / 5 m
- Forestay Length
- 54′ 6″ / 16.6 m
Auxilary Power
- Make
- Yanmar
- Model
- 2GM20
- HP
- ?
- Fuel Type
- Diesel
- Fuel Capacity
- 40 gal / 151 l
- Engine Hours
- ?
Accomodations
- Water Capacity
- 100 gal / 379 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
- Sail Area/Displacement
-
18.7
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
-
38.5
<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
-
249.0
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
-
27.5
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
-
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
Notes
Fixed keel shoal draft: 4.3’
Keel/CB - BU: 4.3’/BD: 9.5’
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