Seller's Description
1981 Irwin 40 Citation
Strength, Durability & Performance
Ted Irwin designed and built the Citation 40 that one could easily compare to the Bill Lapworth designed Cal 40, or the Bob Perry designed Valiant 40, for their Strength, Durability & Performance.
Ted Irwin truly designed one of the top racer/cruiser class of boats with the Citation 40.
This boat design really brings out the best of the older style boats, both in performance and in looks. Current owner gets many comments about her good looks.
This Irwin 40 is blue water ready with little work needed for your offshore adventures.
Just stepping on to Vayu, you get the sense of how solidly built she is Vayu has been rebuilt over the years by a professional boat builder, marine engineer, and retired yacht surveyor after he purchased her in 2006. After purchasing another boat he is now ready to move on and let someone else enjoy the efforts of his labor.
Meticulously maintained by the current owner, he has truly done a remarkable job of upgrading and maintaining Vayu.
There is an immense amount of storage for one that my want to cross oceans or sail the Caribbean, or take extended cruises away from civilization. Storage has been greatly increased over that of your average production boat.
To view full specifications, photos and video, copy and paste the below into URL: https://www.curtisstokes.net/sloop-for-sale-irwin-40-vayu-2831295.html
Specs
- Designer
- Ted Irwin
- Builder
- Irwin Yachts
- Association
- Irwin Yacht Owners
- # Built
- ?
- Hull
- ?
- Keel
- Fin
- Rudder
- Skeg
- Construction
- FG
Dimensions
- Length Overall
- 39′ 11″ / 12.2 m
- Waterline Length
- 31′ 2″ / 9.5 m
- Beam
- ?
- Draft
- ?
- 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
- 3
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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