Irwin 40 MKII

1980
Designer
Ted Irwin
Builder
Irwin Yachts
Associations
?
# Built
?
Hull Type
Fin w/spade rudder
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 lbs / 7,661 kg
Ballast
6,500 lbs / 2,948 kg (Lead)
drawing

Rig and Sails

Type
Masthead Sloop
Reported Sail Area
737 ft2 / 68.5 m2
Total Sail Area
737 ft2 / 68.5 m2
Mainsail
Sail Area
324.5 ft2 / 30.2 m2
P
43 11 / 13.4 m
E
14 9 / 4.5 m
Mast Height
?
Foresail
Sail Area
412.5 ft2 / 38.3 m2
I
50 0 / 15.2 m
J
16 6 / 5 m
Forestay Length
52 7 / 16.1 m

Auxilary Power

Make
Yanmar
Model
2QM20
HP
?
Fuel Type
Diesel
Fuel Capacity
40 gal / 151 l

Accomodations

Water Capacity
100 gal / 379 l
Holding Tank Capacity
?
Headroom
?

Calculations

Hull Speed
7.48 knots
Sail Area/Displacement
17.91
good performance
Ballast/Displacement
38.48
less stiff, less powerful
Displacement/Length
248.98
moderate
Comfort Ratio
27.27
coastal cruiser
Capsize Screening
1.9
better suited for ocean passages

Notes

Shoal Draft vers: 4.25’ Bal. 7000 lbs.
Keel/CB vers: BU 4.25’ BD 9.5’. Bal. 7000 lbs.
Similar to IRWIN 39/40 CITATION.


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