Irwin 1/2 Ton MKII

1977
Designer
Ted Irwin
Builder
Irwin Yachts
Associations
?
# Built
?
Hull Type
Lifting Keel
Construction
FG

Dimensions

Length Overall
31 11 / 9.8 m
Waterline Length
24 4 / 7.4 m
Beam
11 3 / 3.5 m
Draft
3 6 / 1.1 m 6 5 / 2 m
Displacement
7,300 lbs / 3,311 kg
Ballast
3,500 lbs / 1,588 kg (Lead)

Rig and Sails

Type
Masthead Sloop
Reported Sail Area
412 ft2 / 38.3 m2
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Mast Height
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
Yanmar
Model
?
HP
12
Fuel Type
Diesel
Fuel Capacity
14 gal / 53 l

Accomodations

Water Capacity
28 gal / 106 l
Holding Tank Capacity
?
Headroom
?

Calculations

Hull Speed
6.62 knots
Sail Area/Displacement
17.52
good performance
Ballast/Displacement
47.95
stiffer, more powerful
Displacement/Length
223.79
moderate
Comfort Ratio
16.55
lightweight racing boat
Capsize Screening
2.34
better suited for coastal cruising

Notes

According to Irwin documentation, as compared to the first version, the MKII has a transom hung rudder, drop/dagger keel, (draft is the same) softer chine and broader beam aft.


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