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DUO 425 Plans

LOA:
13' 11" / 4.25m
SKU:
BK-DUO425-ID
Availability:
Download after check out
$50.00

Description

The DUO 425 was the first parallel rig cat designed for amateur construction. The prototype was shown at the boat show in Duesseldorf in 1984. We have the most experience with this sort of rigs. Many very fast and record breaking catamarans used and use this configuration.

I have lost count how many DUO 425's are sailing worldwide, but it has to be more as 1000.

This is the easiest to build cat imaginable.

For example, a hull is built from only 16 main parts.
The boat can handle a lot of wind. We sailed the boat in a force 9 without any problem. And belief me, the boat is faaaast!

The hulls are wood/epoxy construction. Made from 4 sheets of 4 mm and one sheet of 8 mm plywood + 6 kg of epoxy. The rigs are two wind surfing rigs. There is an automatic vertical kick-up rudder. A sort of "matched hole technique" is used to line things up when building the hulls. The construction time is about 120 hours

Construction Steps:


working on a hull


The mast compartment with lower mast bearing


Hulls ready to be closed


The bow construction


Dagger board rudder with automatic click up system

 

Specifications
L.o.a. - 4.25 m
Beam - 2.10 m
Empty weight - 58 kg
Sails - up to 16 m²
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Additional Information

Measurement:
Metric
Designer Name:
Bernd Kohler
Sail area (Imperial / Metric):
172 sq. ft / 16 sq. m
Rig Type:
Biplane
Rudder:
Kick-up
Length (range):
8' - 15'11"' / 2.44m - 4.85m
LOA:
13' 11" / 4.25m
Length at Waterline:
13' 11" / 4.25m
Beam:
6' 11" / 2.1m
Hull Weight:
85 - 199 lbs / 38.56 - 90.27kg
Estimated Hull Weight:
128lbs / 58kg
Draft:
Under 6" / 15.24cm
Unloaded Draft:
6" / 0.152m
Weight Capacity:
200lbs / 91kg
Primary Material:
Marine Plywood
Method of Construction:
Stitch and Glue
Hull:
Multihull
Hull Type:
Planing
Hull Shape:
Flat bottom
Power Source:
Wind
Built-in Floatation:
Yes
Trailerable:
Yes
Cartop:
Yes
Unit of Measure:
Metric
Instruction Manual:
Step-by-Step Instructions
Lofting Required:
No
Recommended Experience Level:
Beginner
Designer's Thoughts on Experience Level:
Chuck Leinweber's suggestion
Boat Type:
Sailboat
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