The design of this catamaran is from 2004. In the meantime the sail in many countries of the world.
From India, Karimun Jawa island, New Zealand. This is reflected at the different photos shown. The boat, which was built in India. It was sailed, the whole treacherous coastline India. A distance of 2600 miles.

Construction is as always the time proven wood/glass/Epoxy composite system. This approach combines the natural strength and flexibility of wood with the durability and waterproofing properties of fiberglass cloth and epoxy resin. The result is a strong and lightweight catamaran known for longevity and ease of maintenance.
The combination of multi-chine design and backdecker structure ensures that even amateur builders can achieve professional-quality results, with ample accommodation and lasting durability. See also the layout drawing.





Big storage areas (inside and outside)  makes the boat a perfect boat for extended vacations.
The plans show two sail plans. The first is a conventional fractional rig. The wishbone gaff rig has a roller reefing jackstay for fast main sail operation (see next page).  Engine choices, two outboard engines, each with about 5 HP, or a single center-mounted outboard.
Specification

Loa /Lwl                          7.50/7.75 m *
Beam                               4.50 m
Draft (ex. Rudder)                 0.30 m
Draft dagger board down            1.30 m
Weight empty   approximate       750.00 kg
Weight max. CWL                 1384    kg
Sail area sloop rig               28.60 m2
Sail area Wishbone gaff rig       27.60 m2
L : B ratio hulls                 1: 9 
B ratio hulls                     46,66% effective
Outboard engine about             2 x 5 Hp
Electric drive                    2 x 1.5 kW
* incl. rudder
Static righting moment             2.200 kgm

Plans          US $ 280,-   
Study plans         US $ 15,-             

 
ECO 75
For more information order get a study  plan


Copyright © 2025 by B. Kohler, K-designs
All rights reserved

The PLANS SET consists of
30 DXF drawings, a building instruction and a separate Wishbone sort of plan+ 24 pages of building instruction.
Scale of the drawings is 1 : 10 or 1 : 1.
Format DXF files.
4 picture pages  how  to built difficult parts


Some impressions