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The KD860 |
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Hello Chuck
It is some time ago that I wrote to you. As a keen
reader of your unique magazine I admire the enthusiasm
of your writer/readers a lot.
In the meantime I finished the design of the KD 860.
A 28 ft long cruising catamaran. Again in the plywood/glass/epoxy
system. I believe I found, with this design, a good
compromise between creature comfort and efficient
sailing behavior. Through the low silhouette of the
boat, she will also sail well when reefed down. With
a draft of only 0,4 m (rudders up) the boat can enter
harbours and coves a lot of boats with the same length
can not enter. But the boat will go to windward like
any good mono hull.
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I believe
I found, with this design, a good compromise
between creature comfort and efficient
sailing behavior.
(click
images to enlarge) |
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This is our smallest offshore cruiser. A seaworthy
fast cruising catamaran for a family of four. The
performance of this boat will be exceptional on all
courses to the wind. To make sure of this, the boat
is light and has a low streamlined profile for windward
performance. The study plans include diagrams for
speed prediction and dynamic stability, so you can
see for yourself.
The hulls have the proven trapezoid cross section
of the PELICAN.
For windward performance the boat has anti-vortex
panels. These work a lot better as low aspect ratio
keels and are not as prone to damage as boards. Besides,
why spoil one of the best advantages of a multihull,
low draft, to enter coves etc a keel boat never can
enter? For an explanation how these work go to this
article.
| The study
plans include diagrams for speed prediction
and dynamic stability, so you can see for
yourself. |
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The boat is, like all our boats, of (ply)wood/glass/epoxy
composite construction. Any handy amateur can build
this boat without difficulties or surprises. Construction
time will be around 1200 hours.
Designing a catamaran in this size is a challenge
if you don't want to end up with a floating caravan.
I used our practical experience with our Pelican
to design this boat.
The maximum height in the central cabin is 1.48 m.
I found the solution for reasonable ergonomics by
using 3 entrances. To step in the hulls, the port
or starboard entrance is used. The central entrance
is very convenient to step in the central seating
area. As shown in the drawing below, there is ample
seat height in the central cabin. There is standing
height (1,95m) in the hulls.
The trapezoid shaped hulls have a fine entrance.
The length to beam ratio of the hulls is 1:11. This
will guarantee a fast boat.
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Any handy
amateur can build this boat without difficulties
or surprises. Construction time will be
around 1200 hours. |
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The boat is relatively low with good aerodynamic
properties. Even with shortened sails the boat will
go to windward. A factor often forgotten. There is
sufficient room for four persons for extended voyages.
CONSTRUCTION
The boat is designed in a way that even first time
boat builders can build the boat without difficulties.
All 32 CAD drawings are to a scale of (1:1). A 32
page description will aid you building the boat. All
our 26 years of experience designing boats for amateurs
is flowing into this design. We chose again plywood
as basic material for availability world wide and
cost efficiency.
Legend
1 - floor
2 - bridge deck stringer
3 - door
4 - chard table /navigation
5 - book/instruments shelf’s
6 - deck stringers
7 - hatch 450x380 mm
8 - vertical mast bulkhead 12 mm plywood
9 - lockers
10 - two persons bunk
11 - pantry
12 - U settee for up to 6
Plans:
Plans are delivered as E-book, 32 pages description
and 32 1:1 CAD drawings - $320
Study plans consist of 16 pages and include 10 pictures,
a short construction description table of contents
of the plans and the list of materials - available
for $15
https://www.ikarus342000.com/P86page2.htm
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