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Barry
Hutchins pod for his Tiki 31 "Tigris" |
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click on
images for larger version |
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While
Tigris (ex Tripletime) was out of the water for its annual antifouling in
1999, I removed the two units of wooden deck slats that are normally
located behind the front mast between main beams 1 and 2. These are
supported and bolted to four cross bars as per the design with their ends
fitting into slots in three longitudinal support webs located between the
two beams. Removing the slats with the attached cross bars and the central
support web left an open space in the bridge deck measuring 2.0 X 1.37 m,
which is a reasonable size for a small cabin. I then placed four new cross
bars across this space to fit into the slots as above. Two pieces of 9 mm
marine ply (each approx. 2 X 0.6 m leaving a gap of about 170 mm down the
middle between the two halves) were screwed down to these bars to make a
firm base for the pod. This base was then removed, and taken home on my
car's roof racks (the slats were replaced on the bridge deck of the yacht
so I could continue sailing). The real work of building the pod now
commenced in the comparative comfort of my house's courtyard. |
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My
design of the pod is shown in the plans. I went for the boxy look, mainly
to match the rest of the yacht, but also to make construction simple. I
first added solid wooden sides (18 X 90 mm) to give some rigidity to the
base (glued with thickened epoxy only), then removed all the screws from
the cross bars (one bar at a time). After gluing each bar to the ply base
with epoxy, I screwed the screws back in to hold the bars in place. When
the glue had set, all the screws were removed and the screw holes filled
with epoxy. The base was then turned over and the footwell and locker
constructed using 9 mm ply, thickened epoxy and copper stitches (no screws
were used in any of the following construction). A keel-like strengthener
was glued to the bottom of the footwell, and two central pads added for
supporting the front and rear ends of the pod (corresponding supports were
already on main beams 1 and 2 as per Wharram's design for holding the
central support web in position). All joins were filleted with thickened
epoxy, then taped with 6 oz fibreglass cloth. |
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Afterwards,
the whole bottom was glassed with 6 oz cloth. Upon filling and sanding
(and filling and sanding and......), the bottom was sprayed with two part
undercoat and then turned over. Those portions of the cross bars and ply
over the footwell area were then cut with a jigsaw and removed, and
construction of the cabin's sides and roof commenced (the internal
surfaces of the footwell and locker were first filleted, taped and then
glassed). All external sides of the 9 mm ply panels for the cabin sides
were glassed with one coat of 6 oz cloth before fitting, but leaving a
wide unglassed margin along all borders to be taped with glass later. The
internal sides were given two coats of epoxy. After gluing in place
(making use of numerous clamps as well as copper stitches), the internal
joins were filleted and taped with 6 oz cloth. The external joins were
then taped with glass. Ply vertical supports (150 X 9 mm) were added to
the middle of each internal side to strengthen the cabin walls. Also the
opening in the rear bulkhead was strengthened by adding solid wooden
supports, to be later used as slides for holding the wash boards in
position. Finally the cabin inside and out was faired, and then sprayed
with two coats of two part undercoat, followed by two coats of two part
polyurethane paint. Spraying the inside of the pod was an especially
difficult job and I wouldn't wish this on my worst enemy (or my
mother-in-law). Fortunately I was wearing a full spraying mask connected
to the blower hole on a new barrel vacuum cleaner by a very long hose,
which worked extremely well for a home made contraption, producing dry
clean air. |
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The
hatch unit with its sliding perspex cover was then screwed into place (so
it can be later removed if the seals need replacing). This new design of
mine works beautifully and has not allowed one drop of water into the
cabin, which must be a world's first for a sliding hatch (the hatches on
the other cabins, as per Wharram's design, leak something fierce in storm
conditions at sea). |
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The
pod was then placed on a standard box trailer and returned to my cat,
which was again out of the water for its annual antifouling (yes! the pod
took me a year to build and fit out). The pod was lifted into position
using the halyard block on the front mast, and then after a few minor
modifications, the pod was dropped into place. After it was fastened in
place with rope tie-downs (as the deck slats had been), I drilled a hole
centrally through the front main beam into the front of the cabin and a
similar hole through the second main beam into the rear of the cabin.
After sealing the holes with epoxy, and re-drilling a slightly smaller
diameter, I placed a 16 mm stainless steel bolt in each hole, thus bolting
the pod on its central axis to the two beams. Even though the pod is fully
supported on four sides by the wooden support webs and central blocks on
the two main beams as designed for the slat units, it is further supported
by the bolts around which it can rotate when the rope tie-downs stretch.
So far it has worked perfectly (well at least in winds to 30 knots). |
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The
yacht sails very well, and is not affected by the small additional weight
forward (I built the pod using gaboon ply and white meranti), or the
additional windage. The foot of the sail drags a little across the top of
the pod, but this doesn't affect its tacking ability (I plan to raise the
mast slightly to overcome this). The bottom of the footwell is about 600
mm above the water so pounding is not a problem. The view from inside the
pod is exceptional, and when the sea conditions are rough, it provides a
fantastic shelter for navigating, resting or just a chat with the crew. |
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This page was last updated on 26-Oct-2001
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