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Hull offset stations and centreline were
projected inside the hull and 6mm ply stringers glued, coved and
glassed in. Mountings for the aft cockpit bulkead ( to give
maximum aft deck length)installed. Transom stiffened and
supported. |
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Stringer grid completed with cockpit aft bulkhead
and side tanks installed. Supports for the floor join, hiking stap
mountings and mainsheet block glued and glassed in.
Stringers
needed too be this close together to allow the floor to be made from
6mm plywood. The floor is the heaviest and biggest single
piece of construction material. It has to be strong
enough to take the helmsman weight.
Centrecase
capping strengthened and lengthened with cedar and carbon fibre.
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To give maximum stiffness, station 3 and 4
bulkheads were glued, coved and glassed to both the side deck and
inside hull. Station 5 bulkheads are fully glassed to make the whole
aft end of the boat a bouyancy tank.
Bundles of closed cell
foam rods (the stuff kids use in swimming pools) were hung in the
side tanks to provide positive bouyancy in case the aft tank is
breached. |
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Foredeck stringers (cedar) installed and glassed
to the foam hull stringers. Front centrecase supports go
directly to the inside hull/deck join and hence the
gunnel.
Gunnels (not shown) was made from 4 strips of 6mm ply
bend around the exterior deck/hull join and screwed, glued, glassed
to form a very stiff, solid foundation for transferring the helmsman
righting momentum into the fordeck.
Bottom mast step
installed. Adjustment is by 10mm blocks (plus a 5mm one for fine
adjustment). Same thicknesses as the top mast step
adjustments. Makes it easy to move the mast forward or
backwards in the boat without losing mast rake (leech tension)
settings. |
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Centreboard slot supports in the case was
constructed from high modulus carbon fibre offcuts. Centrecase
needed extending to enable the centreboard to slide the 20mm fully
forward.
Bolt is 10mm and had a lug welded on later to
prevent rotation. Adjustments requires only one
spanner.
Because of the reduced centreboard arm area as
prescibed in the 2005 rules the centreboard slot position required
much mocking up (in full size cardboard templates) to get it to fit
in the centrecase. Centreboard was maximum size.
Too
high a centreboard bolt position while giving the desirable as close
to vertical leading edge, resulted in the top end of the trailing
edge chord projecting below the hull. Too low a centreboard
bolt position and the centreboard arm would project below the
centrecase capping. With 10mm to play with the best position ended
up being 45mm above the keel.
Even in this position the
amount of centreboard above the capping was minimal. Made it
difficult to install a stop plus allow for pulley and bungee cord
mountings. |
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Biggest decision to be made while designing the
rebuild was whether to go with the open front cockit (Devoti style)
or a closed cockit one (Vanguard/Lemieux style). Decided on a closed
cockpit to keep stiffness in the boat plus save weight.
There
doesn't seem to be a need for a false floor along the centrecase so
these were left out to save weight as well.
Thwart was
fabricated on the curve of the old traveller from 3 layers of 6mm
plywood. Screwed, glued and glassed to the centrecase in
maximum aft position with the ends screwed, glued and glassed
to pads on station 4 bulkheads. Thwart acts as a
stessed member of the hull to transfer loads from the helmsman and
centrecase into the boat.
Rebates in the centrecase capping
are for plastic inserts that will keep the centreboard in a vertical
position and make lifting and lowering easier by reducing the
contact area.
Cockpit coaming was fabricated from
cedar. |
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