MAX POWER
METAL HULLS
: The mounting base may be constructed with the hull or
prefabricated, and then welded onto the hull later.
IMPORTANT: In both cases, the top surface of the mounting base ( the flange) must
be given
particular attention
and machined perfectly flat in order to accept the « O »
ring seal of the RETRACT base flange and ensure perfect water tightness.
The bolts fixing the RETRACT onto the mounting flange must be inserted from top to
bottom.
Provide sufficient access underneath the flange to allow for tightening the nuts. If the
access is not possible, provide a special mounting flange with metric 12 mm studs or
tapped holes.
CONSTRUCTION OF HULL OPENING & CLOSING PLATE
The required hull opening dimensions are: L = 516 mm x W = 300mm.
The longitudinal centre line of the opening coincides with that of the mounting flange.
But the transversal centre line of the opening is offset by 30 mm to the rear with
respect to the transversal centre line of the mounting flange.
The opening is closed by a plate that may be made from the cutout hull section, or
specially fabricated.
This closing plate should bear against a gasket fixed to a
20 mm wide rebate
when
in the raised position.
While the hull opening closing plate is being fabricated, the RETRACT must be
temporarily secured on the mounting base flange to facilitate correct closing plate
installation.
The closing plate
must be fixed
to a fabricated aluminium adjustable mounting (
which should have 6 elongated holes for final adjustment).
A gasket needs to be installed in the hulls rebate. This gasket can be made either out
off
sealed cell
neoprene rubber or moulded in «SIKAFLEX » (or a similar product) to
form a flexible seal Precaution must be taken to ensure that the flexible gasket does
not glue the closing plate to the hull while drying .The plate must rest evenly, on the
gasket with a reasonable pressure.
The closing plate should be tested for adjustment at this point, using the fixation bolts
to hold the plate in place, raise and lower the unit a few times.
IMPORTANT : To prevent marine growth inside the casing, it is essential that once
the unit is raised, no light is allowed to enter the turbine enclosure. Therefore the
closing plate gasket is essential and requires careful and permanent fixation.
NOTE : Never use antifouling or other paints on the RETRACT unit.
- 6 INSTALLATION MANUAL RETRACT R 450
