MAX POWER
INSTALLATION OF THE RETRACT UNIT
CONSTRUCTION OF THE MOUNTING BASE
MAX POWER can supply as an option, a G.R.P. laminated mounting base, or an
aluminium machined mounting-flange. These options allow you to save considerable
installation time, and assure precise installation.
The general method and materials used must be adapted to the particular hull
material (laminated wood, GRP, sandwich, aluminium, or steel). Naval Architects,
Classification Societies or engineering firms should be consulted.
The thruster’s mechanical stresses are spread over the hull by the mounting base.
Installation, which should be executed by welding or bonding to the hulls plating,
normally reinforces the hull, The mounting base may be attached to frames and
stringers as well.
After the mounting base has been made and fitted the RETRACT should be
temporarily secured on the flange to check its height its, centring, the accessibility of
fittings and the ease of operation for manual override system.
GRP HULLS
The mounting base may be moulded into the hull during construction or
prefabricated, and then laminated onto the hull later.
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 (or 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 10 mm
studs or tapped holes.
CONSTRUCTION OF HULL OPENING & CLOSING PLATE
The required hull opening dimensions are L = 350 mm x W = 260 mm.
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 27 mm to the rear with
respect to the transversal centre line of the mounting flange.
The opening is closed by a plate which may be made from the cut-out hull section, or
specially fabricated.
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INSTALLATION MANUAL RETRACT R 300
