9
SE 50/140S ignition protected thruster assembly
version 1.0.0 - 2017
Tunnel installation
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Fig. 1
Fig. 3
Fig. 4
Fig. 2
EN
We recommend that a professional does the fibreglass fitting of the tunnel. These instructions are only general, and do not explain in any
way the details of fibreglass work. Problems caused by faulty installation of the tunnel, are the installers full responsibility.
Find the position in the boat considering the information given earlier in this manual and the applicable measurements for the thruster model you are
installing.
Mark the centre of the tunnel on both sides. Drill a 6mm hole horizontally in these marks (Fig. 1).
Bend a ø 5mm steel bar as shown with the “tip” bent back at the tunnel radius and mark the circle for the tunnel opening (outside diameter of the tun-
nel). Cut the hole with a jigsaw (Fig. 2).
Grind off the gelcoat and polyester so that you are down in the “real fibreglass” in an area of 12cm around the hole both inside and outside in the hull to
cast the tunnel to the hull (Fig. 3).
Insert the tunnel and mark its shape to fit the hull (Fig. 4). (if you are installing with a deflector/spoiler, leave a part or the tunnel of the front- and un
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derside of the tunnel to have a base for this (see page 20, Fig. 2). Cut the tunnel ends to the desired shape and lightly sand its surface and clean with
acetone or similar where you are going to apply fibreglass.
NB! Do not cast/glass on the area were the thruster will be placed.
Then cast the tunnel to the inside of the hull, use at least 8 layers of 300 g glass and resin, preferably alternating mat and rowing types of fibreglass
(see page 20, Fig. 1). If you are rounding the tunnel ends to the perfect 10% radius you may in some cases have to make further layers inside to pre
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serve the desired hull thickness.
NB! Make sure that any gap between the tunnel and the hull are completely filled with resin/fibreglass. In areas where you can not access to make
normal layers of resin/fibreglass, a resin/ fibreglass mixture must be filled in that area.
