4
With the vessel out of water, drill a hole of 42mm diameter
through the hull to take the paddle housing and use
conventional methods for sealing. It is advisable to avoid the use
of mastic materials - use a form of proprietary silicon sealant.
Figure 2 - Paddle Housing Installation (Sectioned view)
The securing nut has a groove on its underside which should
also be filled with sealing compound. Take care not to over
tighten this nut. After the sealing compound has set, wipe off
the excess and encapsulate the whole assembly in G.R.P. As
shown on Figure 2. Take care to ensure that a minimum of
20mm of thread is clear at the top of the paddle housing.
The paddle wheel unit can now be slid into the housing so that it
is exposed to the water flow, with the arrow pointing forward
along the centre line of the vessel. It is recommended that a little
silicon grease is smeared over the rubber O-ring to keep the unit
free. Tighten the retaining nut onto the top of the housing, and
plug the cable into the ‘paddlewheel’ socket on the display. For
added protection it is again recommended that the plug is lightly
covered with silicon grease.
HULL
20mm
MINIMUM
SECURING
NUT
SILICONE
SEALANT
Housing
G.R.P.
42mm
Hole for paddle wheel unit
NOT TO SCALE