Copyed from owner off 435 OVNI
In-Depth Discussion of Aluminum Boat Design & Selection, Part III|Offshore Sailboat Voyaging|Attainable Adventure Cruising
This was very useful when it came to wiring
up the new electronics
such as the autopilot
and the radar
, as after each item was fitted the leak test could be conducted to ensure that no fault existed as a result. All electronic units had to be isolated from the hull structure during installation
, once again to avoid any chance of leaks
to the boat's structure. We did, in fact, have a small problem during installation
, which was traced back to a faulty AIS
unit and rectified, so the leak meter is a vital component on this type of boat.
Another area which we approached with caution was the shore power
circuit. Having heard of (and seen) the effects of galvanic corrosion on boats kept in some marinas
, we were particularly aware that this was an area for concern for us. Not that we intend to base Pèlerin
in a marina, but who knows where we may decide to overwinter her at times. We finally opted to fit an isolation transformer, a device that is virtually unknown in Britain, at least, but by all accounts is common in the USA, and should be fitted to all metal boats, not just aluminum. Of course, we may never know just how effective the transformer is—if it’s working then we should see no problems, and I don’t suppose we shall turn it off to find out otherwise! It is a heavy and costly item, though, so we hope that it will prove its worth.
In keeping with our aim of avoiding drilling holes (and so giving corrosion a place to start) in the deck
, we are working out the best ways of attaching all mobile deck gear
, such as spinnaker
sheet and guy blocks, using simple Spectra (Dyneema) strops. So far we haven’t had to drill one additional hole in the deck, another step in keeping water
out of the boat at all costs. All fittings in stainless steel (such as stanchions) are isolated in plastic sockets to avoid corrosion, and all bolts are isolated with nylon washers, and liberal use of Tef-Gel to avoid seizures between dissimilar metals is essential to allow future maintenance.