Bronze Bondshells - Sail Magazine

Bronze Bondshells

Jim Fischer of Ellicott City, Maryland, asks:"All the bronze seacocks aboard my 1979 fiberglass 34ft sloop are connected to a keelbolt, along with the boat's lightning ground system, which is also connected to a keelbolt. Is this still the recommended arrangement, or do you think all the seacocks should be isolated from each other and not connected to a keelbolt? Can I
Author:
Updated:
Original:

Jim Fischer of Ellicott City, Maryland, asks:

"All the bronze seacocks aboard my 1979 fiberglass 34ft sloop are connected to a keelbolt, along with the boat's lightning ground system, which is also connected to a keelbolt. Is this still the recommended arrangement, or do you think all the seacocks should be isolated from each other and not connected to a keelbolt? Can I assume that the lightning ground from the shrouds and mast should remain connected to the keelbolt?"

Nigel Calder replies:

Your question is a good one. Frankly, this is a thorny subject. From a lightning-protection point of view, it is generally accepted that the more underwater metal you connect together, the better. However, in my view the science on this point is not very strong. From the perspective of galvanic corrosion, on the other hand, it is clear that tying in those bronze through hulls will accelerate the zinc loss on your anodes. If the zinc gets used up, the bronze will start to prey on other metals, like your stainless steel propeller shaft.

If it were my boat, I would un-bond the through hulls, except the ones that are submerged in bilge water inside the boat. In those cases you should keep them bonded together because this can prevent another kind of corrosion - stray current corrosion - which can be even scarier than the accelerated zinc loss you might get by bonding the through hulls.

Related

PICTON CASTLE under sail with stunsls WV7 compressed

Picton Castle Seeks Crew

The Picton Castle is set to begin its eighth circumnavigation this spring under the command of Captain Daniel Moreland. A professional crew of 12 will guide up to 40 trainees at a time as they learn about all aspects of sailing the bark, from steering to lookout, ...read more

DSC_0013

Ask Sail: Keel Attachments

Q: I have an early ‘70s Catalina 27. The keel bolts look pretty good. My question is, why not glass over the keel to bond to the hull rather than changing the bolts if, or when the bolts are too far gone? I haven’t seen anything on this, so could you discuss? Full-keels are ...read more

04-GOPR0511

Book Review: Sailing Into Oblivion

Sailing Into Oblivion by Jerome Rand $15.99, available through Amazon As refreshing and inspiring as Jerome Rand’s 2017-18 solo-circumnavigation may have been, his account of the voyage in the book Sailing Into Oblivion: The Solo Non-Stop Voyage of the Mighty Sparrow may be even ...read more

01-1970-Dec

50 Years of SAIL

Back in early 1970, Bernie Goldhirsh and the recently founded “Institute for the Advancement of Sailing,” publisher of an annual sailboat and gear guide, launched something called SAIL. A half-century later, a look back at the magazine’s first few years provides a glimpse into a ...read more

Photo-by-Adobe-Stockpics721-2048x

Webinar: Navigating Post-Dorian Abaco

On Thursday, October 22 at 6 pm ET, Navigare Yachting presents a webinar on what to expect from Abaco post-Dorian. The event will feature the authors of The Cruising Guide to Abaco, Steve Dodge and his sons Jon and Jeff.Hurricane Dorian hit Abaco in early September of 2019 and ...read more

LunaRossaBoat2

Luna Rossa Prada Pirelli Christens “Boat 2”

Hot on the heels of the UK’s Britannia and the United States’ Patriot, Italy’s new AC75 Luna Rossa, formerly known as Boat 2, was christened in Auckland, New Zealand, this morning. As the moniker suggests, it was Team Luna Rossa Prada Pirelli’s second design. In his christening ...read more

m7803_DSCF6698-1

Challengers Christen Britannia and Patriot

October 16 proved an exciting day for America’s Cup fans with the christening of both the UK’s Britannia and America’s Patriot. Britannia will be helmed by four-time Olympic gold medalist and America’s Cup winner Sir Ben Ainslie. Olympic Gold medalist Giles Scott will serve as ...read more

HookPromo

Defender Product Spotlight: Lowrance Hook Reveal

Defender product expert Alex Lyons explains the benefits of HOOK Reveal’s new FishReveal technology: “DownScan sonar uses high frequencies to provide a picture-like image of the sea floor. The traditional sonar’s lower frequencies are best suited for locating fish in the water ...read more