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When actually leaking enough to cause rot, they look more like this.
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This shows the flotation foam behind the starboard panel. I intend to reuse most of it, but fastened into place with spray foam. When loose, they act as wedges against the panels and may have contributed to the pop rivet failures.
CD 16 seat box/cockpit panels removed.
Seat box removal, showing the exploratory drilling on the port side that made me decide to remove everything. The dark holes indicate bad balsa core. The outer holes are marked "OK" with a red marker, although I may find that's a bit hopeful when I go further.
When actually leaking enough to cause rot, they look more like this.
These rivets all have rusty mandrels, indicating high levels of moisture in the core even areas where the rivets didn't appear to have leaked and the wood appears okay.
Even the rivets that looked good simply fell apart when bumped or drilled. These are aluminum rivets with a steel mandrel. Not a problem if they never get wet. Oh that's right, it's a boat!
Exploratory drilling showed stained but essentially good wood near the helm seat box pop rivets. I'm amazed, given what I found on the other side and the fact that these two rivet heads had fallen off.
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When actually leaking enough to cause rot, they look more like this.

When actually leaking enough to cause rot, they look more like this.
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Balsa Core Issues
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On the original setup, the fuel filter was between the tanks and screwed to the deck. It's now hung temporarily from an outboard bolt (above the bilge pump) and exploratory holes have been drilled to find out the condition of the balsa core where it has been breached to install hold-downs for the various gear.
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Marco Flamingo
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