18. The Bilge Stringer Joinery and Through Hull Fittings. Wooden Boat Restoration.
Channel: SV Andromeda
Date: 2019-02-12

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In this episode we glue back together one of the scarf joins that was cut into the port side stringer when it was removed in Episode 8. I measured this at a ratio of 12-1 which is very generous for a scarf join under that particular type of load. I have heard that beams and capping pieces that are fastened in several places should be 8-1 and spars that are unsupported in places should be at least 12-1. So I'm confident of the engineering in this joint. This means that I measured the width of the stringer, multiplied it by 12 and used that as the length for the cut in the scarf join, increasing the glued surface area drastically, over a butt joint that would not have worked at all.

We mix up thickened epoxy from West System to glue this back together and support the join with eight mechanical fastenings (silica bronze 2 inch size 12 screws). This should ensure the stringer is as strong as it's original state.

In addition we remove the 4 remaining skin fittings that I couldn't get off the hull very easily. I want to re-bed these down once I've cleaned up the woodwork to ensure a watertight fit in my mission to make Andromeda's hull as watertight as possible. The nuts for these fittings are a mixture of 27mm 30mm and 31mm or the imperial equivalent so it was very tricky to get them off, after 50 years of saltwater ingress and very little grease.

Music:
Broke For Free - A Beautiful Life
Broke For Free - Night Owl
Blank & Kytt - RSPN

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