Monday, March 16, 2020

Scarphing? Tick

I've just laid up my second scarph. The next step will be a dry run at a 3D Paradox.
The eagle-eyed reader will note that the bow sections are not properly formed on the bow plates. Two reasons, one that I'm thinking about forming a bluff or square bow and that sheets of ply on Australia are metric, so 40mm of so short. NB AUSTRALIAN BUILDERS: the stern plate does not use the full 2400mm sheet, so back adding length there you could still achieve the designed length.

Me: "What's a few mill?".

PS: The starboard scarph gave way during the dry fit. Cracked open all the way along.  At the time I thought a) I'd stressed it to much during assembly,  or b) the resin was too old. 
This week I bought a new Bore Cote epoxy kit and after sanding off most of the old resin,  replied the starboard scarph. This morning though,  I was less than impressed with the result.  The epoxy has not dried hard, it's more like a hard gel , and it's milky in colour.  I do know the BC epoxy is water clean up ,  and both times the scarph was glued in unsettled weather conditions and covered while setting to keep them dry.  It's possible that small amounts of moisture,  or the high humidity,  has caused the epoxy to spoil. If this is the case,  I won't be buying Bite Cote again.
On a positive note,  reading Oughtreds book on boats building he recommends tapping scarph joins.  Tick.

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