Re: [Amel Yacht Owners] Solar Panel Location
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The arch attaches to the deck through "mortise and tenon" type fittings. The small amount of side to side movement doesn't stress the fitting that is bolted to the deck.
With those tall arches and the tendency for sway I would be concerned about the stress on the fiberglass where the mountings are attached. That sway would translate into considerable lever action on the mounting points. Over time watch for star fracturing of the gel coat.
SM 299 Ocean Pearl