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Fabricating the longeron and forward crossbeam for the 5083 aluminum expeditionary catamaran requires precise alignment to manage the structural loads of the forestay and anchor system.1:59 The longeron, a hollow structural member extending from the bridge deck, incorporates three chain plates for the jib, self-tacking jib, and downwind sails, while housing the anchor chain internally.1:11 During assembly, the crew encountered a 40-millimeter misalignment caused by incorrectly marked side plates, which they resolved by recalibrating measurements and using temporary bracing and a come-along to correct a twist.6:14 To prevent aluminum warping during welding, the team alternated sides and spaced out welds to distribute heat evenly.8:03 Final positioning involved using a laser level to ensure the structure was centered relative to the hull and bridge deck before tack welding.18:30 The project concluded with the installation of 32-millimeter thick chain plates and a Mantis Marine M2 anchor mount.22:02 Meticulous measurement and temporary structural bracing are essential for maintaining alignment when welding large, complex aluminum components.

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