MJ Sailingvideo
Lifting Our 7,000 lb Catamaran By Ourselves!! - Changing Our Base to Foam (MJ Sailing - Ep 285)
May 20, 2023 · 23 min · 61K views
What this video covers
To support a catamaran hull during a long-term refit, the crew replaces temporary plywood and jack supports with four high-density foam blocks.3:55 The team selects 1.35-pound density foam, a material commonly used in boatyards and recommended by Gunboat 48 owners to cradle hulls and distribute weight across a wider surface area.4:03 To maintain the boat's precise level, the crew uses a laser level to mark reference points on the hull, ensuring the vessel remains in the same position as when the interior bulkheads were installed.5:13 They construct a foundation for the foam using cinder blocks, paving stones, and countertop scraps.13:00 After positioning the blocks, the crew spends several days making iterative adjustments—swapping plywood shims and shaving the foam—to account for the settling of the crushed stone base.11:17 Despite initial fluctuations in height, the team achieves a uniform support level within one-eighth of an inch across all four points.22:27
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