Sven Yrvindvideo
Bending the Bottom a Bit.
October 8, 2026 · 8 min · 4K views
What this video covers
Sven Yrvind modifies the hull shape of his boat by adding a 24-millimeter rocker to the bottom curve.1:32 He secures metal angles to the floor and inserts spacers to create an even, deeper curve toward the stem.Watch The rocker depth varies from 5 millimeters to 25 millimeters across the structure, with spacing intervals adjusted between 60 centimeters and 88 centimeters to achieve the desired hull profile.3:55 To ensure structural alignment, he uses a 3-4-5 triangle method—the Egyptian triangle—to establish a precise 90-degree angle for the frame.5:52 He calculates the triangle sides at 89 centimeters, 118.7 centimeters, and 148.3 centimeters to square the layout.6:04 After securing the components with bolts and weights, he runs a string line across the center of the molds to maintain a consistent centerline for the hull construction.7:38
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