It is the inside that gives plywood magical strenght.

Name: It is the inside that gives plywood magical strenght.
Uploaded: 2026-03-30T22:00:00.000Z
Duration: 4 min 31 s
Description: Carbon fiber bonded to the inside face of 9mm plywood stops hammer penetration that outside lamination cannot.

March 30, 2026 · 4 min · 2K views

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What this video covers

Sven Yrvind demonstrates why carbon fiber laminated to the inside face of plywood produces far greater impact resistance than carbon applied to the outside. Striking a 9mm plywood panel reinforced on the outside with a hammer drives the carbon fiber straight through, causing catastrophic failure visible on the reverse face.▶ 1:11 Striking the same panel from the outside when carbon is on the inside produces only a small dent; the inner carbon layer spreads the impact forces outward at 45 degrees across a wide area, preventing penetration.▶ 2:01 The mechanism is force distribution over area and time: outside carbon concentrates the load at the point of impact and fractures immediately, while inside carbon intercepts the spreading stress cone and carries it across a much larger surface.▶ 2:29 Yrvind notes the fiber is polyester fiber, not glass fiber, and distinguishes this from carbon. The practical rule for amateur builders reinforcing plywood hulls: bond carbon fiber to the interior face, not the exterior.▶ 2:58