Which patch is used for a jagged hole?

Which patch is used for a jagged hole?

• A. Box patch
• B. Soft pipe patch
• C. Duct tape patch
• D. Clamp patch

Answer: (A)

When patching a hull hole, the hole’s edge shape guides the patch method. Jagged edges are hard to seal cleanly unless you have a rigid surround that grips the surrounding sound metal. A box patch provides that structure: a box‑like frame around the hole creates a stable, stiff mounting surface for the patch material, distributing the load and forming a reliable seal even with irregular edges. It’s placed by fitting the frame around the hole, fastening it to solid metal, and then applying patch material and sealant inside the box to complete the watertight patch. Duct tape is a makeshift, temporary fix unsuitable for such openings; a soft patch works for smaller, smoother holes but not irregular ones; a clamp patch requires more regular edges and a clean clamping surface. The box patch is the best choice for jagged holes.

When patching a hull hole, the hole’s edge shape guides the patch method. Jagged edges are hard to seal cleanly unless you have a rigid surround that grips the surrounding sound metal. A box patch provides that structure: a box‑like frame around the hole creates a stable, stiff mounting surface for the patch material, distributing the load and forming a reliable seal even with irregular edges. It’s placed by fitting the frame around the hole, fastening it to solid metal, and then applying patch material and sealant inside the box to complete the watertight patch. Duct tape is a makeshift, temporary fix unsuitable for such openings; a soft patch works for smaller, smoother holes but not irregular ones; a clamp patch requires more regular edges and a clean clamping surface. The box patch is the best choice for jagged holes.