What is backstitch and why is it used on parachute seams?

What is backstitch and why is it used on parachute seams?

• A. A decorative stitch used to color-match.
• B. A stitching back-over-action that locks the thread end to prevent unraveling.
• C. A stitch that weakens the seam.
• D. A stitch used to vent air.

Answer: (B)

Backstitch is a stitching technique where you stitch forward and then reverse over the same stitches at the end to lock the thread ends. This creates a secure lock that prevents the thread from unraveling if a stitch pulls out or the seam is under load. On parachute seams, the fabric and stitching endure high tension, acceleration, and movement during use, so a locked end is essential to keep the seam intact and avoid failure. Decorative stitching would not provide the required strength, and any stitch described as weakening the seam or used for venting air wouldn’t give the necessary secure finish.

Backstitch is a stitching technique where you stitch forward and then reverse over the same stitches at the end to lock the thread ends. This creates a secure lock that prevents the thread from unraveling if a stitch pulls out or the seam is under load. On parachute seams, the fabric and stitching endure high tension, acceleration, and movement during use, so a locked end is essential to keep the seam intact and avoid failure. Decorative stitching would not provide the required strength, and any stitch described as weakening the seam or used for venting air wouldn’t give the necessary secure finish.