When lacing fabric to a wing rib, what is the spacing for the first stitch? (Note: the first stitch is measured from the leading edge fairing.)

Question

BlackTom AI · Accepted Answer

The first lacing stitch is placed at half the regular lace spacing measured from the leading edge fairing to provide closer reinforcement and proper fabric seating at the edge.

1. Relevant knowledge points and concepts
- Fabric covering of wing ribs uses evenly spaced lacing stitches to secure the fabric.
- The first stitch near a leading edge fairing needs closer spacing to prevent gaps, bunching, or excessive stress on the fabric/fairing interface.
- “Spacing” here means the distance from the leading edge fairing to the first stitch, and subsequent stitches are at the regular lace spacing.

2. Complete reasoning process step by step
- The normal (regular) lace spacing is the interval used between successive stitches along the rib.
- The area adjacent to the leading edge fairing experiences more handling, edge distortion risk, and potential for gaps if the first stitch is too far out.
- Reducing the distance of the first stitch concentrates the securing action right at the edge so the fabric sits smoothly over the fairing before being spaced normally down the rib.

3. Calculations / intermediate steps (example)
- If the required lace spacing for the rest of the rib is 2 inches:
  - Half of the required spacing = 2 in ÷ 2 = 1 in.
  - So the first stitch is placed 1 inch from the leading edge fairing, then subsequent stitches at 2-inch intervals.
- For a 3-inch standard spacing:
  - First stitch = 3 in ÷ 2 = 1.5 in from the fairing, then 3 in between later stitches.

4. Why the correct answer is correct
- Half-spacing for the first stitch places the fabric under proper tension at the fairing edge, prevents puckering or gaps, and transitions smoothly to the regular spacing. This is standard practice in fabric lacing to ensure a neat, secure edge.

5. Why the other options are incorrect
- Two times the required spacing would place the first stitch too far from the fairing, creating a loose edge and potential for fabric lift or damage.
- The same spacing as the rest of the rib does not provide the extra edge reinforcement needed and can permit gaps or uneven seating at the fairing.

6. Conclusion / confirmation
- Therefore, the correct choice is: half the required lace spacing for the rest of the rib, which matches the provided answer.

When lacing fabric to a wing rib, what is the spacing for the first stitch? (Note: the first stitch is measured from the leading edge fairing.) 单项选择题

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