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

half the required lace spacing for the rest of the rib
two times the required lace spacing for the rest of the rib
the same as the rest of the rib.

Question

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

half the required lace spacing for the rest of the rib
two times the required lace spacing for the rest of the rib
the same as the rest of the rib.

BlackTom AI · Accepted Answer

Uniform, symmetrical spacing requires the first lacing stitch at half the regular spacing so the subsequent stitches fall on the standard pitch and the end gaps are even.

1) Relevant knowledge points and concepts
- Lacing fabric to a wing rib uses a regular pitch (spacing) between stitches to distribute load and ensure a neat, aerodynamic surface.  
- To avoid a large or unequal gap at the leading edge, the first stitch is offset by half the regular spacing so the sequence of full spacings centers properly along the rib.

2) Step-by-step reasoning
- Let S be the required lace spacing for the rest of the rib (the regular pitch).
- If the first stitch from the leading edge is placed at S/2, then the next stitch is at S/2 + S = 3S/2, the following at 5S/2, and so on. The difference between successive stitches is S (the required spacing).
- This pattern leaves an S/2 gap at the very leading edge and, if the rib length is an integer multiple of S, an S/2 gap at the far end, producing symmetric end gaps.

3) Calculation example (all intermediate steps)
- Example: required spacing S = 2 in; rib row positions measured from leading edge:
  - First stitch: S/2 = 1 in
  - Second stitch: 1 + 2 = 3 in
  - Third: 3 + 2 = 5 in
  - Fourth: 7 in, etc.
- Differences between stitches: 3 − 1 = 2 in, 5 − 3 = 2 in, etc., so the regular 2 in spacing is preserved and the leading edge gap is 1 in (S/2), symmetric with the trailing end if the rib length permits.

4) Why the correct answer is correct
- Using S/2 at the first stitch centers the regular spacing pattern relative to the rib ends, avoids uneven large gaps at the leading edge, and ensures uniform load distribution and appearance.

5) Why the other options are incorrect
- “Two times the required lace spacing” would create an excessively large initial gap, breaking uniform spacing and causing uneven tension.  
- “The same as the rest of the rib” (i.e., first stitch at S) would result in an uneven end condition, often leaving a larger or irregular gap at the leading edge rather than centering the pattern.

6) Conclusion
- Therefore, the first stitch should be placed at half the required lace spacing for the rest of the rib, matching the provided correct answer: half the required lace spacing for the rest of the rib.

When lacing fabric to a wing rib, what is the spacing for the first stitch? (Note: the first stitch is considered from the leading edge.) half the required lace spacing for the rest of the rib two times the required lace spacing for the rest of the rib the same as the rest of the rib.单项选择题

类似问题

After rib lacing is complete, finishing tape is placed over the rib lacing prior to the next coat of dope.

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What is one requirement for using fabric to cover an aircraft?

When covering an aircraft with a Standard Airworthiness Certificate and Ceconite® polyester fabric, following which requirements is mandatory?

After rib lacing is complete, finishing tape is placed over the rib lacing prior to the next coat of dope.

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