What determines the spacing of rib lacing stitches on a fabric covered wing?

the type of polyester
the type of glue
the never exceed speed of the aircraft

Question

What determines the spacing of rib lacing stitches on a fabric covered wing?

the type of polyester
the type of glue
the never exceed speed of the aircraft

BlackTom AI · Accepted Answer

Rib lacing stitch spacing is governed by the aerodynamic loads corresponding to the aircraft’s never-exceed speed (Vne) because spacing must ensure the fabric can carry the peak aerodynamic forces without tearing or producing flutter.

1) Relevant knowledge points and concepts
- Dynamic pressure q = 1/2 ρ V^2 determines aerodynamic load per unit area; higher V produces much larger loads.
- Rib lacing stitches transfer fabric loads to structure at discrete points; stitch spacing must be chosen so each stitch (or group of stitches) does not exceed allowable load for the thread and fabric.
- Material choices (polyester type, adhesive) affect durability and attachment method but do not set the maximum aerodynamic loads used to size stitch spacing.

2) Step-by-step reasoning
- The worst-case design load on the fabric occurs at or near Vne. Therefore designers compute dynamic pressure at Vne and use that to find the tensile load on a fabric panel between ribs. The stitch spacing is then chosen so that the load per stitch is below the allowable strength (including safety factors).

3) Intermediate/calculation example
- Dynamic pressure q = 0.5 × ρ × V^2. At sea level, ρ ≈ 1.225 kg/m^3.
- Example: Vne = 200 kt ≈ 102.9 m/s → q = 0.5 × 1.225 × (102.9)^2 ≈ 6,485 Pa (N/m^2) ≈ 0.94 psi.
- If a fabric panel between ribs has area A per unit length, the load = q × A. Required stitch strength = load / number_of_stitches × safety_factor. Spacing is set so each stitch meets this required strength.

4) Why the correct answer is correct
- Since stitch spacing is sized to resist the peak aerodynamic loads, and those loads scale with V^2, Vne (the maximum allowable speed) is the controlling parameter for spacing design.

5) Why the other options are incorrect
- The type of polyester affects fabric properties (shrinkage, UV resistance, heat-shrink behavior) but does not determine spacing required to carry aerodynamic loads. 
- The type of glue affects how the fabric is bonded to structure but not the discrete spacing of lacing stitches needed to carry aerodynamic loads between ribs.

6) Conclusion
- Therefore the spacing of rib lacing stitches is determined by the never exceed speed of the aircraft (Vne), which matches the provided correct answer.

What determines the spacing of rib lacing stitches on a fabric covered wing? the type of polyester the type of glue the never exceed speed of the aircraft单项选择题

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