Which statement is true

Question

BlackTom AI · Accepted Answer

Lace spacing is determined by the aircraft velocity never exceed (VNE).

Relevant knowledge points: "Lace spacing" here refers to the spacing of lacing wires, stitching, or attachment points on fabric-covered control surfaces or skin panels. These attachment spacings control panel stiffness, mass distribution, and the tendency of the fabric or panel to flutter. Aerodynamic flutter and panel vibration depend on dynamic pressure (proportional to the square of airspeed) and structural stiffness; designers therefore size attachment spacing so the critical flutter or oscillation speed is above the certificated never-exceed speed (VNE) plus safety margin.

Step-by-step reasoning:
1. Aerodynamic forcing on a fabric panel increases with dynamic pressure q = 1/2 ρ V^2. As V increases toward VNE, aerodynamic loads that can excite panel vibrations rise rapidly.
2. The onset of panel flutter or unstable oscillation is determined by the panel’s mass, stiffness, and boundary conditions (including spacing of lacing/attachments). Larger spacing reduces effective stiffness and lowers the flutter speed.
3. To ensure safety, designers choose a lace spacing that gives a critical flutter or vibration speed well above VNE. Thus lace spacing is set with reference to the maximum allowable aircraft velocity.
4. Wing width (chord or overall width) influences geometry but is not the primary controlling factor for lace/lacing spacing; it may influence the number of laces required but not the spacing criterion driven by flutter speed.

Why the other option is incorrect: "Lace spacing is determined by the width of the wing" is incomplete/misleading. Wing width might constrain how many laces fit, but it does not determine the safe spacing criterion—the governing requirement is structural/aeroelastic behavior at the aircraft’s maximum speed (VNE).

Conclusion: For aeroelastic safety, lace spacing is chosen to keep critical vibration/flutter speeds above VNE; therefore the correct statement is the one about VNE, matching the provided answer.

Which statement is true单项选择题

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