Clear dope produces the most tension and strength.

Question

BlackTom AI · Accepted Answer

Cellulose-based dope coatings (nitrate or butyrate) shrink as the solvent evaporates; that shrinkage is what tightens fabric and increases its effective tension and load-carrying stiffness. Clear (unpigmented) dope allows the maximum film-forming polymer content to contract uniformly without interference from suspended pigments, so it typically produces greater shrinkage — and therefore more surface tension and resultant strength — than heavily pigmented formulations.

Relevant knowledge points:
- Dope = cellulose lacquer used to seal, stiffen, and tighten fabric coverings (common in model and vintage aircraft).
- Shrinkage on drying is the mechanism that creates tension in the fabric.
- Nitrate dope shrinks more than butyrate, and clear (unpigmented) versions generally exhibit more shrinkage than pigmented variants because pigments reduce the relative polymer content and interrupt uniform film contraction.

Step-by-step reasoning:
1. Apply clear dope to fabric: solvent evaporates and polymer chains draw together.
2. Film contraction (shrinkage) pulls on the fabric substrate, increasing tension and tightening the covering.
3. Greater shrinkage produces higher in-plane tensile stress in the fabric, improving stiffness and load distribution (per unit area) — perceived as increased strength of the covering system.
4. Pigments or fillers interfere with polymer chain mobility and reduce net shrinkage, so pigmented dopes create less tension.

No numerical calculation is required here; the reasoning is qualitative and based on material behavior. The statement is correct because clear, high-shrinkage formulations deliver the largest net contraction and thus the most tension/strength in the finished fabric covering.

Why “False” would be incorrect: claiming clear dope does not produce the most tension would ignore the role of pigments and fillers in reducing shrinkage and tension. Therefore the correct answer is True, matching the provided answer.

Clear dope produces the most tension and strength.判断题

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