Boatswain's Mate First Class (BM1) Complete Practice Test 2026

The correct answer is four strand aramid fiber rope. This type of rope is known for its high strength-to-weight ratio, low stretch characteristics, and consistency in performance under load. At minimum breaking strength, four strand aramid fiber rope stretches only about 6 percent, making it ideal for applications where minimal elongation is critical, such as in towing or lifting operations.

Aramid fibers are also resistant to abrasion and have high tensile strength, which contributes to their effectiveness and safety in various marine environments. This capability allows for secure and reliable performance, minimizing the risk of sudden recoiling that can happen with more elastic ropes.

In contrast, polyester fiber and three strand nylon ropes generally have higher stretch percentages than aramid fiber, making them less suitable for applications where minimal elongation is required. Manila rope, being a natural fiber, also tends to have a greater stretch and is typically used in situations where the specific advantages of synthetic fibers are not necessary.