Marlinspike Seamanship Flashcards
What are the large fiber ropes used by the Navy for working operations made of?
Manila, nylon, polyester ( Dacron), polypropylene and aramid (kevlar). Other small cordage used for seizing and lashing consists of sisal, cotton, jute and hemp
How are natural fiber ropes readily distinguishable from the synthetic ropes?
By their drier, harsher feel and their shorter fiber length (24 to 36 inches)
How are large fiber ropes identified?
By a water resistant marker inserted into the center of one strand of the rope
How can you differentiate between manila and sisal?
Remove and observe a few fibers from a strand center, Manila fibers will be a light yellow to cream color, with occasional reddish brown tones, whereas sisal will be a lustrous white.
How can you differentiate between nylon and polyester fibers?
Nylon and are white. Test burn a sample of each unidentified fiber, a slow burning blue flame is indicative of nylon, and a fast burning yellow flame indicates polyester.
What size of Navy used fiber ropes are required to be right laid ropes?
All Navy large laid ropes 1-3/4 inch in circumference or larger
Hoar are plain-laid ropes normally constructed?
Three strands twisted in an alternate patter
How is four strand aramid fiber rope constructed?
It is constructed of parallel yarns in each strand, left laid helically around a strand core. The four parallel laid strands are twisted together in the opposite direction around a center core.
What constitutes cable-laid ropes?
Three right plain-laid ropes twisted together in the opposite direction. The final turn in the cable-laid rope is always to the left.
What is the construction of plaited ropes?
The construction is similar to 3 stand synthetic plain-laid rope, except there are four right (z) and four left (s) twist strands. These strands are plaited together in pairs, two parallel strands of left turn going to the right and two parallel stands of right turn going to the left.
