(2024 Exam) USN Towing Man Flashcards

Ch 4

1
Q

What is a Tow Hawser?

A

The tow hawser is the primary tension element of the towline system. Normally made up of wire rope or synthetic line.

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2
Q

For wire rope in new or very good condition and used in conjunction with an automatic towing machine, a minimum safety factor of ___ is appropriate for routine ocean tows in good weather?

A

minimum safety factor of 3.

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3
Q

To be on the conservative side and allow for unforeseen occurrences, a safety factor of ____ is recommended for routine tows?

A

4

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4
Q

Breaking strength for wet nylon line is about ____% less than for dry line?

A

15 %

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5
Q

What material is better suited for towing applications than Nylon?

A

Polyester

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6
Q

What do Fairleads do?

A

Fairleads are used to lead mooring lines around obstructions and align them properly with winches or capstans.

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7
Q

What type of shackles must never be used for connections in towing?

A

Screw-pin shackles.

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8
Q

What should replace cotter keys for shackles and other fittings in towing operations?

A

locking bolts with two jam nuts

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9
Q

Can you weld on forged steel shackles? How much does it reduce the strength?

A

No
By 30%

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10
Q

What three types of wire rope terminations are normally used in Navy towing applications?

A

Swaged, spliced and socketed.

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11
Q

Stoppers are nominally rated to hold a minimum of ____percent of the breaking strength of the chain or wire for which they have been designed.

A

60 percent

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12
Q

What do towing bows do?

A

keep the towline clear of all deck fittings and to furnish a protected area below the sweeping tow hawser where personnel can pass safely.

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13
Q

What is the purpose of horizontal stern rollers?

A

minimize chafing during heave-in and payout

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14
Q

What is the difference between capstans and gypsy heads?

A

Capstans rotate on a vertical shaft and Gypsy heads rotate on a horizontal shaft.

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15
Q

On the ARS 50 Class, the vertical stern rollers drop when the side force at mid-barrel height exceeds _______lbs?

A

50,000 pounds.

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16
Q

How efficient are wire rope clips?

A

80% efficient