Tug Study Guide

Question 1

On a HP to HP basis - Vough Schneider system is less efficient at co
Getting HP into BP

Answer 1

True

Question 2

ASD Shortcomings

Answer 2

Less nimble than tractor tugs when moving laterally

They do not walk sideways as swiftly as a tractor

Question 3

Slip

Answer 3

Potential amount of power loss between propeller and vessel speed

Question 4

An open fixed pitch propeller will only give what percentage when going astern

Answer 4

60% of its thrust ahead

Question 5

Ducted props

Answer 5

Produce 15-60% more thrust than unducted props

Question 6

Bollard Pull

Answer 6

One long ton (2240 pounds) per 100 shp

Question 7

Bollard Pull Ranges

Answer 7

22.5 and 38 pounds per hp

Question 8

Open fixed propeller

Answer 8

60% astern power

Question 9

Ducted propellers

Answer 9

Produce 15-60% more thrust

Question 10

Todays nozzle

Answer 10

Can get 70% astern power

Question 11

CPP Astern

Answer 11

Only 40-45% astern power

Question 12

A ships hull resistance

Answer 12

Increases as the square of its speed

Question 13

If ASD is operating bow first

Answer 13

It shares same risk of fitting as a conventional tug

Question 14

3-4 knots

Answer 14

Max conventional tug pushing force