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UWSH Study Guide > Propellers > Flashcards

Propellers Flashcards

1
Q

What are the three types of propellers

A

Monoblock, Built Up, CPP

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2
Q

Difference between CPP and Built up?

A

CPP Blades can adjust position to full ahead or full stern without the shaft losing or gaining speed

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3
Q

2 types of cpp bolts, how do you remove both?

A

Hytorq- Intensifier hooks up to the power heada which is attached to the hytorq wrench

Moregrip- Intensifier hooks up to power head which is attached to the bullet

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4
Q

Number of CPP bolts and order removed?

A

8 - 2,6,3,7,1,5,4,8

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5
Q

What are the soft good change out on the Cpp blade change out?

A

Prarie air nipple, center post sleeve cover, port seal cover, chesterton seal

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6
Q

How are the blades numbered on cpp and monoblock

A

Mono- as the blade passes through the lifting eye
cpp- the blade stamp on the blade palm

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7
Q

How do you measure the roughness of the blade? what is the min passing?

A

Rupert Scale/B

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8
Q

What are 3 ways to remove the prop

A

explosives, charleston gear, pilgrim nut

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9
Q

Explain Charleston Gear?

A

A hydraulic Ram assembly that pushes against the strong back seated on the prop, unseating the propeller.

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10
Q

What is the measurement for explosives and what type of explosive?

A

Det Cord every 1 inch

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11
Q

When can you use explosives?

A

When given permission by NAVSEA 00C5

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12
Q

What do you use to replace the preservatives in a dunce cap and hub?

A

Cosmoline, Tectile

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13
Q

What do you use to prevent hydrolock for bolts in cpp blade change out?

A

Cherry juice, hydro lube

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14
Q

Where is the hub stamp located and the information on it?

A

Around the lifting eye by blades 1 and 2

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15
Q

What are the 3 types of props on a 688?

A

Conventional, Hybrid (banded) , Mod25

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16
Q

What are the types of props on a 774?

A

Propullsor (Shrouded)

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17
Q

What do you do to a sub prop before taking it out of the water?

A

Cover the prop

18
Q

How far from the blade tip should you clean?

A

3 in.

19
Q

2 types of hytorq bolts?

A

Hex head and star pattern

20
Q

Where is the blade info found for a cpp blade?

A

blade palm

21
Q

How many temp bolts are used in a CPP job to guide the blade back in?

A

4 temp bolt

22
Q

What chain hoist do you use in CPP blade change out?

A

3 ton 30ft and 10ft throw

23
Q

Explain Moregrip bolts?

A

The Morgrip Bolt bolt contains a bored cavity which allows the threads to stretch during installation.

24
Q

What chapter is propellers?

A

3

25
Q

What chapter is cpp blades?

A

12

26
Q

For CPP removal what position should the ship and blade be in to remove blade?

A

12oclock full ahead, less than 1 degree list

27
Q

How many props does a carrier have? And what are they?How many props does a carrier have? And what are they?

A

4 mono

28
Q

How are they numbered?

A

port to starboard, 1,2,3,4

29
Q

Measurements for A frame on a CPP blade?

A

55 inches from tip of blade, 17 inches from blade palm, and 20 inches from blade palm

30
Q

Name parts of the CPP blade?

A

Perrier air nipple, parrier air holes, blade palm, dowel pins, suction, pressure face, leading and trailing edge

31
Q

What is the purpose of the prairie air holes?

A

To tamper with the noise of the ship.

32
Q

What is the purpose of the prairie air check valve?

A

To keep water from entering the air channels

33
Q
  1. 2 Ways to remove a propeller with a crane?
A

Yard and stay and balance beam

34
Q
  1. How much should a pilgrim nut protrude to loosen the nut off the prop? What is the max PSI?
A

3/8”, 4 PSI

35
Q
  1. What is the position you take out the soft goods on a CPP blade changeout?
A

6 oclock

36
Q

What is the tire called in the pilgrim nut?

A

Nitrile tire

37
Q
  1. How do you know the pilgrim nut has unseated the shaft?
A

The pressure dial will drop to 0 and a big whoosh in the water from divers’ perspective

38
Q
  1. What PSI should a dunce cap hold when flushing it and for how long? Why?
A

10 PSI for 10 min to check for leaks

39
Q
  1. The use of a dial indicator?
A

Wrapped around the shaft where the rope guard was, touching the prop. Tells you when to stop seating the prop with the pilgrim nut

40
Q

What mechanical practice should be performed on dowel pins and bolts for cpp blade?

A

Freeze dowel pins to make it easier to install, one bolt at a time in a separate plastic bag

41
Q
  1. Parts of a blade?
A

Blade fillet, Blade tip, Suction and pressure face, emitter holes, hub, dunce cap, Trailing and leading edge

UWSH Study Guide (7 decks)

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