Propellers Flashcards by stetson carlile

What are the three types of propellers

Monoblock, Built Up, CPP

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Difference between CPP and Built up?

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

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

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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Number of CPP bolts and order removed?

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

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

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

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How are the blades numbered on cpp and monoblock

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

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

Rupert Scale/B

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What are 3 ways to remove the prop

explosives, charleston gear, pilgrim nut

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Explain Charleston Gear?

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

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

Det Cord every 1 inch

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When can you use explosives?

When given permission by NAVSEA 00C5

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

Cosmoline, Tectile

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

Cherry juice, hydro lube

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

Around the lifting eye by blades 1 and 2

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What are the 3 types of props on a 688?

Conventional, Hybrid (banded) , Mod25

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What are the types of props on a 774?

Propullsor (Shrouded)

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

Cover the prop

How far from the blade tip should you clean?

3 in.

2 types of hytorq bolts?

Hex head and star pattern

Where is the blade info found for a cpp blade?

blade palm

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

4 temp bolt

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

3 ton 30ft and 10ft throw

Explain Moregrip bolts?

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

What chapter is propellers?

What chapter is cpp blades?

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

12oclock full ahead, less than 1 degree list

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

4 mono

How are they numbered?

port to starboard, 1,2,3,4

Measurements for A frame on a CPP blade?

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

Name parts of the CPP blade?

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

What is the purpose of the prairie air holes?

To tamper with the noise of the ship.

What is the purpose of the prairie air check valve?

To keep water from entering the air channels

33. 2 Ways to remove a propeller with a crane?

Yard and stay and balance beam

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

3/8”, 4 PSI

36. What is the position you take out the soft goods on a CPP blade changeout?

6 oclock

What is the tire called in the pilgrim nut?

Nitrile tire

38. How do you know the pilgrim nut has unseated the shaft?

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

39. What PSI should a dunce cap hold when flushing it and for how long? Why?

10 PSI for 10 min to check for leaks

40. The use of a dial indicator?

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

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

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

45. Parts of a blade?

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