(2024 Exam) UWSH Ch 3Propellers Flashcards
Section 3 Planning and Prep & Section 6 Rigging the Prop.
Planners must extensively research the individual ship’s ____ b/c they may need to consult several drawings to obtain the required info. Where can the ____ be found?
SDI (Ships Drawing Index)
It may be found in the ships log room.
What NSTM CH covers propellers?
NSTM CH 245
What must be accomplished prior to a propeller replacement?
A VTI (Visual Technical Inspection) must be done.
What form of VTI’s recorded on?
NAVSEA form 9245/3
Any ready for issue (RFI) propeller must have a NAVSEA form ______ and what is the form?
NAVSEA form 9245/1
Propeller and Propulsor Major Sub Assembly Certification.
The shaft taper must never be left exposed for more than _____?
Three days.
The ship should have a minimum water depth at the stern of at least _____ greater than the ship’s draft?
10 feet.
What are the two methods for removing, lifting and installing Props?
Balance beam
Yard and Stay
What is required onsite when using U/W hydraulic chain hoist?
NAVSEA representatives to prevent the overloading the hoist.
What type and size of wire rope is most commonly used in U/W work?
Bright (uncoated) 6X19 (6 strands X 19 wires per strand)
What safety factor is used in design calculations?
Safety factor of 5.
How much is wire ropes breaking strength reduced at an angle of 45degrees?
30 %
