Propulsion Systems - Shiphandling Facts and Rules

Question 1

Propulsion Systems - CPP pitch reductions (Rowe)

Answer 1

large sudden reductions in pitch or going to zero pitch can disrupt steering ability (Rowe pg 107)

Question 2

Propulsion Systems - CPP astern power

Answer 2

• less than conventional propeller
• 40-45% of max ahead thrust when going astern

Question 3

Propulsion Systems - CPP turns

Answer 3

• propeller continues to turn when engaged and at zero pitch
• keep lines clear of CPP

Question 4

Propulsion Systems - CPP “Combinator” (Rowe)

Answer 4

automatically balances RPM and pitch (Rowe pg 106)

Question 5

Propulsion Systems - CPP creep (Rowe)

Answer 5

beware of creep ahead or astern when control is set to zero pitch (Rowe pg 109)

Question 6

Propulsion Systems - CPP direction of rotation

Answer 6

• all CPP turn same direction when going ahead and astern
• often are right-hand propellers which therefore turn clockwise when going astern
  -handle like a conventional left-hand propeller astern when docking