{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

quiz1 - Massachusetts Institute of Technology DEPARTMENT OF...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Massachusetts Institute of Technology DEPARTMENT OF MECHANICAL ENGINEERING Center of Ocean Engineering 2.611 SHIP POWER and PROPULSION Fall 2006, Quiz 1 1) (20 pts) a) Discuss how Controllable Reversible Pitch (CRP) propellers can help prevent engine overloading. Consider your answer in terms of Torque (Q), angle of attack ( α ), Lift, Drag, Velocity of Advance (J), Pitch, and shaft speed. (The use of all terms is not necessary as long as a logical sound argument is made.) (10pts) b) Discuss the cause of u a and u t . V A ω r+V T V * u a * -u t * V o B i B G 2) (50 pts) A ship captain must purchase a new propeller to replace the damaged one currently installed on his ship. The supplier only has two propellers in stock. Both are fixed pitch, 5 blade Wageningen B-series propeller with an EAR of .45, one has a pitch of 17.1 ft and the other a pitch of 20.9 ft. The details of the ship are as follows: Conversion factors Ship and Propeller characteristics: B-series 5-45 propeller (see attached sheet) knot 1.688 ft sec = Pitch 1 = 17.1 ft or Pitch 2 = 20.9 ft
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}