quiz1 - Massachusetts Institute of Technology DEPARTMENT OF...

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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)
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This note was uploaded on 02/24/2012 for the course MECHANICAL 2.611 taught by Professor Davidburke during the Fall '06 term at MIT.

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quiz1 - Massachusetts Institute of Technology DEPARTMENT OF...

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