Ship Handling and Design

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COURSE OBJECTIVES CHAPTER 9 9. 1. SHIP MANEUVERABILITY Be qualitatively familiar with the 3 broad requirements for ship maneuverability, namely. a. b. c. Controls fixed straightline stability Response Slow speed maneuverability 2. 3. 4. Qualitatively describe what each requirement is dependant upon. Briefly describe the various common types of rudder. Understand the various dimensions of the spade rudder, in particular a. b. c. d. e. Chord Span Rudder stock Root Tip 5. Qualitatively describe the meaning of: a. b. c. Unbalanced Rudder Balanced Rudder Semi-balanced rudder 6. 7. Qualitatively describe the sequence of events that causes a ship to turn. Qualitatively describe a rudder stall and understand what it means. (i) 8. Qualitatively describe the arrangement and devices that can be used to provide a ship with maneuverability at slow speeds. Namely: a. b. c. d. Rudder position Twin propellers Lateral thrusters Rotational thrusters (ii) 9.1 Introduction Ship maneuverability is a very complex and involved subject involving the study of equations of motion involving all 6 ship movements. Analysis of these motion equations allows predictions of ship maneuverability to be made. However, many assumptions are made, so model testing is required to verify analytical results. Once built, a ship’s maneuvering characteristics are quantified during its Sea Trials. To limit the level of complexity covered in this chapter, the analytical study of the equations of motion will be ignored. However, maneuverability requirements a ship designer strives to meet will be discussed along with the devices and their arrangements that can provide them. After completing this chapter you will have an understanding of how a ship’s rudder makes a ship turn and an appreciation of other devices that improve a ship’s slow speed maneuverability. 9-1

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