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25-Nav-A2 Hydrodynamics of Ships (I)_ Resistance and Propulsion: Undated paper

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  1. Question 1 Flat-Plate Towing Force and Boundary-Layer Thickness
  2. Question 2 Froude and Reynolds Similarity in Model Resistance Tests
  3. Question 3 ITTC'78 Resistance Extrapolation to Full Scale
  4. Question 4 Transverse Wave Interference and the Corresponding Froude Number
  5. Question 5 Propeller Geometry Definitions
  6. Question 6 Blade-Element Force Vectors
  7. Question 7 Preliminary Propeller Selection for a Product Tanker
  8. Question 8 Cavitation Check by Burrill's Method
  9. Question 9 Planning a Model Open-Water Propeller Test
  10. Question 10 Wake-Induced Variation in Blade Angle of Attack and Lift

Start with Question 1 →

National Exams — May 2019 — 16-Nav-A2 Hydrodynamics of Ships I: Resistance and Propulsion. Three-hour, closed-book exam; a data sheet, a Wageningen B4-55 propeller chart and a Burrill cavitation chart are supplied. Format: Questions 1–8 are compulsory (attempt all eight), then one of Questions 9 or 10. All ten are solved below for completeness.

Reference texts: Larsson & Raven, Ship Resistance and Flow (SNAME) — model-scale resistance testing, Froude/Reynolds scaling, boundary-layer estimates and the ITTC 1978 performance-prediction method; Lewis (ed.), Principles of Naval Architecture, Vol. II — Resistance, Propulsion and Vibration (SNAME) — propeller geometry, wave-pattern interference, open-water B-series design and wake-induced blade loading; Carlton, Marine Propellers and Propulsion (Butterworth-Heinemann) — Wageningen B-series charts, the Burrill back-cavitation criterion and open-water model testing.