NivaarExam PrepOfficial exam papers ↗

25-Nav-A2 Hydrodynamics of Ships (I)_ Resistance and Propulsion: December 2019

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Froude vs. Reynolds Scaling in Model Resistance Tests
  2. Question 2 Propeller Geometry Definitions
  3. Question 3 Minimum Model Size for a Resistance Test
  4. Question 4 ITTC 1978 Extrapolation to Full Scale
  5. Question 5 Preliminary Propeller Design for a Coastal Tanker
  6. Question 6 Cavitation Check by Burrill's Method
  7. Question 7 Kelvin Wave Systems and Constructive Interference
  8. Question 8 Wake-Field Effects on Blade Section Loading
  9. Question 9 Planning an Open-Water Propeller Test

Start with Question 1 →

National Exams — December 2019 — 16-Nav-A2 Hydrodynamics of Ships I: Resistance and Propulsion. Three-hour, closed-book exam; a data sheet, a propeller (Wageningen B4-55) chart and a Burrill cavitation chart are supplied. Format: Questions 1–7 are compulsory (attempt all seven), then one of Questions 8 or 9. All nine are solved below for completeness. Units follow the paper (mixed SI, with the historic Imperial-unit legend that duplicates on the supplied Burrill sheet noted where relevant).

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