Audio Overview Chapter 1 Part 3 Ship's_Draft_Displacement_Hull_Deflection_and_Air_Draft

STABILITY AND TRIM FOR THE SHIP'S OFFICER, 4th Edition, by William E. George Audio Overview 1c Part 3: Ship's Draft, Displacement, Hull Deflection, and Air Draft Source Material: .Pages 14–24 This Audio Overview emphasizes the forensic formulas to intorduce density and the weighted averages of Drafts used to diagnose Displacement, Hull Deflection and Air Draft. I. Density Corrections (Forensic Correction) Correction to Displacement for Density: This formula identifies the specific weight adjustment required when the observed density differs from the standard 1.025 used in the Capacity Plan. Formula: Correction=1.025(1.025−Observed Density)×Displacement​ Change in Draft Due to Density: This formula predicts the vertical change in the waterline as the vessel moves into water of a different density. Formula: Change in Draft=Tons per Inch Immersion (TPI) or Metric Tons per Centimeters Immersion Change in Draft = (1.025−Observed Density) × Displacement​ / (TPI or TPC ) II. The Mean Draft Sequence Mean Forward Draft: The average of Port and Starboard Forward draft readings. Mean After Draft: The average of Port and Starboard Stern draft readings. Mean Amidships Draft: The average of Port and Starboard Amidships draft readings. Apparent Trim: The physical difference between the Mean After Draft and the Mean Forward Draft. III. Correcting for Hull Deflection: The Quarter Mean Draft (M/M/M) Mean of Means (M/M): The straight average of the Mean Forward and Mean After drafts. The Diagnostic of Deflection: Hogging: The Mean Amidships draft is less than the Mean of Means (M/M). Sagging: The Mean Amidships draft is greater than the Mean of Means (M/M). The Quarter Mean Draft (M/M/M): This weighted average accounts for the "Fatal Gap" of deflection to establish the most accurate displacement. Formula: 8Mean Fore+Mean Aft+(6×Mean Mid)​ IV. Vertical Clearances: Air Draft Definition: The vertical distance from the waterline to the vessel's highest point. Formula: Air Draft=Height Above Keel (K-T)−Actual Draft at that location Operational Significance: Essential for the safe passage under bridges and overhead obstructions. Produced by William E. George and Powered by Google's NotebookLM. Become a supporter of this podcast: https://www.spreaker.com/podcast/stability-trim-for-the-ship-s-officer--4180737/support.