Ship Stability Part 19 | LCF, Hydrostatic Draft & Trim Calculations Explained

This video (Part 19) focuses on longitudinal stability, explaining the Longitudinal Centre of Flotation (LCF), Hydrostatic Draft, TPC, Fresh Water Allowance (FWA), Dock Water Allowance (DWA), and Trim calculations. These are essential concepts for 2nd Mate (FG) and MMD examinations. Key topics covered in this lecture: (0:36–3:05) Longitudinal Centre of Flotation (LCF) Learn what the LCF is, why it is the pivot point for trim, and how the vessel rotates about this point during trimming operations. (2:15–4:23) Hydrostatic Draft Understand the concept of hydrostatic draft at the LCF and why it is used instead of mean draft for longitudinal stability calculations. (5:17–5:26) Hydrostatic Draft Formula Step-by-step explanation of calculating hydrostatic draft using trim corrections, including when to add or subtract values depending on trim by the head or stern. (5:35–6:18) TPC (Tonnes Per Centimetre Immersion) Explanation of TPC, its relationship with waterplane area and water density, and its importance in loading and draft calculations. (8:25–12:35) Fresh Water Allowance (FWA) & Dock Water Allowance (DWA) Learn how FWA and DWA vary with displacement, TPC, and draft, and how they are applied during loading operations between different water densities. (13:16–15:20) Correct Use of Signs A detailed explanation of positive and negative trim corrections, highlighting why selecting the correct sign is essential for accurate hydrostatic draft calculations. (15:43–16:51) LCF at Midships Understand the simplified calculation method when the Longitudinal Centre of Flotation is located at midships. (17:47–20:39) Trim Calculation (Total Change in Trim) Learn how to calculate the Total Change in Trim (TC) by comparing the vessel's initial and final trim during cargo operations. Key Learning Points: ⚓ Longitudinal Centre of Flotation (LCF) ⚓ Hydrostatic Draft ⚓ Trim by Head & Trim by Stern ⚓ TPC calculations ⚓ Fresh Water Allowance (FWA) ⚓ Dock Water Allowance (DWA) ⚓ Total Change in Trim (TC) This lecture is highly recommended for cadets, deck officers, and Second Mate candidates preparing for MMD written and oral examinations. ⚓ Ship Stability | Longitudinal Stability | LCF | Trim | Hydrostatic Draft | MMD Preparation LINK YouTube:    / @sailor_rider   Instagram:   / sailor_rider   Facebook:   / 19imzynlrp   Threads: https://www.threads.com/@sailor_rider TAGS ship stability part 19 longitudinal stability lcf explained hydrostatic draft trim calculations tpc calculation fresh water allowance dock water allowance 2nd mate stability mmd ship stability #MerchantNavy #ShipStability #DeckOfficer #MarineEngineering #Seafarers