Bilging of Midship & End Compartments | Intact WPA & Trim Explained | Ship Stability

This video explains the effect of bilging of midship and end compartments on a ship’s intact waterplane area, sinkage, and trim — using fundamental damage stability & lost buoyancy principles. First, we study bilging at midship, showing how loss of buoyancy occurs when a compartment floods below the waterline — and why the ship sinks until the lost buoyancy is regained from the intact hull. You’ll understand: • What bilging means and when free flooding occurs • Loss & regain of buoyancy after midship bilging • Intact waterplane area (WPA) concept • Bilging above vs below watertight flats • Loss of WPA & permeability corrections • Formula to calculate intact WPA after bilging Then we move to bilging at ship ends and its effect on trim: • Why displacement remains constant after bilging • How underwater volume shape changes • Shift of Centre of Buoyancy (COB) • Trimming moment formation • Why forward bilging usually causes trim by head This topic is highly important for: ✔ Chief Mate Phase-II ✔ MMD written & oral exams ✔ Damage stability understanding on real ships 🛳️ Visuals are for representational & educational learning only. 🌐 CONNECT WITH SAILOR RIDER YouTube: 👉    / @sailor_rider   Facebook: 👉   / 19imzynlrp   Instagram: 👉 https://instagram.com/sailor_rider?ig... Threads: 👉 https://www.threads.com/@sailor_rider 🔍 TAGS bilging explained midship bilging ship bilging stability intact waterplane area WPA ship stability loss of buoyancy regain of buoyancy bilging end compartment trim due to bilging centre of buoyancy shift trimming moment damage stability basics chief mate stability lesson MMD exam stability merchant navy stability concepts flooding and buoyancy ship damage control ship stability trim by head explained maritime stability tutorial #️⃣ HASHTAGS #ShipStability #ChiefMateExam #DamageStability #MerchantNavy #NauticalScience