🔍 Key Concepts

• Line shaft bearings and what purpose they serve in a propulsion shaft line • Difference between pedestal-type and flange-type bearings in terms of how they are mounted and supported • Why split housings might be preferred in long shafting systems for maintenance and installation

💭 Think About

• Think about how engineers access and replace a bearing on a long propulsion shaft that runs through multiple compartments—would a one-piece or split housing make that easier? • Consider where line shaft bearings are usually located in a ship: are they more often sitting on foundations on the deck/structure, or bolted to a bulkhead or vertical surface? • Ask yourself which arrangement makes alignment and periodic inspection simpler in a long, continuous shafting system.

✅ Before You Answer

• Verify whether line shaft bearings are usually mounted on a foundation or pedestal versus bolted as a flange to a bulkhead or frame. • Consider whether typical marine line shaft bearings are split to allow removal of the upper half without disturbing the shaft alignment. • Eliminate any option that would make in-situ maintenance (without removing the whole shaft) unusually difficult.