- For engine seating a plate floor is required every frame
- Main engine seatings are in general integral with this double bottom structure.
- Inner bottom in way of the engine foundation has a substantially increased thickness.
- Often the machinery is built up on seatings forming longitudinal bearers which are supported transversely by tripping brackets in line with the double bottom floors, the longitudinal bearers being in line with the double bottom side girders.
- There are transverse plate floors at each frame. The thickness of the engine seating is governed by the power, weight, and length of the unit
1. High cost: Manganese bronze is a costly alloy, making it less economical for large propellers. 2. Low strength-to-weight ratio: Compared to other propeller materials like nickel-aluminum bronze or stainless steel, manganese bronze has a lower strength-to-weight ratio. 3. Susceptible to corrosion: Manganese bronze can corrode in seawater, especially when exposed to high velocities and turbulence. 4. Poor cavitation resistance: Manganese bronze is more prone to cavitation damage than other materials. 5. Difficult to cast and machine: Manganese bronze is challenging to cast and machine, making it less desirable for complex propeller geometries. 6. Limited weldability: Manganese bronze has poor weldability, making repairs and modifications difficult. Nickel-aluminum bronze or stainless steel are commonly used for propellers due to their: - High strength and durability - Excellent corrosion resistance - Good cavitation resistance - Ease of casting and machining - Weldability
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