- Letting go anchor cable speed vary between 5 ~ 7 mtr/sec.
- Heaving up speed 0.125 ~ 0.25 mtr / sec or 3 ~ 5 rpm.
- Full loaded duty of windlass commonly 4 ~ 6 time of the weight of one anchor.
- Warpends for mooring purpose and light line speed up to 0.75 ~ 1.0 mtr /sec
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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