What is the maximum fleet angle that lifeboat winch lead sheaves should provide when fitted on a vessel?

The maximum fleet angle that lifeboat winch lead sheaves should provide, which is 8 degrees, is essential for ensuring safe and efficient operations. A fleet angle is the angle formed between the lead of the mooring line from the sheave to the winch, and the vertical plane of the sheave itself. Maintaining this maximum angle helps to prevent excessive strain on the rope or cable, which can lead to wear and potential failure.

If the fleet angle exceeds 8 degrees, it can cause the line to run off the sheave improperly. This increases friction and can create a risk of the line binding or getting chafed, potentially leading to malfunctions during critical operations such as launching a lifeboat. Therefore, adhering to the specified maximum fleet angle is crucial for the safety of crew members and the proper functioning of the lifeboat system.