Broaching in a powered vessel


Handling power craft in heavy weather


Watertight integrity Bow buries in wave trough


When the weather deteriorates badly, boats with large windows are at risk of having their watertight integrity breached. If one window is smashed and it is humanly possible to place it away from the weather, adjust your course and your plans accordingly. For example, if a forward wheelhouse window is smashed, consider seeking shelter downwind if this can safely be attained. Meanwhile, block the hole by any available means including mattresses, and advise the coastguard by radio or mobile phone.


Slow-speed motor boats without trim adjustment


Vessels in this category have no special technology to assist them as weather deteriorates. As with all power- driven craft, the seas are the danger rather than the wind, especially if they break in open water.


Upwind


Control speed to avoid slamming into the trough as you proceed over each succeeding wave top.


Boat broaches The beam sea


Not only is a beam sea uncomfortable for motor boats, a steep one that breaks from time to time is potentially dangerous. A study of the pages on sailing craft in heavy weather will show how any boat beam-on to the seas is vulnerable, while one that can keep herself more or less end-on is far better placed to deal with her situation. A wave does not have to be mountainous to throw your boat down or even roll her clean over. Any breaking sea higher than half her length places you seriously at risk.


Leaving her beam on to the waves


88 | MANUAL OF SEAMANSHIP


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