Flotation is a result of fluid being displaced at a perfect volume. Results is sad sights like: But so far the wood plug has worked perfectly. Charlie is cruising editor for sail and has been associated with the magazine since the mid-1990s.
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Hole in bottom of boat. Every professional who has seen this arrangement is horrified by it and tells me i must get a proper metal plug with threads. If the hole is below the water line and the boat is stationary and its bilge pump/s have less capacity to pump out water than the flow of water into the boat, then yes it will sink. A major fiberglass repair, such as patching a hole, can be a daunting task. He has more than 45,000 bluewater miles under his keel, including six transatlantics and three singlehanded passages, and has owned and maintained three different cruising boats over the years. That means that the boat is heavier, so it starts to sink, trying to displace more water.
The air pressure inside the boat is the same as atmospheric pressure. Has a deep sump and a keel-stepped mast, but also came fully equipped with a very effective bilge drain, located right at the bottom of the sump. You probably need to assume that your boat is shaped like a box with a constant kg/cm – kilograms of water needed to sink the boat an additional cm.