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A portaboat (also foldaboat, foldboat, folding boat, Porta-Boot, or porta-bote) is a type of small recreational boat that folds to flat for storage and transport.
Typical trim tabs on aileron, rudder and elevator. Trim tabs are small surfaces connected to the trailing edge of a larger control surface on a boat or aircraft, used to control the trim of the controls, i.e. to counteract hydro- or aerodynamic forces and stabilise the boat or aircraft in a particular desired attitude without the need for the operator to constantly apply a control force.
As the boat's speed increases, hydrodynamic pressure beneath the pad causes the hull to ride higher in the water, so that eventually the boat will be riding solely upon the pad area. At low speeds these hulls ride and handle similarly to a comparable V-hull; but at high speeds the padded hull can both out-accelerate and have a higher top speed ...
A keel cooler is a type of internal combustion engine cooling system used in marine engines.. In this system, engine coolant is circulated through a system of tubing outside the vessel's hull, using the lower temperature of seawater to reduce the coolant temperature via heat exchange before it is recirculated through the engine. [1]
Cross section of a vessel with a single ballast tank at the bottom. A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural ...
The reason for this is that when the boat is level, the drain or other opening will always be above the waterline, and so water will only flow out. At sea, when the boat rolls in the waves, the opening may sometimes be below the waterline. If the seacock is open, water may flood the boat, causing it to sink. Sea valve at lower right
The Marine Protector-class patrol boat is a type of coastal patrol boat of the United States Coast Guard. The 87-foot-long (27 m) vessels are based on the Stan 2600 design by Damen Group and were built by Bollinger Shipyards of Lockport, Louisiana. Almost all of these boats have been delivered to the U.S. Coast Guard, which has named them after ...
English: A schematic of a semi-closed internal combustion engine cooling system for ships. 1. Valve; 2. Pump; 3. Filter; 4. Cooling pipe; filled with chemical cooling substance; fully closed; cooled itself by seawater
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