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The multi-chine hull approximates a curved hull form. It has less drag than a flat-bottom boat. Multi chines are more complex to build but produce a more seaworthy hull form. They are usually displacement hulls. V or arc-bottom chine boats have a V shape between 6° and 23°. This is called the deadrise angle. The flatter shape of a 6-degree ...
The puffers developed from the gabbart, small single masted sailing barges, which took most of the coasting trade.The original puffer was the Thomas, an iron canal boat of 1856, less than 66 ft (20 m) long to fit in the Forth and Clyde Canal locks, powered by a simple steam engine without a condenser, since as it drew fresh water from the canal there was no need to economise on water use.
Three Canadair CL-215 amphibious flying boats. The following is a list of seaplanes, which includes floatplanes and flying boats.A seaplane is any airplane that has the capability of landing and taking off from water, while an amphibian is a seaplane which can also operate from land.