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The Vaurien is a dinghy designed by Jean-Jacques Herbulot in 1951, and presented in the Boat show in Paris in 1952. It was meant as a reasonable alternative for a boat with a crew of two, as much for its low cost, as for its simplicity to sail. The first units, sold in the mentioned Boat show, had a price equivalent to two bicycles of the time.
As a ship moves in the water, it creates standing waves that oppose its movement.This effect increases dramatically in full-formed hulls at a Froude number of about 0.35 (which corresponds to a speed/length ratio (see below for definition) of slightly less than 1.20 knot·ft −½) because of the rapid increase of resistance from the transverse wave train.
Rather than wait to design and build a new ship, the Lighthouse Board decided to purchase an existing ship and convert it into a lighthouse tender. It purchased Plymouth from the Winthrop Steamboat Company on 13 December 1899 for $77,500. On 18 December 1899 she was commissioned as a lighthouse tender and became USLHT Iris. The ship immediately ...
In 1938, the Kriegsmarine bought the unfinished ship and had it completed as a fleet tender. On 12 December 1938, the ship was named Tanga, after the port city of Tanga in the former colony of German East Africa and the Battle of Tanga fought there in November 1914. The ship was commissioned on 21 January 1939, being assigned to the 2nd ...
The bottom is flat in a river junk with no keel (similar to a sampan), so that the boat relies on a daggerboard, [16] leeboard or very large rudder to prevent the boat from slipping sideways in the water. [17] The internal bulkheads are characteristic of junks, providing interior compartments and strengthening the ship.
The lengthened hull space was used to install additional boilers; her old fire-tube boilers were replaced with more efficient water-tube boilers, and a second funnel was added. The performance of her propulsion machinery increased to 15.1 knots (28.0 km/h; 17.4 mph) from 5,064 metric horsepower (3,725 kW), with a maximum range of 3,400 nmi ...