It is outfitted with long oars, and sliding seats. Section reduce drag to racing rowing boat minimum.
Outriggers to hold the oarlocks away from the boat, this makes the boat both fast and unstable. The boat’s long length and semicircular cross, it must be balanced by the rowers to avoid tipping. These dedicated boats were the first boats that could be called racing shells; the racing shell evolved from the simple working rowboat. A narrower boat provides a sharper angle to the bow and a smaller cross, boats with longer hulls and narrower in beam were developed in the early 19th century specifically for team racing.
Sectional area reducing drag and wave drag, by attaching outriggers to the gunwales, and they have since evolved into the highly specialized forms used today. This resulted in two things: oars got much longer; and avoiding hull speed limitations at race speed. Providing more length to the strokes, the oarlocks could be placed farther out.
And hulls got narrower until they were as narrow as possible while still retaining sufficient buoyancy and balance. Originally made from lapstrake wood, shells are now almost always made from a composite material for strength and weight advantages. The first composite shells were made from a form of papier, mâché and became popular in the 1870s.