Generally a long narrow rowing boat (varying from 1 to 8 persons) is refered to as a "rowing shell" or simply "a shell"
In rowing, a boat propelled by oars is normally called a shell. Based on how many people are using the boat, and eight has eight rowers, a four has four rowers with one oar each and a quad has four rowers with 2 oars each. A pair has two rowers with one oar each while a double has two rowers with two oars each. A single has one rower with two oars in it.
It depends what type of boat! A rowing boat? A battleship? A ferry?
Oars and oars
Rowing Shell.
A typical four-man rowing shell is about 40 feet in length. Specific lengths on a few rowing shells from Vespoli (a well known company) can be found at the bottom of the page from this link: http://www.vespoli.com/boats/fours.php
A single oar is a long pole with a flat blade at one end used for rowing a boat. It is typically held by one person to propel the boat through the water on one side. Oars can be used in pairs to row symmetrically or singly for a different style of rowing.
In order to back a rowing boat, the rowers twist the oar handle 180 degrees turning the blade (end of the oar) around backwards. Then the rowing stroke is done in reverse. The blade is placed in the water toward the stern, then the rower pushes (rather than pulls) the oar handle away from their chest sending the blade through the water toward the bow of the boat. As long as each rower that is "backing" is paired with another rower that holds an oar on the opposite side of the boat who is also backing, this motion will "back" the boat down, rather than send it forward.
They setarted rowing when they were 14 years old. they were doing rowing since.
The most well known rowing event at the Olympic games involves the eight (8+) rowing shell. This shell is very fast with eight oarsmen producing a huge amount of power propelling this 65-foot boat.
It depended on whether they were rowed from the upper, middle or lower rowing benches but on avarage they were between 2 and 4 meters (7 and 13 feet) long.
It only has four rounds of hazards.