When there are four rowers in a boat, each with only one sweep oar and rowing on opposite sides, the combination is referred to as a "coxed four" or "coxless four" depending on whether the boat has a cox. In sweep oared racing the rigging means the forces are staggered alternately along the boat. The symmetrical forces in sculling make the boat more efficient and so the quadruple scull is faster than the coxless four.[2] *Update Required*