Editing Fan vault (section)

== Structure ==
The ribs of a fan vault are of equal curvature and rotated at equal distances around a central (vertical) axis, forming the conoid shape which gives rise to the name. In between sequences of conoids, flat central [[spandrel]]s fill the space. According to Leedy (1980), the fan vault was developed in England (as opposed to France and other centres of [[Gothic architecture]]) due to the manner in which English [[rib vault]]s were normally constructed.<ref name="leedy"/> In an English rib vault, the courses are laid perpendicular to the ''rib'' while in France they are laid perpendicular to the wall.