Point detail

Protruding parts of the external surface of an aerodynamic device shall not have a radius of curvature less than 2.5 mm. Those parts of the external surface of an aerodynamic device which are so located that, in their folded or retracted condition as well as when in operation, they cannot be contacted by a sphere 100 mm in diameter, may have a radius of curvature less than 2.5 mm. This requirement shall not apply to parts of the external surface which protrude less than 5 mm, but the outward facing angles of such parts shall be blunted, save where such parts protrude less than 1.5 mm.