84.24—High-speed craft.
(a)
The masthead light of high-speed craft with a length to breadth ratio of less than 3.0 may be placed at a height related to the breadth lower than that prescribed in § 84.03(a)(1), provided that the base angle of the isosceles triangle formed by the side lights and masthead light when seen in end elevation is not less than 27 degrees as determined by the formula in paragraph (b) of this section.
(b)
The minimum height of masthead light above sidelights is to be determined by the following formula: Tan 27°=X /Y; where Y is the horizontal distance between the sidelights and X is the height of the forward masthead light.