https://www.fia.com/sites/default/files ... -04-25.pdf
3.9 Front Wing (FW)
3.9.1 Front Wing Profiles
Bodywork declared as “Front Wing Profiles” must lie within RV-FW-PROFILES.
In any Y plane, the following conditions apply:
a. There must be no more than four closed sections.
b. No closed section may contain any concave radius of curvature less than 50mm
c. The distance between adjacent sections must lie between 5mm and 15mm at their
closest position.
d. The rearmost point of every closed section must be visible when viewed from below.
e. With the exception of the rearmost closed section, the rearmost point of every closed
section must not be visible when viewed from above.
f. Assessing each closed section independently, the part of any closed section visible
when viewed from below may contain no concave radius of curvature.
g. Within 40mm of the rearward-most point of each closed section a line tangent to any
part of the section visible from below must have a positive slope. The slope of this line
will be considered in the Y-plane.
h. Within 40mm of the rearward-most point of each closed section, no part of the section
visible from above may be more than 8mm 10mm distant from the section visible from
below, if outboard of Y=500, or 15mm if inboard of Y=500.
i. Inboard of Y=300, the forward-most two closed sections, must have a maximum
thickness of at least 25mm when measured in the Z direction.
Furthermore, when considering the entire profiles, the following conditions apply:
j. The normal to any point of the profiles surface must not subtend an angle greater than
25° to a vertical plane that is normal to RS-FW-SECTION for the forward most two
profiles and 30° for any other profiles.
k. The rearward most point of every closed section, when projected in Z on to the
reference plane, must produce a single tangent continuous curve with no radius of
curvature smaller than 200mm.
l. The Front Wing Profiles must be arranged such that, when viewed from below, no part
of RS-FW-PROFILES may be visible.
Once the Front Wing Profiles are fully defined Gurneys of up to 10mm may be fitted to the
trailing edge of the upper surface of the rearmost section. These Gurneys are considered to
be part of the Front Wing Profiles and must satisfy the provisions of this Article with the
exception of sections (b) and (h) and, for the inner extremity of the innermost Gurney and
outer extremity of the outermost Gurney, section (j).
... (see link for omitted sections on FW Endplate, FW Tip, FW Diveplane, FW adjustment, and FW auxilliary components) ...
3.9.9 Front Wing Bodywork Group
Once the components defined in Articles 3.9.1 to 3.9.8 have been constructed in accordance
to the provisions of those Articles, and any subsequent operation of sub-assembly described
within those Articles has been applied, the resulting union of these components is defined as
“Front Wing Bodywork”.
3.11.4 Front Wing Bodywork to Nose
Once both the complete Front Wing Bodywork and the assembly referred to Article 3.11.2
are fully defined, the Front Wing Bodywork, ignoring any Gurneys, and the Nose must be
trimmed to each other, such that no overlapping surfaces remain. A fillet radius, up to 25mm,
may be applied along the intersections between these surfaces. Once all surfaces, ignoring
any Gurneys, are trimmed and filleted, only Nose bodywork and fillet and no part of the Front
Wing Bodywork, ignoring any Gurneys, may remain directly above RS-CH-NOSE.