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3.8.4 Any vertical cross section of bodywork normal to the car centre line situated in the volumes defined below must form one tangent continuous curve on its external surface. This tangent continuous curve may not contain any radius less than 75mm :
a) The volume between 50mm forward of the rear wheel centre line and 300mm rearward of the rear face of the cockpit entry template, which is more than 25mm from the car centre line and more than 100mm above the reference plane.
[B, C, D omitted]
3.8.5 Once the relevant bodywork surfaces are defined in accordance with Article 3.8.4, apertures, any of which may adjoin or overlap each other, may be added for the following purposes only:
a) Single apertures either side of the car centre line for the purpose of exhaust exits. These apertures may have a combined area of no more than 50,000mm2 when projected onto the surface itself. No point on an aperture may be more than 350mm from any other point on the aperture.
b) Apertures either side of the car centre line for the purpose of allowing suspension members and driveshafts to protrude through the bodywork. Only one aperture may be added for each suspension member and no such aperture may have an area greater than 12,000 mm2 when projected onto the surface itself. No point on an aperture may be more than 200mm from any other point on the aperture.
5.8.1 With the exception of incidental leakage through exhaust joints (either into or out of the system), no fluids, other than those which emerge from the engine exhaust ports, may be admitted into the engine exhaust system.
5.8.2 Engine exhaust systems may incorporate no more than two exits, both of which must be rearward facing tailpipes, through which all exhaust gases must pass.
5.8.3 The last 100mm of any tailpipe must in its entirety :
a) Form a thin‐walled unobstructed right circular cylinder whose internal diameter is no greater than 75mm with its axis at +/‐10° to the car centre line when viewed from above the car and between +10° and +30° (tail‐up) to the reference plane when viewed from the side of the car. The entire circumference of the exit should lie on a single plane normal to the tailpipe axis and be located at the rearmost extremity of the last 100mm of the tailpipe.
b) Be located between 250mm and 600mm above the reference plane.
c) Be located between 200mm and 500mm from the car centre line.
d) Be positioned in order that the entire circumference of the exit of the tailpipe lies between two vertical planes normal to the car centre line and which lie 500mm and 1200mm forward of the rear wheel centre line.
5.8.4 Once the exhaust tailpipes, the bodywork required by Article 3.8.4 and any apertures permitted by Article 3.8.5 have been fully defined there must be no bodywork lying within a right circular truncated cone which :
a) Shares a common axis with that of the last 100mm of the tailpipe.
b) Has a forward diameter equal to that of each exhaust exit.
c) Starts at the exit of the tailpipe and extends rearwards as far as the rear wheel centre line.
d) Has a half‐cone angle of 3° such that the cone has its larger diameter at the rear wheel centre line.
Furthermore, there must be a view from above, the side, or any intermediate angle perpendicular to the car centre line, from which the truncated cone is not obscured by any bodywork lying more than 50mm forward of the rear wheel centre line.
I speak English, not Regulation, so there's the relevant portion of the technical regulations (I think) for someone else to figure out.
For the life of me, I simply cannot draw in my head what those words describe.