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F.5.5.1 The Chassis must include both a Main Hoop and a Front Hoop.
F.5.5.2 The Main Hoop and Front Hoop must be securely integrated into the Primary Structure using proper Triangulation.
F.5.5.3 Roll Hoop and Driver Position
When seated normally and restrained by the Driver Restraint System, the helmet of a 95th percentile male (see V.2.1.1) and all of the team’s drivers must:
a. Be a minimum of 50 mm from the straight line drawn from the top of the Main Hoop to the top of the Front Hoop.
b. Be a minimum of 50 mm from the straight line drawn from the top of the Main Hoop to the lower end of the Main Hoop Bracing if the bracing extends rearwards.
c. Be no further rearwards than the rear surface of the Main Hoop if the Main Hoop Bracing extends forwards.
A two dimensional template used to represent the 95th percentile male is made to the following dimensions (see figure below):
A circle of diameter 200 mm will represent the hips and buttocks.
A circle of diameter 200 mm will represent the shoulder/cervical region.
A circle of diameter 300 mm will represent the head (with helmet).
A straight line measuring 490 mm will connect the centers of the two 200 mm circles.
A straight line measuring 280 mm will connect the centers of the upper 200 mm circle and the 300 mm head circle.
F.5.5.5 Driver Template Position
The Driver Template will be positioned as follows:
The seat will be adjusted to the rearmost position
The pedals will be placed in the most forward position
The bottom 200 mm circle will be placed on the seat bottom such that the distance between the center of this circle and the rearmost face of the pedals is no less than 915 mm
The middle 200 mm circle, representing the shoulders, will be positioned on the seat back
The upper 300 mm circle will be positioned no more than 25 mm away from the head restraint (where the driver’s helmet would normally be located while driving)
