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F.6.6.1 Frame Members of the Main Hoop Bracing Support system must be constructed of closed section tubing meeting F.3.2.1.i
F.6.6.2 The lower end of the Main Hoop Braces must be supported back to the Main Hoop by a minimum of two Frame Members on each side of the vehicle: an upper member and a lower member in a properly Triangulated configuration.
a. The upper support member must attach to the node where the upper Side Impact Member attaches to the Main Hoop.
b. The lower support member must attach to the node where the lower Side Impact Member attaches to the Main Hoop.
c. Each of the above members may be multiple or bent tubes provided the requirements of
F.5.2 are met.
d. Examples of acceptable configurations of members may be found in the SES.