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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.
Explanation
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
The Main Hoop Brace Supports must be made of closed section tubing (i.e. continuous sidewalls) meeting F.3.2.1.i.
Closed section metal tubing
Open Section metal tubing
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.
The lower portion of the Main Hoop has to be connected back to the Main Hoop using members referred to as Main Hoop Braces. There has to be at least two Main Hoop Brace members on each side of the chassis. They are referred to as the upper and lower members, and they must be properly triangulated (break the space into triangles).
In our case, the lower portion of the Main Hoop is referring to the portion which is part of the Major Structure of the chassis.
This is a graphic pulled from the Major Structure definition. The blue portion of the Main Hoop is the lower portion that requires brace supports which this rule is reffering to.
a. The upper support member must attach to the node where the upper Side Impact Member attaches to the Main Hoop.
a. The upper Main Hoop Brace Support has to be attached to the Main Hoop at the same node which the upper Side Impact Member is attached to the Main Hoop.
This is probably to make sure the load path of a front impact is effectively transfered through the chassis without putting any members in bending.
The upper Side Impact Member and the upper Main Hoop Brace Support both connect at the same node (circled in pink)
b. The lower support member must attach to the node where the lower Side Impact Member attaches to the Main Hoop.
b. Similarly to the upper support member, the lower Main Hoop Brace Support has to be attached to the Main Hoop at the same node which the lower Side Impact Member is attached to the Main Hoop.
The lower Side Impact Member and the lower Main Hoop Brace Support both connect at the same node (circled in pink)
c. Each of the above members may be multiple or bent tubes provided the requirements of F.5.2 are met.
c. The Main Hoop Brace Suppots can be made of multiple tube or bent tubes, as long as they follow the guidelines for using multiple/ bent tubes outlined in F.5.2 (stuff like no crimping in the bends, minimum bend radius, etc.).
d. Examples of acceptable configurations of members may be found in the SES.
Notice how they show improperly triangulated examples with the white dotted line as a projection of where an extra tube would be placed to fix this issue.
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