Embedded Files
F.5.8 Main Hoop
F.5.8.1 The Main Hoop must be a single piece of uncut, continuous, closed section steel tubing meeting F.3.2.1.g
F.5.8.2 The Main Hoop must extend from the lowest Frame Member / bottom of Monocoque on one side of the Frame, up, over and down to the lowest Frame Member / bottom of Monocoque on the other side of the Frame.
F.5.8.3 In the side view of the vehicle,
a. The part of the Main Hoop that lies above its attachment point to the upper Side Impact Tube must be less than 10° from vertical.
b. Any bends in the Main Hoop above its attachment point to the Major Structure of the Chassis must be braced to a node or Attachment point F.7.8 with tubing meeting F.3.2.1.h and F.5.9.5
c. The part of the Main Hoop below the Upper Side Impact Member attachment:
- May be forward at any angle
- Must not be rearward more than 10° from vertical
F.5.8.4 In the front view of the vehicle, the vertical members of the Main Hoop must be minimum 380 mm apart (inside dimension) at the location where the Main Hoop is attached to the bottom tubes of the Major Structure of the Chassis.
Explanation
F.5.8.1 The Main Hoop must be a single piece of uncut, continuous, closed section steel tubing meeting F.3.2.1.g
The Front Hoop has to be made of closed section metal tubing (i. e. tubes that have continuous sidewalls) and it also must match the requirements in the tubing chart from F.3.2.
Closed section metal tubing
Open Section metal tubing
F.5.8.2 The Main Hoop must extend from the lowest Frame Member / bottom of Monocoque on one side of the Frame, up, over and down to the lowest Frame Member / bottom of Monocoque on the other side of the Frame.
The Main Hoop should touch the bottom structure of the chassis on both sides of the chassis.
F.5.8.3 In the side view of the vehicle,
a. The part of the Main Hoop that lies above its attachment point to the upper Side Impact Tube must be less than 10° from vertical.
b. Any bends in the Main Hoop above its attachment point to the Major Structure of the Chassis must be braced to a node or Attachment point F.7.8 with tubing meeting F.3.2.1.h and F.5.9.5
c. The part of the Main Hoop below the Upper Side Impact Member attachment:
- May be forward at any angle
- Must not be rearward more than 10° from vertical
The part of the Main Hoop that is above the Upper Side Impact Structure can't be bent more than 10 degrees from vertical (in the forward backward direction)
The portion of the Main Hoop above the Upper Side Impact Structure has to be within 10 degrees of vertical.
Side view of the Main Hoop
Any bends in the Main Hoop above it's attachment point to the Major Structure have to be supported by another member.
This is the Major Structure
Here are the nodes where the Main Hoop meets the Major Structure
Here are where the bends above the Major Structure have support members.
c. The part of the Main Hoop below the Upper Side Impact Member attachment:
- May be forward at any angle
- Must not be rearward more than 10° from vertical
The part of the Main Hoop that sits below the Upper Side Impact Member (specifically the place where the Upper Side Impact Member connects to the Main Hoop), is allowed to be positioned forward of vertical at any angle, but it can only be rearward of vertical by 10 degrees or less.
The portion of the Main Hoop below the Upper Side Impact Structure: Orange marks what is an ok angle, red shows what is not.
F.5.8.4 In the front view of the vehicle, the vertical members of the Main Hoop must be minimum 380 mm apart (inside dimension) at the location where the Main Hoop is attached to the bottom tubes of the Major Structure of the Chassis.
The members of the Main Hoop that appear vertical in the front view need to have an inside dimension (the measurement from the inside portion of one tube to the inside portion of the other) of at least 380 mm. This dimension should be taken where the Main Hoop Connects to the Major Structure at the bottom of the chassis.
Page updated
Report abuse