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F.5.7 Front Hoop
F.5.7.1 The Front Hoop must be constructed of closed section metal tubing meeting F.3.2.1.c
F.5.7.2 With proper Triangulation, the Front Hoop may be fabricated from more than one piece of
tubing.
F.5.7.3 The Front Hoop must extend from the lowest Frame Member on one side of the Frame, up, over and down to the lowest Frame Member on the other side of the Frame.
F.5.7.4 The top-most surface of the Front Hoop must be no lower than the top of the steering wheel in any angular position. See figure following F.5.9.6 below
F.5.7.5 The Front Hoop must be no more than 250 mm forward of the steering wheel. This distance is measured horizontally, on the vehicle centerline, from the rear surface of the Front Hoop to the forward most surface of the steering wheel rim with the steering in the straight ahead position.
F.5.7.6 In side view, any part of the Front Hoop above the Upper Side Impact Structure must be inclined less than 20° from the vertical.
Explanation
F.5.7.1 The Front Hoop must be constructed of closed section metal tubing meeting F.3.2.1.c
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.
F.3.2 Chart
Closed section metal tubing
Open Section metal tubing
F.5.7.2 With proper Triangulation, the Front Hoop may be fabricated from more than one piece of
tubing.
Some chassis members are required to be made of one continuous tube (not multiple tubes welded together). The Front Hoop does not have this requirement.
You can see where I have zoomed in on the seam between members showing how this Front Hoop is made of multiple members
F.5.7.3 The Front Hoop must extend from the lowest Frame Member on one side of the Frame, up, over and down to the lowest Frame Member on the other side of the Frame.
The Front Hoop should touch the bottom structure of the chassis on both sides of the chassis.
The Front Hoop starts from the bottom of the chassis, goes up and over, and then goes back down to the bottom of the chassis.
F.5.7.4 The top-most surface of the Front Hoop must be no lower than the top of the steering wheel in any angular position. See figure following F.5.9.6 below
The Front Hoop should "contain" the steering wheel at any steering wheel orintation. This is another rule that is intended to protect the driver from contacting the ground in case of a rollover. They want the wheel to stay inside the rollover protection envelope to protect the driver's hands from the ground in case of a rollover.
F.5.9.6
F.5.7.5 The Front Hoop must be no more than 250 mm forward of the steering wheel. This distance is measured horizontally, on the vehicle centerline, from the rear surface of the Front Hoop to the forward most surface of the steering wheel rim with the steering in the straight ahead position.
The Front Hoop needs to be maximum 250 mm from the steering wheel. This measurement should be taken from the centerline of the car. It is important to measure the most rearward face of the front hoop to the most forward face of the steering wheel.
The distance between the rear surface of the front hoop and and the front surface of the steering wheel is shown in pink.
This measurment happens at the centerline of the car.
This is a picture from our SES that shows how we follow this rule.
F.5.7.6 In side view, any part of the Front Hoop above the Upper Side Impact Structure must be inclined less than 20° from the vertical.
The portion of the Front Hoop that is above the Upper Side Impact Structure needs to be within 20 degrees of vertical.
The Front Hoop has to stay within this pink window (which is 20 degrees from verical on either side).
Side view of the picture on the left.
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