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F.5.11.1 Any item which meets all three of:
Located outside the Component Envelope F.1.15
Located above 350 mm from the ground
Could load the Main Hoop, Main Hoop Brace, or Shoulder Harness Mounting during a rollover
F.5.11.2 External Items must meet one of the two conditions:
a. Be attached at a Hoop to Brace node or a fully Triangulated structural node without the ability to create a moment at the node
b. When not attached at a node as described above, then:
Additional Structural bracing meeting F.3.2.1.o must be added to prevent bending loads
Additional calculations must be performed to show the member will not fail in bending or shear, even if unbraced
F.5.11.3 External Items should not point at the driver
Explanation
F.5.11.1 Any item which meets all three of:
Located outside the Component Envelope F.1.15
Located above 350 mm from the ground
Could load the Main Hoop, Main Hoop Brace, or Shoulder Harness Mounting during a rollover
External Items are Items/ components attached to the car that are: located outside the component envelope, mounted so that they exist above 350 mm from the ground, and could produce force on the Main Hoop, Mane Hoop Brace, or Shoulder Harness Mounting during a rollover.
a. Located outside of the component envelope:
Items mounted outside of this red zone which represents the component envelope (F.1.15)
b. Located above 350 mm from the ground
Items located above the 350 mm from the ground line.
c. Could load the Main Hoop, Main Hoop Brace, or Shoulder Harness Mounting during a rollover
The red members represent the Main Hoop, Main Hoop Braces, and Shoulder Harness Mounting Bar.
An external component would have the potential to create some load on any of these members in case of a rollover. This mean that there is a component connected to the car in a way that it would get stuck between the red members and the ground if the car rolled over.
The orange box represents an example of a component that would cause a load on the Main Hoop Braces if the car rolled over.
F.5.11.2 External Items must meet one of the two conditions:
a. Be attached at a Hoop to Brace node or a fully Triangulated structural node without the ability to create a moment at the node
b. When not attached at a node as described above, then:
Additional Structural bracing meeting F.3.2.1.o must be added to prevent bending loads
Additional calculations must be performed to show the member will not fail in bending or shear, even if unbraced
You can either mount your external item at a node (Main Hoop - Main Hoop Brace node or a fully triangulated node), or you can mount it somewhere else, with extra chassis members required.
If you mount your external item at a node, it can't have the ability to create a moment at the node.
In the picture on the left, the orange box represents an external item mounted at a Main Hoop - Main Hoop Brace node. If the chassis were to roll over to the right, the tip of the orange box hits the floor before the node does. Recall that a
moment = force * perpendicular distance
so this external item would create a moment on the node, which is prohibited.
*come back to this and figure out what would not cause a node (like what is the distance threshold?*
b. When not attached at a node as described above, then:
Additional Structural bracing meeting F.3.2.1.o must be added to prevent bending loads
Additional calculations must be performed to show the member will not fail in bending or shear, even if unbraced
If the external item is not attached to the chassis at a permitted node, you have to use additional bracing around the item to prevent bending loads.
The bracing has to meet F.3.2.1.o
and you need to do some calculations to prove that members (even unbraced) will not fain in bending or shear.
The bracing has to meet F.3.2.1.o
*how do our calculations prove something wont fail in shear? like under what load? also i kind of thought the whole idea was to prevent bending shear forces*
F.5.11.3 External Items should not point at the driver
External items should not point at the driver. This is a safety thing because if there was an impact or rollover, the external items could be crushed into the driver if they were in a close enough proximity. Some items have line of sight rules (meaning they have to be out of the line of sight of the driver, which is a more objective measurement that can be done using tangent lines)
What counts as pointing at the driver?
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