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5.1.
(Drawing)
5.2. The front hoop
should run across the width of the vehicle and the top part must not lean
back any further than the angle of the windscreen. Bends may be used on
the connecting bars between the front and rear hoops but should not have
more than 4" / 100mm between 'a' and 'b' as shown above.
5.2.1. If a
bulkhead fabricated from tube and angle is used, the front hoop may be
welded or bolted to the top edge box material.
5.2.2. If the front hoop continues down to become a part of
the fabricated bulkhead structure, then the mounting must be as shown in
"Integrated front-hoop/bulkhead assembly" diagram. See para.
7.6.
5.2.3. Where a standard / original bulkhead is used, the
front hoop must bear down onto the chassis or suitably strengthened or
fabricated outriggers as shown in para. 7.1.
5.3.
Fabricated bulkheads and various methods of bolting or welding the front
hoop to a bulkhead fabricated from box-section.
5.3.1. (Drawing)
5.3.2. The item shown as
"bulkhead" in the following drawings refers to a bulkhead
fabricated from box-section or roll-cage grade tube.
5.3.3. (Drawing)
5.3.4. (Drawing)
5.3.5. (Drawing)
5.3.6. Note that the hoop
always rests on top of the angle iron to facilitate welding and to
prevent load being taken entirely on the weld. All bolts are to be a
minimum of 3/8" / 10mm high tensile steel.
5.3.7. (Drawing)
5.3.8. (Drawing)
5.3.9. Where the tube
material is equal to or greater than 1/4" / 6mm, then the hoop may
be welded directly on top.
5.3.10. Where the tube material is less
than 1/4" / 6mm, then a saddle of at least 1/4" / 6mm steel
must be used as shown.
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