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a. When a Roll Hoop attaches in three locations on each side, the attachments must be located at the bottom, top, and a location near the midpoint
b. When a Roll Hoop attaches at only the bottom and a point between the top and the midpoint on each side, each of the four attachments must show load strength of 45 kN in all directions
F.7.9.2 The laminate, brackets, backing plates and inserts must have sufficient stiffness, shear area, bearing area, weld area and strength to carry the load specified in F.7.9.1 in any direction.
Data obtained from the laminate perimeter shear strength test (F.4.3.4) must be used to prove sufficient shear area is provided.
F.7.9.3 Proof that the brackets are sufficiently stiff must be documented in the SES.
F.7.9.4 Each attachment point requires no less than two 8 mm or 5/16” minimum diameter Critical Fasteners, see T.8.2
F.7.9.5 Each attachment point requires backing plates which meet one of:
Steel with a minimum thickness of 2 mm
Alternate materials, if Equivalency is approved
F.7.9.6 The Front Hoop Bracing, Main Hoop Bracing and Main Hoop Bracing Supports may use only one 10 mm or 3/8” minimum diameter Critical Fasteners, see T.8.2 as an alternative to F.7.9.4 above if the bolt is on the centerline of the bracing tube to prevent loading the bolt in bending, similar to the figure below.
F.7.9.7 No crushing of the core is permitted