(k) On application to SNZ, a plate type chassisâ€&#x; monocoque can be considered the primary chassis structure. Rules T12-1-6(e), T121-7(a), (b) and (c) will not apply provided that side protection plates exceed 381mm by 3mm steel plate.
T12-1-7 Sideplates (a) A steel plate of 3mm minimum thickness and 381mm minimum height must be welded to the front & rear rollbars, the chassis/floor, and the upper side pipe or on each side of the car. The upper side pipe must be of minimum rollcage brace material. (b) Where the main lateral chassis members are at least 381mm apart the side plate/s can be welded to these lateral beams without additional upper sidepipes. (c) Where the driver's feet extend below the main lateral chassis members the 3mm side plate material must be welded on 4 sides to the lower extension of the rollcage as described in T121-6(e). (d) At all times the sideplate/s must protect the driver's hip and feet measured at right angles to the driver's body in the normal seated position. (e) No holes permitted in side plates. Drivers requiring an exemption from this rule must apply to the Directors. T12-1-8 Roof Plate (a) At all times there must exist a minimum of 100mm clearance between the top of the driver's helmet and any part of the roof plate and/or the roof plate mounting steel work. (b) A 6mm roof reinforcement plate must be welded to the rear roll cage hoop, with at least 200mm of roof plate on each side of the centre of the driver's helmet when in his normal seated position. (c) Lateral roll cage material at least 400mm centre to centre must link the front and rear roll bars and be welded on each side of the roof plate. â€œIf the roof plate does not extend to the full width of the roll cage, the roof plate must be welded to extra lateral bars and be gusseted to the main roll cage. Gussets to
2010 ELECTRONIC RULEBOOK