I think I've mentioned before that my wife is Historian for Oregon Region
SCCA. Anyway, after reading some of the list messages this morning, I went
downstairs and grabbed the 1967 and 1971 GCR's.
The 1967 Appendix Z just covers roll bars and is only 3 1/2 pages long. It
allows the roll bar to be as much as 1 inch below the top of the drivers
helmet. It covers minimum bracing, but I cannot find where it precludes
stiffening the frame. In fact, it states "The roll bar must be designed in
such a way as to be an extension of the frame itself in such a way as to
properly distribute the loads."
In 1971, there was a major change in Appendix Z. The appendix grew to 5 1/2
pages and now included several drawings. One change was that the top of the
bar now had to be at least 2 inches above the drivers head. I remember
having to install a new roll bar in the Spitfire I now own as a result of
this rule change. Appendix Z states "It is recommended, but not mandatory,
except in Trans-Am competition, that all cars utilize a roll cage type of
construction." Again, I see nothing that limits stiffening the frame, quite
the opposite as it now includes "Considerable care must be used to add as
necessary to the frame structure itself in such a way as to properly
distribute the loads."
BTW in response to an earlier question about spoilers, it appears that this
is the first time that a front spoiler is allowed.
Jim Norlin
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