They were using tyres by the time I came along in the late 80s at Ohakea, but it makes most sense, the tyres would be left over from service vehicles + they don't move with the wind & airforce bases would always have enough wind to make plastic buckets a waste of time. Where would you get that many buckets from?
Tyres on big tracks were always interesting, it made the track hard to work out where it was going as they were spread out quite a ways so the first few laps were trying to sort the track in your mind while a few others got it wrong.
Maybe we should call the class F6.
Don't you look at my accountant.
He's the only one I've got.
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