I think the set up designed by Bristol was a lot better than many other systems on cars on the market at the time. Most production cars still had engine driven fans in the 1960s and 70s. I think in those days there was still an expectation that a car would not be stationary, with the engine running, for a long time. The Bristol fans were probably just not big enough for Australian summer weather. Forming a plenum for the fans to pressurise (or de-pressurise) is the key to really good performance, as other posts have pointed out.
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