Quote:
Originally Posted by Graham Boak
It is possible that the Finns were using fuel of a lower octane rating: this does seem to have been the case with their (and the Russian) evaluations of the Hurricane. The Russians are known to have set up a dedicated supply line supplying 100 octane to their P-39 units, but not to other (earlier) types. The Finns would not have had access to such supplies. It is perhaps arguable whether these Hawk 75 trials had such access either.
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It is my understanding that the Finnish tests were flown using 87 oct.