Quote:
Originally Posted by Crumpp
Other than it is the specified fuel and listed in all the Operating Notes besides the Spitfire Mk II as the required fuel for the type?
Or the fact it is the largest portion of aviation fuel in the Air Ministry and 100 Octane does not make a significant portion of fuel at the airfields until after October 1940?
Seems a pretty lock tight case that 87 Octane fuel was used in considerable amounts....at least according to the Air Ministry.
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Actually the proportion of 100 Octane use cf "Other Grades"* rises well before October and stocks of 100 Octane were far healthier than "Other Grades" well before October.
Once again, the only engines cleared to use 100 Octane at the time were Merlin IIs (in reality no Merlin IIs were in frontline use by June 1940) IIIs, XIIs and XXs and Bristol Mercury XV. 52,000 tons of 100 Octane was used July-end October and only a few aircraft types were able to use the stuff.
Quote:
Originally Posted by Crumpp
Just the fact it is the specified fuel and the FC consumed millions of gallons of it.
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Not that Crumpp has actually proven this by providing one single piece of documentation specifying that only a few frontline FC units were allowed to use 100 octane while the rest had to make do with 87. Payton-Smith specifies that 87 octane was required for non-operational purposes.
Quote:
Originally Posted by Crumpp
Keep repeating it and might come true!!
It worked for Dorathy.
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*Crumpp and Kurfurst continually refer only to 87 Octane when other grades of fuel, such as D.T.D 224 (78 Octane, used for de H Gypsy engines etc) were also lumped in with 87 Octane, so the actual amounts of 87 Octane in stock and consumed are lower than the charts would suggest.