This opinion was posted already in the other discussion, but unfortunately it was not possible due to refute it because the premature closing of that thread due to the behaviour of the poster.
However, the notion and implication that the only 100 octane fuel used by the Luftwaffe during the Battle of Britain originates to British stocks of 100 octane fuel, captured from British airfields in France after the premature leave by the British Army in June 1940 is a dangerous myth, which needs to be promptly refuted, before any credence is attributed to it. Even if I did not want to engage in continuing that discussion here, given that the title discusses the RAF use of such fuel in 1940, the above repetence of it warrants a proper refutation of the claim by poster 'gbailey'.
Some of the documents already posted from the Australian archieves already show that already in 1938 the British were concerned of German 100 octane fuel developments and the capacity to produce this fuel on an industrial scale. Please refer back to these before proceeding further.
Please also refer to the German datasheet of the DB 601N. This type of engine was developed for German 100 octane 'C-3' fuel use, and went into mass production in late 1939 (October 1939 via Manfred Griehl to be exact)
It extremely puzzling, to say the least, why would the Germans decide to mass produce an engine, specifically made for 100 octane fuel use, without having any own stock of 100 octane fuel. And then equip whole wings of fighters, bombers, and zestoerers with the said engine.
As the statements by 'gbailey' are said to be based on 'Document file number 043697, in the BP Archive at Warwick University, and specifically to 'Petroleum Board Enemy Oils & Fuels Committee. A Survey of the Results Obtained to Date in the Examination of Enemy Fuel Samples', please find below the original scans of the document below to these claims made.
The full document, of 76 pages, is not reproduced here due to size restriction, but it is available in its full at my website at Kurfurst - Your resource on Messerschmitt Bf 109 performance.
It should be noted, however, that during the war, there were different octane ratings used for aviation gasoline. Allied states generally preferred to give octane rating at its rich mixture, while the Germans preferred the CFR method, which gave the octane rating at weak mixture.
The bottomline of the story, the green 'C-3' type fuel that the Germans were calling 96 octane fuel by the CFR method, was the equaivalent of 96/110 octane fuel as the Allies would call it. In other words, actually a bit better at rich mixture and for knock resistance than ordinary 100 octane fuel.
Also it is evident from these documents that the British were aware of the existance and use of German 100 octane - for simplicity's sake lets ignore for a moment it superior qualities and call it the same since the summer of 1940.
Examples of such fuel were found and analysed in crashed Ju 88 and Me 110 aircraft. The use in the former type is especially interesting as the types capable of taking advantage of higher octane fuel were DB 601N-powered Bf 109Es and Bf 110Cs. These latter were already in service by July 1940. By the automn, 1200 DB 601N engines were delivered, divided amongst Bf 110, Bf 109 units, Bf 109F production and reserve engines. Priority was given to Bf 110 units until the automn for these engines. The use of 100 octane C-3 thus may appear to be superflous in German bomber aircraft, nevertheless is was an existing practice.
The British report do not seem to mention 100 octane fuel found in Bf 109s, but this may be due to the limited scope of the report. See the image of Bf 109E-4/N, W.Nr. 1190, 'White 4', is being unloaded by Curtiss workers. The Emil belonged to 4. Staffel Staffel of JG 4, and was flown by Uffz. Horst Perez on, when it was shot down on the 30th September 1940 over East Dean during the Battle of Britain. Note the fuel triangle with the '100' label, pointo to 100 octane fuel and the DB 601N.
As the statements by 'gbailey' are said to be based on 'Document file number 043697, in the BP Archive at Warwick University, and specifically to 'Petroleum Board Enemy Oils & Fuels Committee. A Survey of the Results Obtained to Date in the Examination of Enemy Fuel Samples', please find below the original scans of the document below to these claims made.
The full document, of 76 pages, is not reproduced here due to size restriction, but it is available in its full at my website at Kurfurst -
www.kurfurst.org
