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Old 05-29-2011, 12:39 PM
winny winny is offline
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Quote:
Originally Posted by Kurfürst View Post
OK, let me be clear too.


As for 100 octane, it was done to death. No evidence or documentation was ever presented by anyone, that would specifically say that all aircraft are using 100 octane, or even all aircraft are planned to use 100 octane. All we know is that the original early 1939 plans called for 16 fighter and 2 blenheim bomber sqns. to be provided with 100 octane by September 1940.The high octane stuff was introduced to select fighter (and some Blenheim bomber) stations in spring of 1940, from which it follows that not all had it. We also have evidence that further conversion of units was stopped in May 1940 due to concerns of overseas supply, especially as the Germans were sinking tankers at an alarming rate, and all 100 octane came from overseas; we also know that the conversion continued, and was finished later in the automn. We also know that about 2/3s to 3/4 of the avgas consumed in the BoB was 87 octane. We also know that there's evidence for about 1/3 of the fighter stations for 100 octane used, predominantly Sector stations and in 11 Group. Everything else is just a wet dream at the currently available evidence.

So I am patiently waiting for someone to post a primary document that would say that all Squadrons are using 100 octane. Until that happens, I consider it wishful and baseless, and contradicted by evidence.

As for the Rechlin tested Spitfire. You claimed that all Spits had 100 octane. Would it not be strange for the Germans, to capture a plane with 100 octane fuel in its tanks, and then test it with something else than 100 octane fuel, when they had plenty of supply of that, both captured stocks and their own production of high grade C-3 fuel..?
Of course, they may have operated it on 87 octane, but that would only make sense if the plane they captured also had 87 octane in its tanks when it was captured..



Yup.



So, how come the Germans captured one in such condition.. if it did not exist, as you say?
Stocks of 100 octane fuel as of April 1940


This document shows that by May 1940 all fighter command squadrons had recieved 100 octane fuel. Bomber Command had to wai till 1941 to be fully converted


100 octane conversions
611 squadron - 21/3/40

74 Squadron

602 Sqadron

North Weald

111 Squadron

Al Deere using +12 over Dunkirk - May 1940

Order for 100 octane fuel in 1938


I've also looked for Combat reports from May - July 1940 that mention +12lb
I counted 30 different squadrons that have combat reports from that time frame and used +12lb boost.

The germans tested the Spitfire Mk1 with thier own fuel at Rechlin. This lead to slightly decreased performance and unreliable performance data.
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