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The RAF training manual quote only mentions the use of boost control cut-out to obtain maximum permissible take-off boost.
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That is true.
What does it have to do with the fact the system was used before 100 Octane was an issue?
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If this is true, this renders the whole 100 octane debate obsolete as pilots would simply use the increased power if necessary independent of the used fuel.
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Right. From the certificate we see that a higher boost above +6 1/2lbs was available using the system on 87 Octane.
We also have Operating Note instructions in the General Operating Notes that allow for its use.
I bet Dowding did see a large increase in motor failures.