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apart from noting that override boost was used in conjunction with a special fuel.
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It also notes that boost pressure is above what can be normally achieved with the take off boost override.
We know from the certificate altitude bench test that
+10.5lbs was achieved with boost override on 87 Octane fuel.
The achievement of
+12lbs is the rating for 100 Octane.
The Germans the same basic principle for in C3 Einspritzung. A very rich mixture to suppress detonation at very high manifold pressures.