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"Dangerous" I don't believe appears in the NACA Spitfire document that is imo an embellishment
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No that is in the Operating Notes....
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The term unacceptable also needs to be qualified ... it was unacceptable to the criteria NACA was using.
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Yes, the only defined standards in the world at the time besides the German's. Post-war, the RAE adopted the exact same standards as the NACA.
So, we can say in 1940, the RAE had no standards, they just knew they had a dangerous airplane so they warn the pilot often.
In 1946, the early mark Spitfires would have been labeled as "unacceptable" by the RAE but since they had to have bob-weights, there was no need.
You won't find a Spitfire flying today without bob-weights.