Hi Andy,
Like I said it's only what I've read, but it seems to be true enough.
Kettenhunde at the Ubi forum knows it better than me it seems though:
That margin for damage to the airframe is "1" for US, British, and French aircraft, Bill. In technical terms, that means there is no margin.
That means if it says 6G, then the aircraft will be damaged if you exceed that limit. There is no buffer from the published limits.
The Germans had a 1.35 margin of safety for damage limits. That means there is a buffer from the published limits if you make a comparison to United States, Britain, and French standards. In other words, for the same airframe strength, the Germans will publish lower limits. If the published limits are the same, the German aircraft is stronger.
The United States, Britain, and France had a 1.5 margin of safety limit for airframe failure. The Germans had a 1.8 margin of safety limit for failure.
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