Quote:
Originally Posted by ATAG_Snapper
Thanks, Black Six. At last we finally know why the Spitfire Ia's top speed at sea level is 240 mph. The slope of the curve was simply applied to the 0 - 3000 m gap in information, so 0 feet = 240 mph. Mystery solved.
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This chart gives speed down to 0 feet. I think it's calculated as the test log only goes down to 3000 m.