Quote:
Originally Posted by IvanK
Some more grist for the mill 
The source is AVIA 6/9352 RAE Performance tests on the bF110 and BF109E
In the UK National Archives
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IMHO that graph illustrates how hopeless is it sometimes to come up with the 'correct' performance figures. All of these tests were performed with the same 109E-3, WNr 1304 by various establishments in varying power and aerodynamic conditions, and they all differ wildly.