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The 12lb boost calculation done by the RAE is an absolutely reasonable extrapolation.
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Well, then walk us through the explaination of how the engine data aligns with the graph. I would love to hear it.
Performance graph showing FTH of 11,000 ft:
http://www.spitfireperformance.com/s...-rae-12lbs.jpg
Engine data with RAM effect at max level speed showing FTH of 8,500 feet:
http://www.spitfireperformance.com/merlin3curve.jpg