[41Sqn_Banks]

Originally Posted by Crumpp

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

Let's have a look at +6.25 boost ...

FTH at 17,000 ft (http://www.spitfireperformance.com/merlin3curve.jpg)
Max level speed at 19,000 ft (http://www.spitfireperformance.com/s...-rae-12lbs.jpg)

Looks like max level speed is achieved 2,000 feet above the FTH. Pretty much in line with the difference for +12 boost.

Edit: I want to make clear that this 2,000 ft difference between FTH and max speed must not be present in reality, it's more a systematical difference between the two charts that must be considered when they are compared.