You try to discredit this guy on one hand, then use his material on the other? Did you think to ask him for a reference before trashing his integrity or motives? Why didn't you find your own chart instead of using one from someone you distrust? Maybe you'll do anything on a forum to advance your pro American agenda? Did you intentionally overlook the Griffon 61 chart? http://www.spitfireperformance.com/spit21ads.jpgthe graph on Mark William's site gives no ref. to the orginal source and WE KNOW HE HAS A VERY HIGH PRO-SPITFIRE BIAS! Also, the graph represents performance from the Griffon 61, 65, 66, 85, 86, and 90 - only the 61 and 65 are relavent for WWII, so the Griffon power ratings are probably overstated. These are the only BHP graphs I can find, so they will have to do.
This shows 2,050 at 8,000 ft. MS gear and 1,780 in FS gear, presumably without RAM. Still, I'm sure the Englander lies, just like the arrogant American.