Ok then its straight line running not sustained turn performance. So wrt your comment :
"If the Bf-109E3 maintains his trim speed of 400 kph, he is tough customer for a Spitfire to deal with." I respectfully disagree. Obviously I prefer to accept the RAE's views rather than yours.
WRT the sustained turn performance based on RAE computation at 12000ft, 400Kmh/248mph (TAS). The Spitfire can sustain 2.95G giving an approximate sustained turn rate of around 14.0 deg sec. The 109 on the other hand can sustain only 2.3G giving an approximate turn rate of 10.5deg sec.
So according to the RAE The Spit at 12,000ft/400Kmh TAS has 0.65G sustained G advantage over the 109 and 3.5 deg sec sustained turn rate advantage. Thats a nose position advantage of just on 119degrees in a single 360 degree turn. Sustained turn radius wise the Spitfire is around 526ft smaller to boot. So based on RAE calculations the 109 is not so "tough a customer at 400Kmh" in any turn fight.
A 109 Pilot in this engagement is just going to watch the Spitfire translate aft in his canopy until he ends up nose in lead with guns firing. Best option for the 109 (imo) is as soon as he sees the aft translation back through his 3/9 line to ease off on the G (maybe holding the bank on for deception) extend (using his superior 1G Ps) then transition into a climb, get the separation he needs and come back into the fight at a later point..... and that sort of thing is exactly what the good On line 109 drivers do.
Ties in with the Historical record and what we see On line every day.
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