Actual results in attached file with jpg of results for max speeds and climb for Spitfire MkIa/100oct.
This Spitfire seems to have closed about 50% of the gap to historical data, a similar upward tweak on top might do the trick. Generally speaking it is around 93%-95% of the A&AEE level speed results but only achieving about 65%-70% of the A&AEE climb results. NOTE these climb tests, including A&AEE, are with BCO off.
Template is attached and up to date for anyone wanting to test other aircraft. It would be good to see the 109s done this way for comparison by someone who knows how to fly them. Its easy, just fly accurately and the data is collected and also calculated to Standard Day performance. Instructions are included in zip file.
You can do Speed, Climb and Turn tests and as the ouput data is wide-ranging perhaps many other tests too. You can test many aircraft by just copying over the .bak mission file as Performance.mis. There is an aircraft at every 1000 feet (30 of them) for level speed at altitudes. You can create more missions for other aircraft. All aircraft are available at various bases. Be sure to edit the output file path to suit your PC (see instructions).
EDIT1: More data obtained. Drops off (dies) above 20,000 ft and it only flew up there because I set it there in the FMB. See thumbnail. It is impossible to maintain any kind of speed at 24,000 ft, the plot at 24k is just a representation as it was still slowly falling as was altitude. My climb test, see Edit2, began to fall apart above 18,000 feet.
EEEEK!! PLease ignore the label "CoD TAS at 2650 rpm", its a mistake, there is no curve for it.
EDIT2: Climb test jpg added. Time to 18,000 ft 10 mins instead of 6.7mins. R.O.C and therefore Time to Height fall away above 5,000 feet when tracking the A&AEE RPM/Airspeed test.
EDIT3: Aircraft fuelled to A&AEE test weight 6050lbs (98% CoD fuel).
EDIT4: Sorry I forgot my sources.
Climb:
http://www.spitfireperformance.com/n3171.html
"CLIMBING TRIALS"
Speed:
http://www.spitfireperformance.com/spit1vrs109e.html
"Spitfire MkI vs Me109E Level Speed Performance"
EDIT5: Added Turning tests and up to date zip file
Turning Test sources:
http://www.spitfireperformance.com/spit109turn.gif
Turn rate well below historical data and Radius of Turn too high.
Possibly related to the climb test problems.