The performance figures for the AH Spit IX match the Spit F IX, the very first model with the Merlin 61. It had a max boost of 15lb, the Merlin 66 used in the Spit LF IX used boost up to 18lb
Climb to 10k in the F IX took 2.7mins to 10k, 5.6mins to 20k. The LF IX took 2.15 to 10k, 4.75 to 20k.
Max speed of the F IX was 326mph at 4000ft, 363mph at 12,000ft, 378mph at 20,000ft. For the LF IX the figures were 354 at 4000ft, 383 at 12,000ft, 397 at 20,000ft.
There were approx 300 F IXs made, all in 42 and early 43. None had the E armament of 50 cals. Approx 4000 LFs were made from early 43 to 45, along with around 1000 HF IXs.
Rather than a SPit IX on 150 octane, what about the Spit VIII. 362mph at sea level, 400 at 12,000ft, 405 at 20,000ft. Rate pf climb at sea level 5,580 ft/min, at 11,000ft 5,100ft/min.
[ 06-27-2001: Message edited by: Nashwan ]