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Originally Posted by ATAG_Snapper
Spit Ia
FTH = 16500 ft
at 6.25psi, 2750rpm (rad open) engine fails after about 3 minutes. Just enough time to get stable 245mph IAS (with 3000rpm couldn't get this alt without engine death)
245mph IAS@16500ft = 323mph TAS = 520 kmh TAS
Oh dear, this is under even B6 plot speed (560kmh TAS at 16500ft).
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Max TAS for the Spit1a occurs closer to 22000 feet, not 16500.
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I really hope I making some kind of testing error here. Tried online and got same values. I wouldn't feel confident taking any Spit against 109s at alt with these values.
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The Spit 1a is faster than the 109 above ~6000 meters.