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Originally Posted by Viper2000
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klem, I think the consensus is that the Spitfire IIa gives +12 psi boost when the cutout is operated, but since the gauge only reads to +8, you only see +8. However, I note with interest that the "no cockpit" gauge does read to +12, and yet this also only displayed +8 last I checked, so it's not obvious whether or not this is really a bug or a feature.
The Spitfire I notes say that operating the cutout with 100 octane fuel should give +12 psi as well.
I don't know exactly what is supposed to happen with 87 octane for several reasons:
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Really we need to try to find an old set of Notes for the Spitfire I from the 87 octane days to work out what the pre-mod boost control cutout was actually for, given that climbing boost and maximum boost are the same in the Notes I have which came with the CE.
The Hurricane basically had the same engine, as the Spitfire, and therefore I wouldn't expect to see different boost figures.
FTH for +12 was about 10000' at 3000 rpm for early Merlins, and therefore you should be able to get as much boost as you're allowed at 8000.
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Thanks for that.
My concern was that in three cases the boost didn't change at all (Spit1s and Hurricane DH 5-20) and the Rotol Hurricane boost barely moved.
Did I miss somewhere that these are 87 Octane and boost isn't effective?