Effect of boost control cutout prior to +12 psi boost modifications

[Viper2000]

Originally Posted by *Buzzsaw*

Your conclusion the Spit II is modelled with +12 boost is incorrect...

It's not "my conclusion"; I haven't tested it at all. It's just what I've picked up from the forums.

In any case, it's beside the point, and arguments about it (legitimate though the are, since the whole point of the Merlin XII was to increase the FTH at +12 psi boost) belong elsewhere.

This thread is about the correct behaviour of the boost control cutout in aeroplanes that haven't been modified for +12 psi boost, my contention being that operating the cutout with the power lever fully forward should produce approximately +17 psi boost leading to rapid engine damage, based upon the sources I have cited in the original post.

Therefore I conclude that the original purpose of the boost control cutout was to act as a safety feature to guard against failure of the ABC fully closing the throttle and effectively failing an otherwise functional engine, and that combat power for an 87 octane Merlin III would be reached simply by advancing the power lever to give +6¼ psi boost and 3000 rpm.