Quote:
Originally Posted by Kurfürst
It may well be a simple emergency override for manual boost control, as was its original function, i.e. a the pilot manually controlling boost depending on altitude, which may well allow him to overboost and damage the engine.
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The Merlin was always equipped with an automatic boost control which prevented the engine being overboosted ie; with 100 Octane fuel it was potentially capable of reaching +17 lbs boost but the ABC limited it to +12 lbs for the Merlin II and III
