Regarding the comment on relative difficulty in operating the 109 WEP vs just leaving the 12lbs 'on' with the Spit, please note that when operating the BCO one has to piddle about with the mixture, which isn't always that easy, or rough running occurs.
Regarding the oil pressure drop causing damage. RR performed tests on this and one Hurricane was subjected to 100 continuous rolls before any signs of damage occurred.
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