From 'megan' and RAF
the engine must be run at maximum continuous rpm
- my understanding is that that related to 'standard' axial flow engines and now-a-days it should read 'at design rpm'.
Shutting down a donk was SOP on the Lightning if short of fuel (weren't we always......
) for that very reason, plus there was very little trim drag associated with the event unlike a 'normal' twin.