+1 Blenheim is not broken.
It just takes a long time to get the hang of it. I have a reprint of the Mk IV manual and take off procedure is just like it is written. You can't do 100 octane overload take offs on the outer tanks just inner tank standard takeoffs though. For me its checking the temp every half second and adjusting the cowl flaps accordingly. Don't forget temp when diving or climbing either.
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