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Originally Posted by LcSummers
I read (dont know anymore where) that with the introduction of the Bf 109E-7 the flap for the nose/oil cooler vanished. All other models (F-K) didnt have them too.
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They didn't disappear, F-K had the oil cooler flap fully automatically controlled (no manual option). Not sure about the E-7 (have seen no manual for E-7), but I'd guess the E-7 had it manual like the other E-series.
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My question is if let the cooler flap (not the cooling system under each wing) open all the time wich negative results or disadvantages do i have.
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AFAIK oil has to be within certain temperatures, too low isn't good either - probably less lubrication, greater wear on engine. My guess is that closing the oil cooler was mean for on the ground for quicker warming-up.
Opening the cooling flap fully in flight probably has no disadvantage than increased drag, but, given it's small size/location, I don't think this would amount to much.