If it was turning would the speed be
sufficient to allow pitch change or would it also be at flat
pitch?
I don't
know for sure but I think the answer is: if it's windmilling you should have
enough oil pressure to control pitch, IF you haven't lost all your oil. A
large percentage of piston engine failure modes involve oil loss, so personally
I don't think hoping for coarse pitch is a good bet with a non-feathering
propeller.
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