Regardless, I think the effect of stopping a fixed pitch prop is much less than the effect of feathering a variable pitch prop. There was a NACA paper on this -- I'll try to dig it out.
NACA paper.
The table on the final page gives some experimentally measured drag values for a particular prop. I would infer:
* Compared to a feathered prop (which is much less draggy), a stopped prop, freewheeling prop and prop driving a dead engine are much of a muchness.
* A freewheeling prop has less drag than a stopped prop, which has less drag than a prop driving a dead engine
* A prop on a running engine throttled to idle produces thust at low speed, but almost as much drag as a prop driving a dead engine at high speeds.