Jim Macklin wrote:

snip/
Remember, on a single-engine, reducing rpm sends oil to the
prop and on a multi, reducing rpm/feathering drains oil from
the prop.



Well, generally this is true, but not always. Hamilton Standard
Hydro-Matic props, as used on the big radials, pump high pressure oil
*into* the hub for feathering. If you have complete oil loss, or let
the oil get too hot (and thin), you're out of luck for feathering.

Happy Flying!
Scott Skylane