That's is true, but except for the Beech 18, are there any
HS props on an airplane under 12,500 pounds?

The feathering on the HS is a electrical relay that turns on
a high pressure pump that operates at a pressure above
governor pressure. The Prop is feathered and the pump shuts
off. To unfeather the button is held in so the pump
continues to run and that causes the internal valve to move,
re-routing the oil so it unfeathers.

I wonder many pilots will take this to heart and open their
POH to the systems section?


--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.


"Scott Skylane" wrote in message
...
| 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
|