"Jim Macklin" wrote in message
news:nqW2g.7077$ZW3.4090@dukeread04...
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

Oh for the simple life of fighters!! :-) I used Hamilton Standard props
quite a lot, but few of them feathered.
The 24D50 on my Mustang didn't feather of course :-) If I remember right,
the pitch range on my prop was something like 42 degrees.
Dudley