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malc4d
27th Oct 2009, 03:14
What power/prop settings do you guys find are best for zero thrust settings on a Dutchess and Seminole.

Birthday Boy
27th Oct 2009, 04:07
13 inches MAP and 2000 RPM for the Seminole and probably the same for the Duchess.

S-Works
27th Oct 2009, 11:18
Yep same here. 13-14" seems to work fine on both. Seneca as well while we are at it.

what next
27th Oct 2009, 12:21
Hello!

We use zero thrust power settings for the Seminole as per operating manual. There is a table in Section 4.49 (1989 issue) named "Practice one engine inoperative flight" which gives RPMs for zero thrust depending on indicated airspeed. Works nicely.

Greetings Max

malc4d
27th Oct 2009, 13:05
Ah thanks guys. Max, thanks for that. Our plane is the older one 1978 model, and that section is not in the poh..........just found in a 1995 poh :ok:

hugh flung_dung
27th Oct 2009, 15:17
It's easy to find out for yourself. Set aircraft in the appropriate configuration at the appropriate altitude, feather an engine, trim the aircraft out S&L, restart the engine, adjust MAP until the aircraft is in trim again. MAP now equals zero thrust setting.
BE76 and PA34 are usually around 11".

HFD

bfisk
29th Oct 2009, 17:01
Can't remember exactly but the first thing that came to my mind, for some reason, was 11,5" on the Seminole. Did about 250 hours of instructing on that thing, but it's a while ago... :)

malc4d
3rd Nov 2009, 20:18
Ahha found 11.5 mp 2000 rpm in an old Comair PA 44 training manual (old Seminole)