View Full Version : zero thrust

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.

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

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

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".


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... :)

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