zero thrust settings
 

Guys;
I searched the forums thinking this must have been discussed at some point (and I recall printing these off at some point along the way??) but what are the zero thrust settings for a NA Skymaster.

Thanks

I don't know about the NA 337 but the POH on my 1973 P337 has the zero thrust settings detailed in the emergency procedures section, I guess so we can practice engine out procedures.

They vary with altitude and which engine but are around 1800-1900 rpm.

Dave Dillehay
N84E

Here ya go, this is out of the 1968 Turbo Skymaster but is the same as the normal for this figure.

Long live 1968 Turbo Skymasters!

Paul & Mary

Please don't make the same mistake I did--assuming a general number. THe zero thrust rpm varies greatly with altitude.

In my case I was trying to quantify the degradation on rate of climb caused by bringing the gear up. Given that my worst case is at high density altitudes I made my experiment at 11,000 ft. Being an occasional dumb ass, I left the POH on the ground and just remembered the 1800-1900 ft number as stated in my earlier post.

On the front engine I was surprised to see no rate of climb at all with the rear at 1800 RPM. However, encouraging to me was that it did not worsen while retracting the gear--but please note that I have the gear door removal mod.

Back on the ground I discovered that the true zero thrust point on the rear engine at 11,000 feet was 2,300 rpm--not 1800! But the point of my test was proven and I do not worry about gear retraction on rate of climb. For me, with the gear door removal mod, I now retract the gear anytime I have no usable runway left.

Dave Dillehay
N84E

PS. To me, a former Seneca III driver who always worried about engine out issues, the gear door removal mod is the most important one a 337 can have. Not only is a engine out on take off not a adverse yaw and stall spin fatality problem, but you don't really have to land in the weeds!