1 hour ago, Bobsk8 said:

If you really apply power taxiing out, well over 30 MP, sometimes all 4 engines will autofeather. I use just enough power to get the DC6 to start rolling, usually under 15MP, and never have that problem of autofeather tripping. 

I have only had that problem on my last two flights, when I was using the reverse thrust of the propellers to move the plane backwards, I must have got heavy handed with the throttles. Thank you for your help Bob.

3 hours ago, Bobsk8 said:

If you really apply power taxiing out, well over 30 MP, sometimes all 4 engines will autofeather. I use just enough power to get the DC6 to start rolling, usually under 15MP, and never have that problem of autofeather tripping. 

I was still having the problem even while being gentle with the throttles, but I have found out what was causing it, the flight engineer was switching the auto feathering switch on, this was causing the engine to feather, I switched it off and now it does not happen.

I have been flying the DC6 since it first came out and the problem I was having with  the engine shut down only materialized yesterday, why I dont know, strange one.

Edited August 24, 20214 yr by Scimiter

7 minutes ago, Scimiter said:

I was still having the problem even while being gentle with the throttles, but I have found out what was causing it, the flight engineer was switching the auto feathering switch on, this was causing the engine to feather, I switched it off and now it does not happen

The autofeather is supposed to be turned on as the last thing, when completing the pre takeoff checklist. That is because if on the takeoff roll, an engine quits, at low altitude and airspeed, the pilot may not have enough time to manually feather the prop from the failed engine, before the aircraft hits the ground. The autofeather circuit looks for a MP pressure above 30" and then reduced, which would indicate that engine failed and autofeather should be activated for that engine. All normal operation. Just keep MP below 30 when taxiing into takeoff position, and I would advise below 20", prior to takeoff and the autofeather will not trip. Turning off the autofeather switch prior to takeoff is dangerous and would never be done in real life, unless you want to crash from an engine failure. 

1 hour ago, Scimiter said:

I have only had that problem on my last two flights, when I was using the reverse thrust of the propellers to move the plane backwards, I must have got heavy handed with the throttles. Thank you for your help Bob.

Reverse thrust after SU5 causes autotfeather problems. I never use it, I use a pushback app. In the real aircraft, reverse thrust is rarely if ever used. 

 

13 minutes ago, Bobsk8 said:

The autofeather is supposed to be turned on as the last thing, when completing the pre takeoff checklist. That is because if on the takeoff roll, an engine quits, at low altitude and airspeed, the pilot may not have enough time to manually feather the prop from the failed engine, before the aircraft hits the ground. The autofeather circuit looks for a MP pressure above 30" and then reduced, which would indicate that engine failed and autofeather should be activated for that engine. All normal operation. Just keep MP below 30 when taxiing into takeoff position, and I would advise below 20", prior to takeoff and the autofeather will not trip. Turning off the autofeather switch prior to takeoff is dangerous and would never be done in real life, unless you want to crash from an engine failure. 

Understood Bob, I think what I will do is switch it back on when I am about to take off. I will keep trying your suggestions though.

This happens to me all the time in the Longitude when I start from cold and dark, because I always forget to turn the generators on once the engines are running.