question

Update

It seem the following parameter is the cause,

1. prop_cx_parabol=1;

Setting this to zero, makes it feather properly.. setting it to one, and the propeller keeps spinning in the air.

How this can be tweaked? my understanding is the CX_parabol = 1 is the more modern formulas, and yet it would not allow the engine to feather properly.

Thanks in advance.
Raul

Hello @Simbol

You probably want to have a look at those parameters, especially the first one.
Their description is inaccurate in the current doc version but will be fixed with SU10.

Regards,
Sylvain

Hi Sylvain,

I have those variables set, I played with multiple numbers and the issued remained unless prop_cx_parabol was set to zero.

I have power_absorbed_cf = 1.0 and power_propeller_absorbed_cf = 1.0, and yet the propeller was not feathering correctly, keeps spinning.. only solution was to set prop_cx_parabol =0.. which is odd.

The if I change to prop_user_modern.. and I set the prop_mod_use_absorbed_torque=1, The issue remains despite of having the prop_cx_parabol set to 1 or zero.. propeller keeps spinning..

Is an odd behavior..

Any more clues?

Regards,
Raul

Further to the above, I wonder why when with the new prop model, and in say the B350, we fail an engine and the prop feathers, flying in a sideslip doesn't make it rotate again.

We can see it stands still if we perform some kind of aileron roll, supposedly due to the relative airflow, but as we sideslip the aircraft then the lateral component should be enough for the prop to start rotating again...