Bertrand Coconnier

Regarding the implications of the last topic I mentioned above, @jonsberndt wrote an interesting use case about [an engine out failure on a twin engine aircraft C310](https://sourceforge.net/p/jsbsim/bugs/29).

Pushed. Thanks !

@seanmcleod I have not yet read the document that @mvacanti wrote but I plan to. I am in complete agreement with your analysis of the computation of the force and...

@mvacanti > we would expect that the Total N moment calculated by JSBSim (absent other external forces) to equal the sum all propeller torque multiplied by the distance of the...

@rega0051 > The traditional definition of prop efficiency would be: eff = CT * J / CP. We really want: eff = (CT * J + CQ * n) /...

I have just re-read Stevens & Lewis' *"Aircraft Control and Simulation (3rd edition)"* especially the chapter 8.2 *"Propeller/Rotor Forces and Moments"*. If I am not mistaken, it seems that JSBSim...

@rega0051 > The approach in FGPropeller may no longer represent a set of good assumptions. We're using data that wasn't generated based on conservation-based approaches. In particular, in the static...

> In terms @mvacanti's issue with too small an N moment during the yaw the combination of underestimating the torque on the aircraft during RPM acceleration and overestimating when the...

> I read chapter 8 of Stevens & Lewis and agree with your observations in terms of the toque applied to the aircraft and the air velocity in the propeller...

> wonder if the problem of simulating a twin engine helicopter with JSBSim (see this old post https://sourceforge.net/p/jsbsim/mailman/message/29073718/) has ever been solved, satisfactory? No patch has been submitted to address...