Who can point to what to change in aircraft.cfg for the Aircraft to roll on idle? As lowcost do, taxi on one engine.

Or maybe it is in the air file?
THNX

airfile, 1506 static thrust sea level. You will have to raise fN at the N1 level you want more thrust, which will also skew your idle fuel burn to burn more fuel 

Alternatively you could modify sim1.dll and reduce the rolling coefficient of friction, I have a few posts at fsdeveloper which explain what to do.

Edited October 10, 20223 yr by kand

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Edited October 11, 20223 yr by vl1

19 hours ago, kand said:

airfile, 1506 static thrust sea level. You will have to raise fN at the N1 level you want more thrust, which will also skew your idle fuel burn to burn more fuel 

Alternatively you could modify sim1.dll and reduce the rolling coefficient of friction, I have a few posts at fsdeveloper which explain what to do.

Much appreciated, Ken

It says Turbine Corrected Thrust Factor
Correct?

Will give it a try

4 hours ago, vl1 said:

Much appreciated, Ken

It says Turbine Corrected Thrust Factor
Correct?

Will give it a try

Yes, one axis is the scalar for thrust at sea level, the other is the N1. You want to increase the number at the corresponding N1 . Bear in mind this table is for corrected which means ISA values, 15c, sea level, 1013mb etc. The scalar represents to the static thrust value in the aircraft.cfg

I always used to hack sim1.dll for each point release on p3d because lowering the friction coefficient actually corrects the error, unfortunately LM have never fixed this.... 

38 minutes ago, kand said:

I always used to hack sim1.dll

Do you have instructions on how to do this?

3 hours ago, kand said:

Yes, one axis is the scalar for thrust at sea level, the other is the N1. You want to increase the number at the corresponding N1 . Bear in mind this table is for corrected which means ISA values, 15c, sea level, 1013mb etc. The scalar represents to the static thrust value in the aircraft.cfg

I always used to hack sim1.dll for each point release on p3d because lowering the friction coefficient actually corrects the error, unfortunately LM have never fixed this.... 

Therefore I am supporting the question above. How we do that?

https://www.fsdeveloper.com/forum/threads/ground-friction.440265/

https://www.fsdeveloper.com/forum/threads/how-to-modify-the-fuel-flow-on-idle.446620/#post-873941

https://www.fsdeveloper.com/forum/threads/friction-coefficient-of-taxi-runways-0-023.440794/#post-798853

Thanks!

There are a couple downsides to doing this, either with a sim1.dll hack, or with a table 1506 mod in the .air file.

The sim1.dll hack works, but some of the better add-ons already take the faulty friction coefficients into account in their FDE, and changing them in the dll will screw up TOLD performance with those add-ons.  So a one-size-fits-all change to the dll is problematic.  You could create several versions of the dll and swap them depending on the plane to be flown...a bit tedious, but possible.

To do things right in table 1506 usually requires adding one or two curves...the idea is to bump up the thrust at very low mach numbers associated with ground ops (e.g. <0.1) while preserving the thrust curves at higher mach numbers associated with flight.  The default acft and many/most add-ons use two curves, one at mach 0, one at mach 0.9--simply bumping up the values there will result in excessive thrust at idle inflight, affecting descent and landing performance.  The best way is to add another curve at ~M 0.1 and set the Mach 0 curve to thrust values that better represent performance at idle on the ground and will overcome the excessive ground friction  The curve at M0.1 facilitates smoothly returning the thrust values to the flight regime at higher speeds.  It may be better still to add another curve at ~M0.2 to allow for a more gradual transition.  You'll still see high fuel flow during ground ops.  The only way to cure this is programmatically within the panel gauges, as fuel flow in the sim engine is a function of thrust--higher thrust -> higher fuel flow.