TOC after Stepclimb

[JetNoise]

Hi everybody,

i saw this today: EETN - EDDF

Initial FL 330, later on climbing FL350.
As you can see, i reached FL350 well before (40NM) prior the indicated T/C.

Actually that screenshot was taken also late, because i was waiting for the indicator to vanish ;-)

But it did not, even when passing that point.

You might want to look at this.

Regards

Oliver

XP11.02 R1  Build 110201 (64bit), Windows 10. IXEG 1.1

[mmerelles]

The T/C is an estimation based on no winds, standard temperatures.

 

Under these scenarios you will reach T/C quite sooner than anticipated:

-Having colder temperatures than standard (more climb ratio)

-Having head wind component (moving upwards not forward as much as expected relative to the ground/distance)

 

As per your screen capture it seems you have been experiencing quite strong head wind components. Look at your GS is quite low actually. When having head wind airspeed will look the same, but the aircraft is actually not moving forward that much in relation to distance traveled TC/ground. The aircraft is basically climbing but not moving forward that much as expected during planning.

[Tom Stian]

The flight dynamics for the 733 is not correct also due to the changes that came with X-Plane 11.

So that will also make you reach T/C earlier when using XP11.

 

 

 

 

[JetNoise]

Thanks Tom Stian and mmerelles for your replys.

Fully understood (i read the FCOM as well ;-)

My understanding was, that the T/C indicator position is calculated based on the above mentioned parameters on a continuous basis.( whenever a/c is in a climb phase )

In my case: First level-off - cruise - step-climb - level-off

(If I recall correct, its like that an the NG, same for T/D)

We'll see how the XP11 flightmodel and VNAV is doing once its updated ;-)

Anyway: enjoying this aircraft everytime i fly it

BTW: will StepClimb (S/C point) somehow modelled ?? (since its avail in r/w according FCOM ??)

Best

Oliver

 

[Litjan]

Hi Oliver,

the T/C is calculated when you press the EXEC button - and then it remains static, even if the airplane climbs much better (or worse) than expected. It is rare to reach the top of climb at exactly the precalculated point in the real airplane.

Whenever you do a recalculation (like flying direct to a waypoint, entering a new climb speed, etc.) that requires you to hit the EXEC button, the T/C will be recalculated.

In the real plane the T/C symbol will also disappear as you fly past it, this does not happen (yet) on our model.

Cheers Jan

 

[JetNoise]

Thanks Jan, good to know. I'll try today afternoon ;-)

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Edited June 23, 2017 by Cebulon