ASN + PFPX

[Driver170 42]

Well i've just started out using ASN with PFPX and its a great piece of software slowly getting the hang of it all

Got a few points that need answered for those who run these two together! I open up ASN and run the live weather and then create a flight plan in PFPX save it and then open it up in ASN it gives me my route but when i compare wind/speed at cruise, they both don't match up say for example at cruise PFPX will give a waypoint of winds at 256/46 but its different to that of ASN? Now i thought they both are sync? And also is ASN flight plan, will it have all the waypoints etc as PFPX does? Just ASN seemed to be missing a few waypoints.

 

Thanks.

[Sportsfan23 2]

Yea I have noticed the discrepancy also when it comes to the winds. No idea what causes that or why. 

[kterz 49]

Hi,

 

read about and experiment with the "Interlayer interpolation"  option. If winds are reported as 230/60 at FL340 and 245/95 at FL390 and your cruise is at FL360, what winds should you get in real life? 

[Driver170 42]

Hi i'm not sure really messing about with it and don't know what am doing!

 

Also on ASN when i load PFPX flight plan into it on the weather briefing the data seems to be different to that of if i go into map or conditions at that airport they are different to the data in the briefing?

[kterz 49]

Hi Vernon,

 

I'd be happy to explain if you gave me a specific example, however I think this discussion does not belong to this forum.

[frogs 0]

In Pfpx's options, use ASN as the wx source. That way, pfpx will plan your flt using the exact wx that's going to be loaded in the sim. Just remember to start up ASN before planning a flt using PFPX.

[Driver170 42]

Hi kterz is there a asn forum? It seems to be ok now buddy thanks. Is there any good links to ASN like how to read reports and understanding it all?

 

One other thing does your briefing get updated each time through your cycle?

In Pfpx's options, use ASN as the wx source. That way, pfpx will plan your flt using the exact wx that's going to be loaded in the sim. Just remember to start up ASN before planning a flt using PFPX.

Thanks buddy thats what i do

[Sportsfan23 2]

In Pfpx's options, use ASN as the wx source. That way, pfpx will plan your flt using the exact wx that's going to be loaded in the sim. Just remember to start up ASN before planning a flt using PFPX.

 

I think what he means though is if you look at the wind speeds from PFPX and ASN they will be different. Like I just randomly looked up a flight from KDFW to KSEA at one of the way points LAA PFPX says the wind is 345/50 and in ASN the wind says 343/55. Now not much difference but there is still a discrepancy. That is how it is for each way point. They don't ever match up. Maybe that is just how it's supposed to be with the options I have selected in ASN as I never paid much attention to the wind before but I did notice the numbers not matching up. 

And I just read the thing about the interlayer wind interpolation which would lead me to believe that is why the winds are different?

[Driver170 42]

Where do i find the info about interlayer wind interpolation

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[Richard McDonald Woods 168]

I believe that the problem Vernon is having, which I do not have, is caused by misunderstanding the nature of the weather reported by PFPX and ASN.

 

The weather from PFPX is based on weather forecasts of conditions expected at each waypoint.

 

The weather from ASN, injected into FSX as you are flying, is the actual weather reported for the current aircraft position.

 

There is inevitably a lag between the the planned weather and that actually encountered, and variations from what was planned. This may help Vernon be happy with what he is seeing?

[Driver170 42]

Thanks richard that makes sense as pfpx flight plan can't update when you print it out on paper, but your ASN does if you know what i mean!?

[kterz 49]

Hi Vernon (and Richard),

 

The briefing page in ASN is also supposed to be "printable" and remains static (unlike the "live" and more concise briefing you may get in flight if you tune to 122.05). Having said that, there may be some things causing discrepancies:

 

- For surface conditions, ASN calculates the weather (parsing the TAF) at the ETA at the specified waypoint/airport. It doesn't just simply parse the current metar.

 

- For aloft conditions it's something similar (it calculates the forecast winds at the ETA), however here's where interlayer interpolation may confuse you. The raw aloft data provided by real weather servers is divided into certain (fixed) layers (3000-6000-9000 feet etc) as it can be seen in the conditions page. Until ASN, the winds at intermediate flight levels (like e.g. FL350) were assumed to match the closest layer (either FL340 or FL390). This simplified method is also used by flight planners (and pilots in real life) and in general is adequate for e.g. fuel planning. ASN however, when the cruise altitude is set to such an intermediate flight level, smooths the winds as we climb from e.g. FL340 to FL390 (if the "interlayer interpolation" option is checked, which is the default setting). This is the way things work in reality and we aimed to make this as realistic as possible (and this is what you'll get in the sim eventually). This however leads to these discrepancies between what ASN briefing page and conditions page (or PPFX) report. The conditions page reports the "raw" data while the briefing page reports the winds you'll actually encounter in the sim. If you want to disable this and make ASN behave more in a more "predictable" (albeit less realistic) way, you can uncheck this option.

 

Hope this clears things somewhat.

[Driver170 42]

You say parsing the taf what do you mean?

[Driver170 42]

Thanks just a bit confusing now! You said the briefing pagr is static but at thr bottom of your message says what you'll actually encounter so does the briefing page updates itself then?

Thanks just a bit confusing now! You said the briefing pagr is static but at thr bottom of your message says what you'll actually encounter so does the briefing page updates itself then?