Weather engine

[Hardy Heinlin]

Hi Andrej.

So the best way is to leave the jet-streams to  randomize based on current season, or adjust them accordingly latest maps/data/forecast?

I would use the randomizer. Additionally, if you have a wind map that shows the current real-world jetstream trajectory and speeds, then you could fine-tune PSX's jetstreams accordingly.

Why does it match the real world data so well? Because ...

- The earth always rotates from west to east, and always cycles through the same seasons, always generating relatively regular corridors of planetary winds, always having warmer air and a higher tropopause near the equator and vice versa near the poles -- which is all the case in PSX too --, so the average global weather is pretty constant from year to year.

- Short flights are not much affected by wind changes: a big wind forecast error causes only a small ETA error because you will land soon after take-off.

- Long flights are more affected by wind changes, but a long flight also encounters a more averaged amount of both negative and positive errors, which statistically compensate each other on a long flight. Long flights encounter a more average global climate rather than a local special weather.


Cheers,

|-|ardy

[cavaricooper]

Craig-

Should you happen on this... I was able to use PSXWeather over the network.  I have, however, been getting some rather spurious wind data today.... Is there a suggested procedure to fully marry the correct ASN generated Wx to  the PSX/P3d combo. I do not use the PSX windshield display at all.

At what point does PSX get ASN direct weather, vs. PSXWeather correct(ed) weather?  Is there a way that PSX gets ALL its Wx from P3d?  Does one leave PSX Wx on OR off? I left it on and flew with VisualPSX sending P3d Wx and it seemed fine at lower levels- off at cruise FLs.  Now however, it's fine at cruise, but off in descents (crazy numbers in the 200s). 

I'm pretty "foggy" about the Wx injection trail from ASN to PSX so I suppose I'm really asking for "The Idiot's Guide to PSXWeather"

Ta- C

PS- For GodAtum- for my PCs I use ASN to drive Wx for P3d.  For the rMBP I use PSX Wx.

[GodAtum]

What is your preference for a weather engine and why? Rex, Active Sky or PSX inbuilt?

[craig1231]

Should you happen on this... I was able to use PSXWeather over the network.  I have, however, been getting some rather spurious wind data today.... Is there a suggested procedure to fully marry the correct ASN generated Wx to  the PSX/P3d combo. I do not use the PSX windshield display at all.

At what point does PSX get ASN direct weather, vs. PSXWeather correct(ed) weather?  Is there a way that PSX gets ALL its Wx from P3d?  Does one leave PSX Wx on OR off? I left it on and flew with VisualPSX sending P3d Wx and it seemed fine at lower levels- off at cruise FLs.  Now however, it's fine at cruise, but off in descents (crazy numbers in the 200s). 

I'm pretty "foggy" about the Wx injection trail from ASN to PSX so I suppose I'm really asking for "The Idiot's Guide to PSXWeather"

ASN injects its weather into P3D.
PSXWx simply reads the instantaneous wind direction, wind speed, altitude and temperature every 5 seconds.
PSXWx then interpolates between the nearest station metar and the P3D weather to calculate the tropopause weather.
PSXWx then injects the interpolated weather into the tropopause.

The problem is, with PSX we can only inject weather at the ground or at the tropopause, but not at the aircraft's position. So we have to calculate/project the weather to the tropopause level.

I have released a new version of PSXWx today, please feel free to give it a try...
http://aerowinx.com/board/index.php?topic=3120.0

Kind Regards

Craig

[G-CIVA]

What is your preference for a weather engine and why? Rex, Active Sky or PSX inbuilt?

ASN, switched 'ON' using Craig's brilliant piece of software & thus 'injected' into PSX passing F200 (unless the newer iteration says otherwise):

Therefore you can flight plan with PFPX (using the PFPX WX download) happy in the knowledge that ASN WX will be injected into PSX & this will be within a tolerance range of 5-10% of the PFPX WX downloads used for flight planning purposes.

"Why not use ASN WX in PFPX" I hear you cry?

the answer is simple my friends .....

ASN ONLY provides an instantaneous depiction of the spot winds.  It cannot & does not predict spot winds into the future.  Within the ASN set up configuration the user selects the chosen interval between WX downloads (mine is set to the shortest interval available).

PFPX WX WILL provide a prediction of the spot winds into the future at 6 hourly intervals for its integral flight planning processes & various flight planning product outputs.

Thus you achieve the (almost) nirvana of an aircraft encountering roughly the same spot winds as the flight planing software has used during the flight planning process.  Your flight plan will also include a WPT wind table detailing winds & temps along the RTE.

The only drawback is that the wind uplink function is useless.  You will have to go back to the old skool method of mandraulically entering WPT Wind & Temp data into the LEGs Pages & into the DES FORECAST Page.

I am sure Britjet et al can amuse us with many stories about "fingeritis" on the longer legs!

[Sylle]

ASN injects its weather into P3D.
PSXWx simply reads the instantaneous wind direction, wind speed, altitude and temperature every 5 seconds.
PSXWx then interpolates between the nearest station metar and the P3D weather to calculate the tropopause weather.
PSXWx then injects the interpolated weather into the tropopause.

Hi Craig,

I would have hoped to be able to use PSWx to feed ASN data straight to PSX as I don't have P3D for now...
As I read above PSXWx does not read the data directly from ASN but via the intermediate of P3D which makes P3D a key element of the setup, is that right?

Cheers,
Sylvain

[andrej]

Hi Andrej.

So the best way is to leave the jet-streams to  randomize based on current season, or adjust them accordingly latest maps/data/forecast?

I would use the randomizer. Additionally, if you have a wind map that shows the current real-world jetstream trajectory and speeds, then you could fine-tune PSX's jetstreams accordingly.

Why does it match the real world data so well? Because ...

- The earth always rotates from west to east, and always cycles through the same seasons, always generating relatively regular corridors of planetary winds, always having warmer air and a higher tropopause near the equator and vice versa near the poles -- which is all the case in PSX too --, so the average global weather is pretty constant from year to year.

- Short flights are not much affected by wind changes: a big wind forecast error causes only a small ETA error because you will land soon after take-off.

- Long flights are more affected by wind changes, but a long flight also encounters a more averaged amount of both negative and positive errors, which statistically compensate each other on a long flight. Long flights encounter a more average global climate rather than a local special weather.


Cheers,

|-|ardy

Dear Hardy,

thank you once again for an extensive reply! I will use the randomizer and if I know forecaster jetstreams I will adjust them accordingly. Is it OK to do this for a specific sphere, or entire planet? For example I will from EDDK-KORD. I don't have the change southern hemisphere winds?

Just an update: on my recent two flights, winds direction and speed was similar to all FLs (I will post screen shot once I get home). And despite that fact, I have arrived to my destination in accordance to planned fuel (+/- few tons; no more than 4), which is quite remarkable. I presume that's due to your statement "- Long flights" section.

I guess that in 2H16 I will take on java coding and have to create specific update of stand alone SimWX .  Or I have to start building my homecockpit sooner and use PSWX.

Cheers,

[Hardy Heinlin]

Is it OK to do this for a specific sphere, or entire planet? For example I will from EDDK-KORD. I don't have the change southern hemisphere winds?

Just the jetstream sections that are located adjacent to the EDDK-KORD corridor.


Cheers,

|-|ardy