Hi all,I have a question for folks who have purchased add-ons that purport to solve the "windshear" problem that the default real weather engine produces.In brief, this problem is presented when winds in one area are opposite in direction to those of an adjoining area; when flying from the first area to the second, the aircraft experiences a sort of windshear. Suppose, for illustration, that as you're flying with a 25-knot tailwind you enter a new wind area where there is a 25-knot headwind. FSX simply changes the winds instantly, leading to an instant 50 KIAS jump in airspeed. If you are within 50 knots of VNE, you are likely cooked.As I understand it, ASX solves this problem by loading weather for surrounding regions as well as the current region and smoothing the variations so that rather than experience an instant change in winds, the weather would instead gradually transition from one wind direction to the other, over which time the aircraft would maintain roughly the same IAS. This seems to me the most realistic way to deal with this problem (which I suspect is the result of the incomplete data that FSX is modeling the weather on.)I am also given to understand that FSUIPC has a feature that addresses the above problem in a similar manner.To conclude, my question is:Has anyone used any add-on to address the problem I described above, and if so, what did you use and how well did it work?Thanks very much!Matt

Fsuipc, is a real cheap option to fix the problem, it also helps smooth out the rather quick pressure drops. It isnt perfect but it certainly makes for a more realistic flying. Of course it also has a rather improved JS cal facility. so ut doees a lot more.

Could this effect happen in real-life flying?

Thanks for the info on FSUIPC.As far as the effect in the real world:Windshear is a real phenomenon, however it typically occurs only with severe weather and near the ground. An example would be a thunderstorm producing heavy downdrafts that spread outward in all directions upon hitting the ground. This can create currents of wind that run opposite the prevailing wind and, in essence, the effect seen in the MS real weather engine. The MS engine is unrealistic in that it creates such windshear areas in places where you wouldn't typically find them in real life - at cruise, with winds aloft.For a somber example of the reality of windshear and what it can do, see here: http://en.wikipedia.org/wiki/Delta_Air_Lines_Flight_191Anyone else have any experience with this? REX? ASX?Cheers,Matt

I use it in ASX and it does exactly as you described it, though you still get the turb at the initial onset. But like you said it has its limitations.

i have used fsmeteo, ask6.5, asx,asa, rex1/2, fsuipc.. i have yet to find a 100% satisfactory solution. from reading on their support sites and stuff it seems to some degree that nobody has really figured out how to perfectly override the winds as the jumps you describe are related to a simconnect bug or something in the fsx engine itself. ?they all use various techniques which have advantages and drawbacks and none has worked 100% accurately for me. if you setup fsuipc to really smooth out the jumps you can run into problems where it oscillates between the bogus values and, while avoiding an instant overspeed, you are constantly turning back and forth.. i generally use the pressure and temperature smoothing.rex is very stable and makes nice depictions, but winds aloft seem kind of like rolling the dice. i don't get many bad jumps but a lot of times the aloft winds are just completely different than what they were supposed to be.. sometimes it works perfectly, i think it might be related to location or something. the interface which is like a combo gps/radar is cool.fsmeteo is old school and had depictions that really didn't look any better than fsx default.asky6.5 i tried on a tip from someone else who was using it instead of their newer ones. it seems to have very stable and accurate winds aloft and works well in conjunction with fsuipc smoothing. the depiction is a step up from default but not nearly the level of rex/asa/asx, however.asa is very slick and has a lot of cool features. the depiction is good, i found generally without DWC mode the winds weren't as accurate or i'd have problems with them snapping back like at 200feet right before approach. with DWC it seems extremely stable but makes radar contact bug out, which is kind of a dealbreaker for me. asx isn't as complex as ASA but seems generally accurate and stable, and makes nice pastoral cloudscapes. asa/asx have this better than rex imho..although rex handles overcasts a little better maybe..i have also experimented with silly ideas like running asky6.5 and asa/rex at the same time, letting one overwrite the others clouds or winds, etc, and actually had some interesting results with some combos but none that were 100% stable.for practical use, most times i fly nowadays i use rex textures which are amazing, but with asx engine and fsupic temp/pressure smoothing. with this config the winds aloft are usually correct and it looks very good.i always use a low max visibility distance which allows for smaller coverage values as well, giving nice soft horizons while also improving performance in really dense clouds situations.i really wish i had a better answer about eliminating the pesky wind jumps completely but so far nothing has worked 100% for me.. eventually some day i think a clever dev will figure it out though as a lot of people complain about this issue.. ultimately i leave 'overspeed crashes' off and keep my fingers crossed.. (i never overspeed anyway except for this bug lol..) cheers,-andy crosby

I use Active Sky Advanced (ASA) for both FS9 and FSX and it does a great job of eliminating the sudden wind shifts. In ASA, the setting "enable direct wind control and smoothing" doesn't even need FSUIPC's wind control. Works great, last long time.

...if you setup fsuipc to really smooth out the jumps you can run into problems where it oscillates between the bogus values and, while avoiding an instant overspeed, you are constantly turning back and forth.. i generally use the pressure and temperature smoothing....

This turning back and forth is a problem with the wind variance (i.e. changing wind direction). Suppressing variance in FSUIPC fixes this.And FSUIPC is the only add-on that fixes the wind shifts - at least for me.Alex

This turning back and forth is a problem with the wind variance (i.e. changing wind direction). Suppressing variance in FSUIPC fixes this.

That is deliberately simulated when the weather set by whatever sets it shows variable direction winds. Indicated simply VRBL or nnnVnnn in the METARs, these should generally be mild -- i.e. with low wind velocities. You don't normally get much variance with stronger winds, one or two degrees as most. Are you seeing strong winds with lots of variance?The degree and timescale of these changes was determined by experimentation and feedback from expert pilots on what is realistic. It is based on a Gaussian distribution, like the turbulence emulation. There are parameters for adjusting it available in the FSUIPC4 INI file, but the values reached and used by default were those preferred during testing, for realism. I cvould chnage the defaults but I'd rather not.RegardsPete

That is deliberately simulated when the weather set by whatever sets it shows variable direction winds. Indicated simply VRBL or nnnVnnn in the METARs, these should generally be mild -- i.e. with low wind velocities. You don't normally get much variance with stronger winds, one or two degrees as most. Are you seeing strong winds with lots of variance?The degree and timescale of these changes was determined by experimentation and feedback from expert pilots on what is realistic. It is based on a Gaussian distribution, like the turbulence emulation. There are parameters for adjusting it available in the FSUIPC4 INI file, but the values reached and used by default were those preferred during testing, for realism. I cvould chnage the defaults but I'd rather not.RegardsPete

I see strong variance from time to time. Something like 50 degrees and more than 10 knots. What is more irritating is that this variance is not random at all. The wind direction changes slowly into one direction and then jumps back. This repeats constantly until I disable the variance in FSUIPC. Not a big issue. Whenever it occurs I switch it off and continue flying.I also use ASX.I'll try to save the situation and get a log file once I can reproduce it.Alex

I see strong variance from time to time. Something like 50 degrees and more than 10 knots. What is more irritating is that this variance is not random at all. The wind direction changes slowly into one direction and then jumps back.

Similar to this? : http://forums.simflight.com/viewtopic.php?...=433717#p433717Happens once in a while (I'm using ASA and FSUIPC on FSX). Mostly on approach - I use it as an opportunity to practice go-arounds.

I see strong variance from time to time. Something like 50 degrees and more than 10 knots.

Can you check the METAR for that, when it happens?

What is more irritating is that this variance is not random at all. The wind direction changes slowly into one direction and then jumps back. This repeats constantly until I disable the variance in FSUIPC.

Ah, it most certainly isn't programmed to do anything like that. That sounds like what the other comments have stated, that sometimes the underlying FSX wind gets through the FSUIPC defences. The direction it is tending to will be the one the weather program is trying to impose and to which FSUIPC's smoothing is changing slowly, and the one it jumps back to the one FS is still trying to impose.

Not a big issue. Whenever it occurs I switch it off and continue flying.

Well, nothing I've programmed to emulate variance and turbulence can give those symptoms. I think what is likely happening is that by effectively pausing the simulation when you go into the options, you effectively "jump" over the smoothing action -- FSUIPC will assume the current value is the correct one and allow it to be set without smoothing from the previous one as it was doing before interruption.

I also use ASX.

I use ASA, but not with the so-called "DWC" option. That "direct wind control" setting actually works by using FSX's facility to set global weather -- i.e. the same weather everywhere with no local progression -- and that "cures" the wind problem because FSX then never needs to interpolate. It's bugs in FS's interpolation algorithms which created this mess in the first place. The global fixed weather option was put into FSX by my request but it was intended to be for flight instruction purposes, where you want specific repeatable conditions.I sometimes see the symptom you mention, but here it has never been anything to do with variance. It's what the other chap says, I think, FSUIPC not being always able to defeat FSX in taking control of the wind.I've just uploaded FSUIPC version 4.561 to the Updates Announcement on my Forum. I've increased the frequency at which FSUIPC4 tries to "fix" the wind. Not by a huge amount, but, you never know, it might just be enough to get those that currently "slip through". Perhaps you could try that for a while and let me know?RegardsPete

Similar to this? : http://forums.simflight.com/viewtopic.php?...=433717#p433717Happens once in a while (I'm using ASA and FSUIPC on FSX). Mostly on approach - I use it as an opportunity to practice go-arounds.

Yup. Exactly like that and also on approaches only.

Can you check the METAR for that, when it happens?Ah, it most certainly isn't programmed to do anything like that. That sounds like what the other comments have stated, that sometimes the underlying FSX wind gets through the FSUIPC defences. The direction it is tending to will be the one the weather program is trying to impose and to which FSUIPC's smoothing is changing slowly, and the one it jumps back to the one FS is still trying to impose.Well, nothing I've programmed to emulate variance and turbulence can give those symptoms. I think what is likely happening is that by effectively pausing the simulation when you go into the options, you effectively "jump" over the smoothing action -- FSUIPC will assume the current value is the correct one and allow it to be set without smoothing from the previous one as it was doing before interruption.I use ASA, but not with the so-called "DWC" option. That "direct wind control" setting actually works by using FSX's facility to set global weather -- i.e. the same weather everywhere with no local progression -- and that "cures" the wind problem because FSX then never needs to interpolate. It's bugs in FS's interpolation algorithms which created this mess in the first place. The global fixed weather option was put into FSX by my request but it was intended to be for flight instruction purposes, where you want specific repeatable conditions.I sometimes see the symptom you mention, but here it has never been anything to do with variance. It's what the other chap says, I think, FSUIPC not being always able to defeat FSX in taking control of the wind.I've just uploaded FSUIPC version 4.561 to the Updates Announcement on my Forum. I've increased the frequency at which FSUIPC4 tries to "fix" the wind. Not by a huge amount, but, you never know, it might just be enough to get those that currently "slip through". Perhaps you could try that for a while and let me know?RegardsPete

as soon as I have the log and the metar I will contact you. I'll use the latest FSUIPC. But that can take a while. It does not happen too often. BTW: I do not use and wind smoothing options of ASX. They never helped me. FSUIPC is the only cure for wind shifts :( . Alex