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displayed wind/V on a flight deck and not in GA cockpits?

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displayed wind/V on a flight deck and not in GA cockpits?

Old 6th May 2022, 08:59
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displayed wind/V on a flight deck and not in GA cockpits?

As simple as it seems, all modern airliners (and biz jets) feature displayed wind/V. Flying also in light GA SEP, I haven't seen it yet in GA planes, however I haven't flown types like the Cirrus, let alone types like a PC12
First You need GPS info, AND an airdata computer that both feed their values to a separate computer that distils W/V from them.
Is the complexity and cost so high that it is prohibitive in smaller a/c?

Richard
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Old 6th May 2022, 09:18
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Not really the cost but the administrative burden of getting an EFIS into the cockpit of certified planes. The Garmin G3X and Dynon SkyView have been doing it for years in Experimental's, and, from memory, the early Dynon D100's have done it for a decade or more there too.

Now the G3X & SV systems are STC'd you're starting to see them in more light planes with all their features.
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Old 6th May 2022, 10:38
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If you want to display actual wind data (and not downloaded data from a ground source) you'll need some kind of inertial nav platform that is probably still cost prohibitive for GA aircraft.
I wouldn't know how digital attitude systems could derive both wind vector and speed from airborne sensors just using attitude information?
You can quite easily get an overall wind speed by comparing TAS and GS (from GPS or DME) but that's about it?
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Old 6th May 2022, 11:11
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All the info you need is there, GPS track, GS, heading and TAS are all you need. The Garmin G1000 does show wind information, almost in the same way as the EFIS on airliners - even the miniscule Aspen Evolution can now display a wind vector - which airplanes did you not see it on?
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Old 6th May 2022, 13:54
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W/V derived from a mathematical process called Kalman Filtering - it must be a complex process as it introduces a 7 or 8 second lag in the EFIS/FMC displays. More meat in the link above.

Same method and hysteresis with ATC surface wind processing and reporting. If you really need to know instant W/V ask for 'spot wind.'

Rob
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Old 6th May 2022, 20:34
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Originally Posted by STBYRUD View Post
All the info you need is there, GPS track, GS, heading and TAS are all you need.
And a Dalton Computor helps. Or some elementary trig ...

In fact you can get a pretty good handle on the direction and strength of winds aloft at different altitudes if you have access to Mode S/EHS, which carries all four of those parameters.
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Old 6th May 2022, 21:26
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No inertial nav needed, just any GPS groundspeed and track. The old ubiquitous Garmin 430 shows it, but you have to do half a minute of tediously entering info via the twisty knobs every time you want an answer; it doesn't continuously calculate and display it like fuller avionics suites do.
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Old 7th May 2022, 04:28
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Originally Posted by STBYRUD View Post
All the info you need is there, GPS track, GS, heading and TAS are all you need. The Garmin G1000 does show wind information, almost in the same way as the EFIS on airliners - even the miniscule Aspen Evolution can now display a wind vector - which airplanes did you not see it on?
The G1000 has wind vectors - but I have seen the main wind vector and the wind vector on the inset (both on the PFD) showing crosswinds from opposite directions at the same time. It normally occurs with light winds, but still curious how presumably the same calculations and data can come up with winds from opposite directions on the same PFD.
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Old 7th May 2022, 16:56
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Originally Posted by PPRuNe Towers View Post
W/V derived from a mathematical process called Kalman Filtering - it must be a complex process as it introduces a 7 or 8 second lag in the EFIS/FMC displays. More meat in the link above.

Same method and hysteresis with ATC surface wind processing and reporting. If you really need to know instant W/V ask for 'spot wind.'

Rob
In gliding we now have instantaneous true wind and lift/sink indications available from several manufacturers. Hawk is the best known one.

No reason you shouldn’t be able to get this in light a/c but it’s probably not so much of a game-changer as it is in a sailplane.
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Old 7th May 2022, 21:23
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As you well know it's regarding fully certified public transport aircraft with err, very mature processors and architecture. You know, the ones that had 256kb for the entire database...

Rob
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Old 9th May 2022, 05:34
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Originally Posted by 411A NG View Post
If you want to display actual wind data (and not downloaded data from a ground source) you'll need some kind of inertial nav platform that is probably still cost prohibitive for GA aircraft.
I wouldn't know how digital attitude systems could derive both wind vector and speed from airborne sensors just using attitude information?
You can quite easily get an overall wind speed by comparing TAS and GS (from GPS or DME) but that's about it?

‘411A NG’

Really, are you related to the original ?
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Old 19th May 2022, 13:55
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I am a relative new SkyDemon user, still learning. I use a tablet with a built in SIM card, so whenever possible, I have, or should have en route connection. Till now I never saw en route any wind displayed, like I see when on the ground during preps, I see the W/V arrows displayed at intersecting meridians and parallels.
Lo and behold, yesterday I made a nav trip here in Spain, and apart form visible W/V arrows there was some extra wind info in the en route data line, topside of the chart, see pic. But I guess this one is derived from an interpolation of the next W/V arrows around You, which are coming from a meteorological database. I have no idea why I never saw them, maybe there was an update on the program.
SD has no input from IAS/TAS nor HDG.

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