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Sonar5

Heading concern on Default 172, 182: Looking for Ideas

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Hi Folks,I am looking for a solution regarding gyrodrift in MSFS2002 in the default 172's and 182's. And before you ask, I know I can turn off Gyrodrift in the settings and yes it will track correctly in that regard. I also know about recalibrating by Hitting the "D" key. This also does not occur in the Baron, or Caravan, or my Payware FSD Commander, but does occur in some add-on's using the default gauges from the 172 and 182 aircraft.First the screenpics depicting my concern.The first pic shows me at Ford Island, Hawaii which I used for my testing ground. I also emulated the same results at KLOT in Illinois.The runway is 22 which has a magnetic heading 220, It reflects accurately at Takeoff which is at 9:13:51 AM.http://ftp.avsim.com/dcforum/User_files/3ce01dee68831fd9.jpgThe second pic is after touchdown at 9:19:59 AM. As you can see the compass and ShiftZ Heading info, and GPS info are correct per the runway heading, but the Heading Indicator is off 12 Degrees after Only 1 pattern. As shown on the GPS, I have tested this with quite a few patterns in different aircraft in MSFS2002, including multiple times in the 182 and 172, calibrating after each one by hitting "D"http://ftp.avsim.com/dcforum/User_files/3ce01e0c68e14aec.jpgSo my question is, How can I get the default aircraft to use the Heading info from a different plane that does work: IE Which gauges should I be using to test this out, or has someone already figured this one out. Has someone used the Baron on a long x-country and experienced Gyro Drift like a real flight?I know about Gyro Drift, but it is never this bad in the 172's that I fly at Joliet, Illinois. So how can we fix it. I like flying with all realism settings enabled, so I would prefer to leave gyrodrift enabled.I am in no way slammimg the sim, nor do I desire you to. I am only looking for a solution to this.Related to this thread, but no viable solution listed, IMHOhttp://ftp.avsim.com/cgi-bin/dcforum/dcboa...orum=DCForumID8Thanks for your help,Joe :-waveEdit:I also did not have failure settings enabled during these tests. If this was real, it would be tagged INOP in a real plane. :-)End Edit:http://home.attbi.com/~jranos/mysig.jpg http://avsim.com/hangar/air/bfu/logo70.gif

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Hi JoeThe exagerated gyro drift in FS2002 can be adjusted. In the FS2002.cfg under "REALISM" look for the line "GyroEffect="The default is 1 but a realistic setting is 0.125 . That should do the trick.Take careMike

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Mike here is mine,[REALISM]INDASPD=0PFactor=0.420000Torque=0.420000GyroEffect=0.420000CrashTolerance=1.000000General=1.000000UnlimitedFuel=FalseTrueAirspeed=FalseAutoCoord=FalseRealMixture=FalseStressDamage=FalseSunGlare=TrueGEffect=TrueManualLights=TrueGyroDrift=TrueCrashWithDyn=FalseCrashDetection=0So mine is at 0.42 already and again if that was all that was needed, why only those aircraft, and not the Baron, Caravan, etc. I feel that if I lower it, I will not experience Gyrodrift in the planes that are correct already with that setting.I feel it is a gauge concern, and I would rather have it corrected than turn it off. Thanks Anyway,Joe :-wave http://home.attbi.com/~jranos/mysig.jpg http://avsim.com/hangar/air/bfu/logo70.gif

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Oh, I see. I did not read properly :-shyI do ot know why only some planes do that. SorryTake careMike

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That's ok Mike,I appreciate the response. I don't know code very well, so I am not really sure what to look for in order to change the gauge out in the panel.Others have posted about this before and are usually rebuffed and asked to turn it off. Well, I would like some realism and turning it off isn't too real to me.Thanks Again,Joe :-wavehttp://home.attbi.com/~jranos/mysig.jpg http://avsim.com/hangar/air/bfu/logo70.gif

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I have no idea about the gauges either. I also like to have it as real as possible. I have everything in Realism turned on. It's fun.I hope someone has an answer for you.Take careMike

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I'm talking off the top of my head about something I read a while ago, so take this with a couple grains of salt.IIRC, gyro drift is a function of how the gyroscope is powered. Planes in which the gyro is powered by the vacuum system will experience drift. For many newer/more expensive planes, the gyro is powered by {electricity? something else other than the vacuum} and they do not experience drift. Something like that.Therefore, if you're only seeing this in certain aircraft, might this explain why?*** Found it. :) Oddly enough, in the FlyII Manual. Has nothing to do with how the thing is powered. But some aircraft have another unit built-in (backup magnetic compass in another part of the airplane, such as a wing tip) that's used to periodically cross-check against the gyro and provide corrections.

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Hi,While that is fundamentally true, this does not occur in other vacuum powered system aircraft that I fly. I believe the Cessna Caravan has a Vacuum system, (not 100% sure on this, it has a suction Guage though), but this does not occur in that plane. That is why I checked out which ones it occured in and which ones it did not. I fully researched this, and my testing confirmed it.This drift after one pattern is almost consistently between 9-14 degrees. I have never in my real world Cessna 172 had to correct that much while in the pattern. Maybe flying across the country, but not around the patch in 15 minutes.IMHO It is excessive and needs a remedy other than turning it off. For most, it may not seem like a big deal. But it may be for me and others who have posted this in the past.Thanks for the response though, :-)http://home.attbi.com/~jranos/mysig.jpg http://avsim.com/hangar/air/bfu/logo70.gif

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Thanks for pointing out the gyroeffect in FS2002.cfg - I've never spotted that before. I've always turned off the gyro drift because it's far too excessive.I wonder if, flying with A/P in HDG mode, you would eventually fly round in circles?

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"Found it. Oddly enough, in the FlyII Manual. Has nothing to do with how the thing is powered. But some aircraft have another unit built-in (backup magnetic compass in another part of the airplane, such as a wing tip) that's used to periodically cross-check against the gyro and provide corrections"Just thought I'd let you know that the thing in the wingtip is called an RMI, remote magnetic indicator. In the cockpit is an HSI, or Horizontal Situation Indicator. These units are electrically powered (you were correct in your assumption) and automatically check gyro drift from the RMI and correct. In the cockpit is an override switch, in which you can select "Slaved" and "Un-Slaved". What this allows you to do is make drift corrections manually provided the RMI fails.mw

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Thanks for printing the explanation. Now I don't have to find, why on earth...... electric versus vacuum would make any difference in Gyro drift on it's own. I find this interesting, just because I'm involved with connecting the vacuum system on my own plane, at the moment.L.Adamson ----- wondering how many $1000's more a nice RMI/HSI would be?

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