Author: "townsetm" <yooper@...> Time: Tue Dec 14, 2004 6:31 pm PST Link
I hope he doesn't mind me posting the info, but here's what Alex at
rvtraining.com (a TruTrak dealer who broke the news of the ADI
product) said, regarding of the aiding of the new ADI product in
regards to the directional gyro (paraphrasing slightly):
"Tim the ADI is getting the Track information from the RS232 GPS
output. They don't need a magnetic slaving for the gyro, due to
GPS is so reliable that they rether integrate another feature. I'm
not in to much liberty to tell the world all the detail, but it has
to do with airspeed indication. I hope I was able to help some, any
other questions please let me know."
So, the horizontal DG of the ADI product is using GPS track . . .
TDT
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Author: "William" <wcurtis@...> Time: Wed Dec 15, 2004 12:38 am PST Link
--- In RV10@yahoogroups.com, "townsetm" <yooper@a...> wrote:
>
> "Tim the ADI is getting the Track information from the RS232 GPS
> output. They don't need a magnetic slaving for the gyro, due to
> GPS is so reliable that they rether integrate another feature. I'm
> not in to much liberty to tell the world all the detail, but it has
> to do with airspeed indication. I hope I was able to help some,
any
> other questions please let me know."
This makes absolutely no sense. Since TruTrack does not sell a GPS,
why would they make this new instrument dependant on one? If it is a
true Direction Indicator, then it should show which direction you are
pointed and not in which direction you are moving. If they are using
a GPS track to aligh a Direction Indicator then I would not want to
fly behind one since after a turn, your heading would be inaccurate,
also your are now dependant on the GPS system rather the the earth
magnetic poles. No matter how good GPS is, it's not as reliable as
the magnetic pole. Even 150,000 ring laser gyros, periodically align
themselves with magnetic north. If this is relying on GPS then why
would I not just get a Garmin GPSMAP 296? Same think as explained
above but with terrain.
William
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Author: "townsetm" <yooper@...> Time: Wed Dec 15, 2004 10:12 am PST Link
I believe there is a gyro in there, but it does need some reference
to align itself with occaisionally, to fight drift, as you imply.
Your three choices are:
a) manually set, like a mechanical HSI
b) reference to magnetic north (expensive)
c) reference to track (true north, essentially - inexpensive, since
most people have a GPS anyway.)
The advantage over "just" a GPS, I think is that because there is a
gyro in there, it's response rate in turns would follow the gyro,
i.e. fast, smooth response. Once you've completed your turn, your
GPS eventually catches up, and confirms with the gyro that he's going
the right direction.
Just don't call it "heading"!
TDT
--- In RV10@yahoogroups.com, "William" <wcurtis@c...> wrote:
> --- In RV10@yahoogroups.com, "townsetm" <yooper@a...> wrote:
> >
> > "Tim the ADI is getting the Track information from the RS232 GPS
> > output. They don't need a magnetic slaving for the gyro, due to
> > GPS is so reliable that they rether integrate another feature.
I'm
> > not in to much liberty to tell the world all the detail, but it
has
> > to do with airspeed indication. I hope I was able to help some,
> any
> > other questions please let me know."
>
> This makes absolutely no sense. Since TruTrack does not sell a
GPS,
> why would they make this new instrument dependant on one? If it is
a
> true Direction Indicator, then it should show which direction you
are
> pointed and not in which direction you are moving. If they are
using
> a GPS track to aligh a Direction Indicator then I would not want to
> fly behind one since after a turn, your heading would be
inaccurate,
> also your are now dependant on the GPS system rather the the earth
> magnetic poles. No matter how good GPS is, it's not as reliable as
> the magnetic pole. Even 150,000 ring laser gyros, periodically
align
> themselves with magnetic north. If this is relying on GPS then why
> would I not just get a Garmin GPSMAP 296? Same think as explained
> above but with terrain.
>
> William
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Author: "William" <wcurtis@...> Time: Wed Dec 15, 2004 1:27 pm PST Link
--- In RV10@yahoogroups.com, "townsetm" <yooper@a...> wrote:
> I believe there is a gyro in there, but it does need some reference
> to align itself with occaisionally, to fight drift, as you imply.
> Your three choices are:
> a) manually set, like a mechanical HSI
> b) reference to magnetic north (expensive)
> c) reference to track (true north, essentially - inexpensive, since
> most people have a GPS anyway.)
>
> The advantage over "just" a GPS, I think is that because there is a
> gyro in there, it's response rate in turns would follow the gyro,
> i.e. fast, smooth response. Once you've completed your turn, your
> GPS eventually catches up, and confirms with the gyro that he's
going
> the right direction.
>
> Just don't call it "heading"!
OK, I didn't want to do it, but something keeps naging me about GPS
corrected gyro so I took a look at the regulations on IFR
instruments. The main thing noted was that this would be a PRIMARY
IFR instrument, Reference FAR 91.205 (b) (instruments required for
VFR flight) item 3, Magnetic direction indicator, and (c)
(instruments required for IFR flight) item 9, Gyroscopic direction
indicator (directional gyro or equivalent). Now your whiskey compass
will suffice for (b) 3, but I would not accept a GPS track corrected
gyro for (c) 9. YMMV.
Dynon sells a magnetometer for around $200 and I think the Blue
Mountain Avionics version is about $400.
William
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