Today's Message Index:
----------------------
1. 05:59 AM - Direction Indicator Needs (Summary) (Owen Baker)
2. 07:07 AM - Re: Mag switch through d-sub connector (Robert L. Nuckolls, III)
3. 11:28 AM - Re: Mag switch through d-sub connector (donjohnston)
4. 12:44 PM - Re: Re: Mag switch through d-sub connector (Robert L. Nuckolls, III)
Message 1
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Subject: | Direction Indicator Needs (Summary) |
6/14/2014
Hello Ken, Thanks for your response.
1) I had written: =9CI can not find that information on the MGL
web site. Can you please help me find it?=9D
And that is exactly what you did when you wrote:
2) =9CIf you look in the manual http://www.mglavionics.com/AV2.pdf
on page 10 you will see the definitions of the 2-D, 3D-A, and 3D-G
choices or operating modes.=9D
and
=9DI discounted purchasing the stand alone $500. magnetic heading
system for these reasons.=9D
3) I agree completely with your analysis and greatly appreciate your
input.
If I want the degree of stabilization that I interpret that 14 CFR
91.205 (d) (9) =9CGyroscopic direction indicator
(directional gyro or equivalent)" intends then I must purchase:
a) The AV-2 AHRS Display (VELOCITY Series),
b) Both the SP-6 and SP-7 Sensors (Full AHRS),
c) And, if I intend to mount the two sensors in the same location, an
SP-2 / SP-4 Connector.
d) For a total cost of USD $1305 plus shipping.
This increased cost over my earlier posted solution of using just the
display and the SP-6 sensor causes me to reconsider the potential
solutions to my problem, but I can not yet rule out the MGL solution
because of the additional expense. (An addict will go to some extreme
lengths to feed his addiction.)
Thanks again for your inputs and I continue to welcome any inputs that
others may have.
OC
'O C' Baker says "The best investment you can make is the effort to
gather
and understand information."
==
Time: 02:49:26 PM PST US
From: Ken <kleh@dialupatcost.ca>
Subject: Re: Avionics-List: Direction Indicator Needs (Summary)
Hi Owen
I agree that gps track does not equate to a gyro compass.
If you look in the manual
http://www.mglavionics.com/AV2.pdf
on page 10 you will see the definitions of the 2-D, 3D-A, and 3D-G
choices or operating modes.
The disadvantages column says "Cannot correctly compensate for tilt
during any form of turn due to centrifugal forces acting on the
accelerometers" That is for the 3D-A mode which is what you get with the
SP6 as far as I can tell.
The disadvantage column for the 3D-G (the best mode of operation with a
full AHRS) says "Can show very large errors if the horizon information
is invalid which could have a number of causes such as exceeding
operational limitations of the horizon system." I interpret this to mean
that you are back to the 3D-A mode if the attitude info is not
available.
This is the same results I found in my little experiments with a 3D
magnetic sensor. The results were only useable when flying straight and
level. I'd expect much better results near the equator of course. Again
I have no experience with the MGL products but lacking actual
performance reports, I discounted purchasing the stand alone $500.
magnetic heading system for these reasons.
Ken
Message 2
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Subject: | Re: Mag switch through d-sub connector |
At 03:19 PM 6/13/2014, you wrote:
>
>I'm trying to clean up the connections to a switch panel that has
>the mag switches. Is a D-sub connector appropriate for mag switch connections?
Are you intending to run p-leads through a
connector with other system wires? I presume
that you're wanting to 'unplug' all wires
from a panel so that it can be easily removed . . .
This practice is generally discouraged from
the simple perspective of complexity driven
drop in reliability . . . every connector adds
three new joints to every wire.
The more sanitary practice is to make your
wire bundle to the panel of sufficient length
that it can be removed and supported in some
way that allows access but without breaking
the bundle.
If you do decide to put connectors in the
p-leads, run them through their own separate
connector and bring the shields through the
connector on their own pins.
Bob . . .
Message 3
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Subject: | Re: Mag switch through d-sub connector |
nuckolls.bob(at)aeroelect wrote:
> At 03:19 PM 6/13/2014, you wrote:
>
> >
> >
> > I'm trying to clean up the connections to a switch panel that has
> > the mag switches. Is a D-sub connector appropriate for mag switch connections?
> >
> >
>
> Are you intending to run p-leads through a
> connector with other system wires? I presume
> that you're wanting to 'unplug' all wires
> from a panel so that it can be easily removed . . .
> This practice is generally discouraged from
> the simple perspective of complexity driven
> drop in reliability . . . every connector adds
> three new joints to every wire.
>
In this case, the switches that I'm using have solder lugs so there's already three
joints. I'm currently using faston and spade connectors for each wire. I
was simply trying to consolidate the connections to a single DB-25 connector.
>
> The more sanitary practice is to make your
> wire bundle to the panel of sufficient length
> that it can be removed and supported in some
> way that allows access but without breaking
> the bundle.
That's what I'm doing now. But identifying each wire and mating it can be really
tedious especially considering the location.
>
> If you do decide to put connectors in the
> p-leads, run them through their own separate
> connector and bring the shields through the
> connector on their own pins.
I can certainly do that. I just didn't know if the mags should be physically segregated
to a different connector.
Bob . . .[/quote]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=424831#424831
Message 4
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Subject: | Re: Mag switch through d-sub connector |
>
>That's what I'm doing now. But identifying each wire and mating it
>can be really tedious especially considering the location.\
Odds are that you can bundle the mag-wires in with
other, low victim-potential wires, with no difficulty.
Taking them through a connector doesn't add
significant risk . . . the wires get pre-flight
tested. Good compromise is run them through
their own connector.
Bob . . .
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