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1. 05:58 AM - Direction Indicator Needs (Summary) (Owen Baker)
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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
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