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sarg314(at)comcast.net
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 Posted: Tue Jul 04, 2006 7:21 pm Post subject: D10A magnetic sensor alignment |
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I ordered my D10A with the external magnetic (compass) sensor. I was
thinking of installing it in a wingtip or behind the baggage bulkhead,
perhaps.
I just read the installation manual which says the magnetic sensor
should be installed oriented to match the orientation of the D10A (in
the panel) in pitch, roll, and yaw to an accuracy of better than 1
degree. This sounds impractical. Positioning it relative to a longeron
or rib or any component of the airplane could easily have 1 deg. of
error in it.You'd have to be able to measure the orientation of both
units in an absolute sense somehow to get this kind of accuracy.
Perhaps with a surveyors transit and an electronic level I could work it
out, but I have neither.
What have other people done? Does it really need this kind of
accuracy? Or am I the only one foolish enough to order it this way?
--
Tom Sargent, RV-6A
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dan(at)rvproject.com
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| Posted: Tue Jul 04, 2006 8:39 pm Post subject: D10A magnetic sensor alignment |
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You CAN measure the orientation pretty easily. Get out the digital
protractor...or it's time to beg/borrow/steal one if you don't have one
already. They're nifty little tools, worth blowing the bucks on imho.
See the photos on the bottom of this page:
http://www.rvproject.com/20030806.html and one at the top of this page:
http://www.rvproject.com/20030809.html
)_( Dan
RV-7 N714D
http://www.rvproject.com
---
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sarg314(at)comcast.net
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| Posted: Tue Jul 04, 2006 9:39 pm Post subject: D10A magnetic sensor alignment |
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Dan:
Thanks for the pictures (and whole website, for that matter), but
measure it relative to what? I think I can position it within a degree
relative to some bulkhead, but can't the bulkhead be slighly misaligned
with the whole plane or at least the instrument panel? A degree isn't
much.
Dan Checkoway wrote:
| Quote: |
You CAN measure the orientation pretty easily.
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--
Tom Sargent
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dan(at)rvproject.com
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| Posted: Tue Jul 04, 2006 10:15 pm Post subject: D10A magnetic sensor alignment |
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Relative to the instrument head itself. Basically measure the angle of the
panel, and add 90 degrees. That gives you your longitudinal offset. Since
the panel itself should be level laterally, level the EDC-D10 laterally.
"Yaw" is removed from the equation by using a bulkhead as the reference
perpendicular to the aircraft's centerline.
)_( Dan
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jeffpoint
Joined: 10 Jan 2006
Posts: 72
Location: MKE
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| Posted: Tue Jul 04, 2006 11:52 pm Post subject: D10A magnetic sensor alignment |
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Ditto what Dan said. Getting the thing level and plumb is not as hard
is they make it sound.
Get yourself a digital level. Lay it across the top of the Dynon face
and compare it to a level laid across the longerons, and you've got the
roll axis figured out. Make a board about 6 inches long and 4 inches
tall, so that you can lay the board on the top of the Dynon body
(lengthwise) and lay the level on that. Obviously make sure the wood
shim has exactly parallel sides. Bingo, you've got the pitch axis
figured. As for the yaw axis, you can get it close by measuring against
other bulkheads, including the instrument panel, but I think this is the
least critical of the three, since changes to the yaw axis are what you
are measureing with the unit, and a degree or 2 of install error will be
cancelled out in the calibration process.
As for mounting, I think my solution is about the easiest. Make an
aluminum mount to get it close, then use the brass screws and washers as
shims to get it dead nuts on.
http://home.mindspring.com/~rv6/RV6site/Dynon.htm
Jeff Point
RV-6
Milwaukee
13 days and counting till Osh......
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_________________
Jeff Point
RV-6
Milwaukee WI |
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