[rebel-builders] Avionics shelf in tail - mounting AHRS unit etc
Posted: Sun Feb 19, 2012 5:25 pm
I did a little experiment with my mags while bench testing them. It came
after we noticed slight shifts of maybe one degree in heading on the HSI
that appeared random. Turns out that it was metal on our person. A 1/16"
drill bit six inches away produced a one degree shift in heading when
moved around. I wanted to find the effect of the steel shanks in the
Avex rivets so I came up with a 10" strip of 020 with spacing of 1".
Waving it around did not produce any movement of the HSI. They are
amazingly sensitive but it seems that 2 feet separation is a pretty good
number for aircraft structures.
Bob.
Ron Shannon wrote:
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after we noticed slight shifts of maybe one degree in heading on the HSI
that appeared random. Turns out that it was metal on our person. A 1/16"
drill bit six inches away produced a one degree shift in heading when
moved around. I wanted to find the effect of the steel shanks in the
Avex rivets so I came up with a 10" strip of 020 with spacing of 1".
Waving it around did not produce any movement of the HSI. They are
amazingly sensitive but it seems that 2 feet separation is a pretty good
number for aircraft structures.
Bob.
Ron Shannon wrote:
Well fiddle faddle. Although there is no reference to this in the AFS
documentation, there is some discussion on the AFS support forum about
separation, including 2 ft. separation being optimal, as recommeded by
Crossbow. However, Rob Hickman, AFS founder/owner, has his 10" apart in his
RV-10. (*http://tinyurl.com/dzv7td)* Looks like I'll be building a new,
extended base plate, so I can set the second one further aft, cantilevered
behind the bulkhead. A PITA, but doable. Thanks for the heads up.
Ron
On Sun, May 3, 2009 at 11:30 PM, Bob Palmer <rtpalmer@shaw.ca> wrote:
Ron,
I am surprised that your mags are so close together. I was told that
mine (Blue Mountain Sport) should be at least two feet apart.
Bob.
(Elite)
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