Message-ID: <3AEFF13B.858EC216@regandesigns.com>
Date: Wed, 02 May 2001 06:36:27 -0500
From: Brent Regan <Brent@regandesigns.com>
MIME-Version: 1.0
To: Lancair List <lancair.list@olsusa.com>
Subject: SFS AHRS mounting location
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Reply-To: lancair.list@olsusa.com

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
Tony asks:

"How does it work back there? Pitch excursions (G loads) must send the
primary flight display horizon wildly up and down."

While it is true that the AHRS's optimal location is at the roll/pitch/yaw
center, mounting it in the tail will not cause a noticeable degradation in
performance.

Among other things, the AHRS measures accelerations in 6 degrees of freedom,
three orthogonal accelerations (vertical, horizontal and lateral) and three
rates (pitch, yaw and roll). Since the airframe is a solid structure, the
rates are constant throughout the airframe. The orthogonal acceleration
variances due to AHRS position are small and cancel each other if the
airplane is held close to level.

I have my AHRS installed on the forward face of the 208 bulkhead with good
results. I placed it there to keep it out of the way of my size 13 EEEE feet
and to reduce magnetic interference.

Regards
Brent Regan

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>