Sender: <marv@lancaironline.net>
To:  lml@lancaironline.net
Date: Thu, 12 Jun 2014 07:33:29 -0400
Message-ID: <redirect-6931303@logan.com>
Received-SPF: none
 receiver=logan.com; client-ip=173.201.192.235; envelope-from=tom@lachollatech.com
From: Tom Thibault <tom@lachollatech.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0
MIME-Version: 1.0
Subject: RE: ADAHRS lOCATION ON ES
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Both Randy Snarr and I have full-up Dynon installations in LNC2 models.

Don't know much about the cockpit of an ES, but Dynon wants you to avoid 
all ferrous metal that moves,  motors, fluctuating high current etc.  
The compass calibration can deal with some stationary ferrous metal.

In my case, I put the ADAHRS aft of the baggage closeout (just into the 
tail cone) on a fabricated composite shelf bonded to the side of the 
A/C.  It is fastened down with brass hardware.  BTW, if you use their 
heated pitot (with or without AOA) and with all aluminum lines to the 
ADAHRS, be aware that the aluminum lines WILL be the return path for the 
pitot heater current on a non-conductive airframe.  I found this out the 
hard way on mine.  Until I isolated it, the Dynon compass would swing 25 
degrees every time the heater cycled on or off.  The fix was just to 
insert a one inch section of non-metallic line in each of the three 
inputs to the ADAHRS.  That made the compass correct all the time.

Since Dynon installs are much more common in Van's A/C, the tech support 
folks were not aware of the issue on composite A/C.

Tom Thibault
LNC2