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From: William Miller <cwfmd@yahoo.com>
Subject: Pitot-Static for GRT ADAHRS & Magnetometer Placement in IV-P
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I purchased the GRT EFIS at Sun n Fun for my IV-P. I attached the magnetometers to the roof of the baggage compartment and the ADC/AHRS to the forward center floor nearby. This allows easy access for the flight test phase.  The magnetometer calibration worked well here. The ADC/AHRS is easily accessible for configuration variations in the pitot and static line connections, wiring harness additions, and attitude adjustments.

 I have about 70 hours experience in this airplane over the last 4 months, since I purchased it with 35 hours TT from West Coast Rockets. I have suspected a pitot-static calibration error. With water manometer and EFIS calibration I have about a 5 knot error on the mechanical airspeed gauge and another 7 knots error in the static system. I have a single static port mounted just below and forward of the corner of the baggage compartment door. I plan to add additional static sources. Does anyone have guidance for this on the IV-P ? This is another reason for the initial mounting of the ADC/AHRS in the baggage area.
Thanks
Bill Miller, MD
Naval Flight Surgeon(ret) & Test Pilot
USN TPS Class 92
N330FF 70 hrs
       
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I purchased the GRT <span style="border-bottom: 1px dashed rgb(0, 102, 204); background: transparent none repeat scroll 0% 50%; cursor: pointer; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;" class="yshortcuts" id="lw_1212708145_0">EFIS</span> at Sun n Fun for my IV-P. I attached the magnetometers to the roof of the baggage compartment and the ADC/AHRS to the forward center floor nearby. This allows easy access for the flight test phase.&nbsp; The magnetometer calibration worked well here. The ADC/AHRS is easily accessible for configuration variations in the pitot and static line connections, wiring harness additions, and attitude adjustments.<br><br>&nbsp;I have about 70 hours experience in this airplane over the last 4 months, since I purchased it with 35 hours TT from West Coast Rockets. I have suspected a pitot-static calibration error. With water manometer and EFIS calibration I have about a 5
 knot error on the mechanical airspeed gauge and another 7 knots error in the static system. I have a single static port mounted just below and forward of the corner of the baggage compartment door. I plan to add additional static sources. Does anyone have guidance for this on the IV-P ? This is another reason for the initial mounting of the ADC/AHRS in the baggage area.<br>Thanks<br>Bill Miller, MD<br>Naval Flight Surgeon(ret) &amp; Test Pilot<br>USN TPS Class 92<br>N330FF 70 hrs<p>&#32;



      
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