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07-02-2012, 11:03 AM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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Vern: Good catch. However, the Trio is showing too much Right rudder, wouldn't that put the heading off to the right instead of the large left angle shown on the HSI? 
__________________
Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G
ATP, CFII, A&P
2020 Donation+, Gladly Sent
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07-02-2012, 11:29 AM
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Join Date: Jun 2006
Location: San Jose, CA
Posts: 1,125
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Quote:
Originally Posted by DFlyer
A couple of comments. First, is that with the compass mounted in a magnetically clean area, and calibrated, it should be very accurate. And second, do you have a sliding canopy? If so, then you need to calibrate with the canopy slid forward. The frame of the canopy will magnetically interfere with the compass calibration when it is slid back.
-Robert
Dynon Marketing
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Yes, I do have a slider and I had the canopy open during the cal. I'll try it again with the canopy shut.
__________________
Kelly Johnson
San Jose, CA
RV-9A
Pink slip issued: 5/7/12
First flight: 5/28/12, Memorial Day.
Phase I Complete: 8/18/12!
2020 donation: complete
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07-02-2012, 11:32 AM
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Join Date: Jun 2006
Location: San Jose, CA
Posts: 1,125
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Quote:
Originally Posted by vlittle
When all else fails, check the obvious.
The slip indicator on your Trio indicates that you are flying with a lot of yaw.
this will cause your magnetic heading to disagree substantially with your ground track in zero wind situatons, thus indicating a crosswind.
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Yes Vern, that is a good catch. I've been working to get the plane to fly straight and obviously, I'm not quite done. However, I have stepped on the rudder pedal and it doesn't make a significant difference concerning the Dynon issue.
__________________
Kelly Johnson
San Jose, CA
RV-9A
Pink slip issued: 5/7/12
First flight: 5/28/12, Memorial Day.
Phase I Complete: 8/18/12!
2020 donation: complete
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07-02-2012, 12:22 PM
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Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,563
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Quote:
Originally Posted by ArVeeNiner
Yes, I do have a slider and I had the canopy open during the cal. I'll try it again with the canopy shut.
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I am going to say this is your culprit. When you mounted the magnetometer in the location you chose did you take into consideration the slider frame? The slider frame is steal so if it is slid open and within close proximity to the magnetometer it will affect the reading. I bet you will see a difference when you recalibrate with the slider closed.
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07-02-2012, 01:16 PM
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Join Date: Mar 2005
Location: Ramona, Ca
Posts: 259
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Is that wind vector on the Dynon correct (205-216 deg @ 68-72 mph) ? With that much wind you would have to have the aircraft pointed in that direction in order to track the course on the bug.
__________________
Bill RV-9A Flying
FFI- Flight Lead
N99WC
Ramona, CA (KRNM)
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07-02-2012, 01:55 PM
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Join Date: Jun 2006
Location: San Jose, CA
Posts: 1,125
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Quote:
Originally Posted by BillC
Is that wind vector on the Dynon correct (205-216 deg @ 68-72 mph) ? With that much wind you would have to have the aircraft pointed in that direction in order to track the course on the bug.
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No, that's exactly the issue.
__________________
Kelly Johnson
San Jose, CA
RV-9A
Pink slip issued: 5/7/12
First flight: 5/28/12, Memorial Day.
Phase I Complete: 8/18/12!
2020 donation: complete
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07-02-2012, 02:09 PM
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Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,563
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Quote:
Originally Posted by ArVeeNiner
No, that's exactly the issue.
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The readout for wind speed will not be accurate if your magnetometer is not calibrated correctly. The calculations are using the magnetometer readings as one component of many in the formula. A small number variation from the magnetometer can cause a large deviation in wind speed numbers displayed. Do the re-calibration and test again.
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07-02-2012, 02:29 PM
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Join Date: Jun 2006
Location: San Jose, CA
Posts: 1,125
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Quote:
Originally Posted by RVbySDI
I am going to say this is your culprit. When you mounted the magnetometer in the location you chose did you take into consideration the slider frame? The slider frame is steal so if it is slid open and within close proximity to the magnetometer it will affect the reading. I bet you will see a difference when you recalibrate with the slider closed.
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I recall my roll bar being magnetized during the build. I degaussed it but I never checked the slider frame as I recall. My money is on the slider as well, Steve.
Thanks. I will perform a re-do soon.
__________________
Kelly Johnson
San Jose, CA
RV-9A
Pink slip issued: 5/7/12
First flight: 5/28/12, Memorial Day.
Phase I Complete: 8/18/12!
2020 donation: complete
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07-03-2012, 09:32 PM
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Join Date: Jun 2006
Location: San Jose, CA
Posts: 1,125
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Quote:
Originally Posted by DFlyer
A couple of comments. First, is that with the compass mounted in a magnetically clean area, and calibrated, it should be very accurate. And second, do you have a sliding canopy? If so, then you need to calibrate with the canopy slid forward. The frame of the canopy will magnetically interfere with the compass calibration when it is slid back.
-Robert
Dynon Marketing
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Robert
I think you're on to something here. I finally got out to the airport tonight and found out that the compass swings 30+ degrees between canopy open and closed!
Now I have to figure out how to keep my charts from blowing out when I fly with the canopy open! 
__________________
Kelly Johnson
San Jose, CA
RV-9A
Pink slip issued: 5/7/12
First flight: 5/28/12, Memorial Day.
Phase I Complete: 8/18/12!
2020 donation: complete
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07-09-2012, 07:54 PM
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Join Date: Jun 2006
Location: San Jose, CA
Posts: 1,125
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Just a follow up. I calibrated yesterday with the canopy closed and the crazy winds aloft have gone away! Who knew this would have an effect on the weather!!
Thanks for the help everybody.
__________________
Kelly Johnson
San Jose, CA
RV-9A
Pink slip issued: 5/7/12
First flight: 5/28/12, Memorial Day.
Phase I Complete: 8/18/12!
2020 donation: complete
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