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Dynon Skyview Airspeed Calibration...

 
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Matt Dralle
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Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA

PostPosted: Mon Dec 26, 2011 7:42 pm    Post subject: Dynon Skyview Airspeed Calibration... Reply with quote

Dear Listers,

I've been flying the new 10" Dynon Skyview in the RV-6 for a few weeks now and it seems like the airspeed is reading maybe 10mph fast. The GS always reads 10mph or more slower than the True airspeed, no matter which way I fly with respect to the current wind. Looking through the configuration options on the Skyview, I'm not seeing parameters to calibrate the airspeed. If the airspeed were *slow* compared to the GS, I could envision making adjustments to the Pitot tube to get it in better alignment with slipstream. But *fast* is a head scratcher. If there's no electronic configuration parameters to adjust, what do you do? Are there Pitot line "attenuators" like for RF in coax? Wink

Matt
-
Matt "Red Dawg" Dralle

RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 170+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...

RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 42+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode


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Matt Dralle
Site Admin


Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA

PostPosted: Tue Dec 27, 2011 9:16 pm    Post subject: Dynon Skyview Airspeed Calibration... Reply with quote

At 07:39 PM 12/26/2011 Monday, Matt Dralle wrote:
Quote:
Dear Listers,

I've been flying the new 10" Dynon Skyview in the RV-6 for a few weeks now and it seems like the airspeed is reading maybe 10mph fast. The GS always reads 10mph or more slower than the True airspeed, no matter which way I fly with respect to the current wind. Looking through the configuration options on the Skyview, I'm not seeing parameters to calibrate the airspeed. If the airspeed were *slow* compared to the GS, I could envision making adjustments to the Pitot tube to get it in better alignment with slipstream. But *fast* is a head scratcher. If there's no electronic configuration parameters to adjust, what do you do? Are there Pitot line "attenuators" like for RF in coax? Wink

Matt

Listers,

Thank you for all the great suggestions on resolving this airspeed issue! I took a look at the static ports on the RV-6 today and found that they are done using a flush head screw with a hole drilled in the center on either side of the fuselage. They do *not* protrude from the side of the plane at all. They are totally flush (see attached picture). Just for fun, I whipped up a couple of quick test deals using a 3/16" washer and some electrical tape. I poked a 1/16" hole in the center of the tape and then put the washer centered over the static ports on both sides of the fuselage (see attached pictures). Then, I went flying on this beautiful December 27 day in California!

I didn't have time to do any real scientific multi-leg testing, but I was amazed that the True Airspeed is now falling in a much more believable range compared to the GPS-derived ground speed. On one cross-country leg, I had an exactly 90 degree crosswind component and the True Airspeed and GPS Ground Speed were tracking exactly the same. Yahoo!

Obviously I need to do some additional, more scientific measurements and probably come up with a slightly more "permanent" washer arrangement, but the early returns are very promising! Smile

Thanks again for all the great feedback!

Matt
-
Matt "Red Dawg" Dralle

RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 170+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...

RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 42+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode


- The Matronics RV7-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Matt Dralle
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Matt Dralle
Site Admin


Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA

PostPosted: Thu Dec 29, 2011 7:36 pm    Post subject: Dynon Skyview Airspeed Calibration... Reply with quote

At 07:39 PM 12/26/2011 Monday, you wrote:
Quote:
--> RV-List message posted by: Matt Dralle <dralle(at)matronics.com>

Dear Listers,

I've been flying the new 10" Dynon Skyview in the RV-6 for a few weeks now and it seems like the airspeed is reading maybe 10mph fast. The GS always reads 10mph or more slower than the True airspeed, no matter which way I fly with respect to the current wind. Looking through the configuration options on the Skyview, I'm not seeing parameters to calibrate the airspeed. If the airspeed were *slow* compared to the GS, I could envision making adjustments to the Pitot tube to get it in better alignment with slipstream. But *fast* is a head scratcher. If there's no electronic configuration parameters to adjust, what do you do? Are there Pitot line "attenuators" like for RF in coax? Wink

Matt


Listers,

I went flying tonight in the RV-6 around sunset and took some airspeed numbers flying the four points of the compass. I let each direction normalize for about 2 minutes before taking the readings. I've still got my little black-tape washer deals on the static ports that I detailed in a previous email.

Do these numbers make any sense?

I set the altimeter to 30.15 (KLVK ATIS). I compared the Dynon altitude with the Garmin 696 GPS altitude. The Dynon was high by 100 ft. I used the Dynon altitude adjustment to set it to match the GPS (-100ft). The readings above were after this adjustment.


-
Matt "Red Dawg" Dralle

RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...

RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 48+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode


- The Matronics RV7-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV7-List



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