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  #1  
Old 06-16-2017, 05:21 AM
todehnal todehnal is offline
 
Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 848
Default Skyview Screen Shutter Flutter

I call it "Shutter Flutter" because it reminds me of some old film strip movies where your eye catches the frames advance which gave them a flutter effect. At cruise I can detect a very slight screen flutter on my Skyview. It is more noticeable in the background on the primary display area, and it appears to be cycling somewhere in the 8 Hz area. Interestingly, I don't see it at idle. I have watched some of the in flight training videos that Kirk from Dynon made and noted that there was no flutter, of course he is not flying an RV-12. So, I thought that it may be unique to my installation, but I just viewed a youtube video of a Skyview display in a flying RV-12 and I noticed similar flutter. It is not a serious distraction, but I sure would like to identify the cause. Now I am thinking that this may be common to the RV-12. Is anyone else experiencing this, or do I have a unique problem?

Thanks.........Tom
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2013- RV12, Kit #119. N123M First flight Nov21. It's a keeper!
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1989- RV-6 tail kit, built and sold
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  #2  
Old 06-16-2017, 05:57 AM
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tomkk tomkk is offline
 
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Location: Port Orange, Fl
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I've got almost 300 hrs on my -12 and I haven't noticed anything like that. I'll specifically look for it next time out ...
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  #3  
Old 06-16-2017, 07:14 AM
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Jesse Jesse is offline
 
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Location: X35 - Ocala, FL
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I have never seen this, even in an RV-12 with Skyview. I wonder if it is voltage/installation related.
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  #4  
Old 06-16-2017, 07:54 AM
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bkervaski bkervaski is offline
 
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Location: Birmingham, Alabama
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Just going to throw this out there .. random thought .. are you perhaps viewing through polarized sunglasses? They can cause the effect you are describing on some displays.
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Last edited by bkervaski : 06-16-2017 at 07:57 AM.
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  #5  
Old 06-16-2017, 09:05 AM
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DaleB DaleB is online now
 
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Location: Omaha, NE (KMLE)
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How's your interior painted? Could it be a strobing effect caused by sunlight either passing through or reflecting off of your prop, then reflecting off the interior paint?

Alternatively, it's not too much of a stretch to imagine a vibration issue with the backlight driver board.
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  #6  
Old 06-16-2017, 12:13 PM
todehnal todehnal is offline
 
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Location: Kentucky Lakes area in KY
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This is a very subtle shutter effect. It is not even particularly annoying, other than concern as to what is causing it. I only detect it by fixing my view on the horizon line on the display, but it is there. I don't wear polarized glasses,and it is not a reflection from anything that I can detect. On my next flight I will see if I can determine more accurately the RPM range where it becomes apparent and report back. As always I greatly appreciate the input from you guys.

Tom
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1998- RV-9 tail kit, built and sold
1989- RV-6 tail kit, built and sold
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  #7  
Old 06-16-2017, 12:28 PM
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drill_and_buck drill_and_buck is offline
 
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Location: Bridgewater, MA - KPYM
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FWIW I have seen a few unusual screen behaviours on the D-100 series that were caused by bad grounds to EMS sensors. However, they were isolated to specific section of the screen. What you described sound more like what you would see on your computer screen at home if you set the refresh rate below 60mhz (which can be very annoying).

If not already, I would check with Dynon. Unless it's a know software or hardware issue they will most likely tell you to check all connections.

Let us know what you find out.
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  #8  
Old 06-16-2017, 03:24 PM
alexe alexe is online now
 
Join Date: May 2013
Location: Temecula, CA
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To see if its noise on the incoming power, just turn off the master and let the Dynon run off of the backup battery. If the problem goes away, you know where to look next. If not, call Dynon for further ideas.
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  #9  
Old 06-16-2017, 04:46 PM
n233va n233va is offline
 
Join Date: Jul 2014
Location: Prescott, AZ
Posts: 18
Angry

Do Not turn master switch off with engine running unless a real emergency. See RV12 POH.
Date: 06/14/16 Revision:5
GENERAL
This section covers the recommended procedures to follow during emergency and adverse flight conditions. As it is not possible to define every type of emergency that may occur, it is the pilot’s responsibility to use sound judgment based on personal experience and knowledge of the aircraft to determine the best course of action.
It is considered mandatory that the pilot be familiar with this entire manual, in particular, the “Emergency Procedures” section prior to flight.
W ARNING
Do not turn off the Master switch with the engine running
except in an EMERGENCY situation.
Running the engine with the Master Switch off may damage the voltage regulato
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  #10  
Old 06-16-2017, 09:39 PM
alexe alexe is online now
 
Join Date: May 2013
Location: Temecula, CA
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OK then, pull the fuse feeding the Dynon.
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