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Avionics cooling

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coop85(at)bellsouth.net
Guest

Posted: Sun Aug 27, 2006 12:17 pm Post subject: Avionics cooling

I have 12 hours on the RV-10 and for the most part all is going well.  I

have a fairly warm tunnel that I'll apply the techniques offered here to

fix.  I have two other issues I'll address in separate messages.



My avionics are getting REALLY warm, in fact the DYNON is running really

slow (hit the timer function and it counts up at about 30% normal speed).

What sort of methods are you guys using to keep things under control.  I

remember several comments about computer fans and that seems like a good

idea.  I also considered running a blast tube off the ventilation scoop and

direct fresh, cool air behind the panel at a slight loss to passenger

comfort.



Thanks,

Marcus



Do not archive

ScooterF15

Joined: 19 Jun 2006
Posts: 136

Posted: Sun Aug 27, 2006 1:00 pm Post subject: Avionics cooling

Marcus,

  

 I have a transponder that is overheating. As a temporary fix, I did exactly  what you mentioned. I connected a piece of scat tubing to the passenger vent  with a hose clamp and pointed it up toward the stack under the panel.  Incidentally, I have been able to keep passengers happy in hot weather  by pointing the left side vent across the cockpit.

  

 As a more permanent fix I plan on installing some strategically mounted  computer fans.

  

 Jim

  

  

 In a message dated 8/27/2006 4:19:54 P.M. Eastern Daylight Time,  coop85(at)bellsouth.net writes:

  	  Quote: 	
		  -->    RV10-List message posted by: "Marcus Cooper"    <coop85(at)bellsouth.net>



I have 12 hours on the RV-10 and for the    most part all is going well.  I

have a fairly warm tunnel that I'll    apply the techniques offered here to

fix.  I have two other issues    I'll address in separate messages.



My avionics are getting REALLY warm,    in fact the DYNON is running really

slow (hit the timer function and it    counts up at about 30% normal speed).

What sort of methods are you guys    using to keep things under control.  I

remember several comments about    computer fans and that seems like a good

idea.  I also considered    running a blast tube off the ventilation scoop and

direct fresh, cool air    behind the panel at a slight loss to    passenger

comfort.



Thanks,

Marcus



Do not    es  Day       -->                - NEW MATRONICS WEB FORUMS -

bsp;    -->  nbsp;                - NEW MATRONICS LIST WIKI -

_-=  ;  p;               - List Contribution Web Site  ;                             =========================



	


 

  

  [quote][b]

jesse(at)itecusa.org
Guest

Posted: Sun Aug 27, 2006 5:47 pm Post subject: Avionics cooling

We have installed an AmeriKing cooling fan 3 or 5 ports with lines running

to the back of the radio stack, but nothing for the Dynons.  Haven't had any

problems.  Do you have a way of checking the temp at specific places behind

the instrument panel to make sure it is heat that is causing the problem in

the Dynon?  I would agree that running a decent sized hose from the right

side air vent to somewhere behind the panel for a flight might narrow down

the possible problems.



Do not archive.



Jesse Saint

I-TEC, Inc.

jesse(at)itecusa.org

www.itecusa.org

W: 352-465-4545

C: 352-427-0285



--

coop85(at)bellsouth.net
Guest

Posted: Sun Aug 27, 2006 6:09 pm Post subject: Avionics cooling

I think I'll order the cooling fan as well, probably should have done that

from the start but it didn't even occur to me.



One detail I didn't include on the Dynon, it actually did it's "I'm really

getting hot here" trick where it turns grayscale and says the temp is too

hot.  I'll try ducting some air short term while the various fans show up.



Thanks,

Marcus



Do not archive



--

Tim(at)MyRV10.com
Guest

Posted: Sun Aug 27, 2006 6:37 pm Post subject: Avionics cooling

Marcus,



I got a 3 output avionics cooling fan too.  It's probably a

worthwhile investment.



Tim Olson - RV-10 N104CD - Flying

do not archive

Marcus Cooper wrote:

[quote] 

 

 I think I'll order the cooling fan as well, probably should have done that

 from the start but it didn't even occur to me.

 

 One detail I didn't include on the Dynon, it actually did it's "I'm really

 getting hot here" trick where it turns grayscale and says the temp is too

 hot.  I'll try ducting some air short term while the various fans show up.

 

 Thanks,

 Marcus

 

 Do not archive

 

 --

Ray.R.Doerr(at)sprint.com
Guest

Posted: Mon Aug 28, 2006 8:56 am Post subject: Avionics cooling

I have the 3 port ameriking fan which connects to both 430's and the transponder, but both of my Dynon's (small versions) don't have any cooling and I've found that in the hot sun while flying the EFIS which is mounted at the top of the panel is alarming with high internal temp and the screen changes to a gray scale instead of the normal color screen.  In working with Dynon, they said it will still function but is outside the temperature limits in which they calibrated the unit, so it may not be as accurate.

Thank You

Ray Doerr

--

Tdawson(at)avidyne.com
Guest

Posted: Mon Aug 28, 2006 9:00 am Post subject: Avionics cooling

Hmm. An EFIS that is "outside the temperature limits . . . so it may not

be as accurate " - that's kind of scary.



TDT

40025

--

jaybrinkmeyer(at)yahoo.co
Guest

Posted: Tue Aug 29, 2006 9:15 am Post subject: Avionics cooling

I'll byte... What sort of "avionics" fan are you guys referring to and where

does one get one? I'm guessing Spruce (like everything else), but I haven't

looked. 



Anyone know if Dynon is using mil-spec parts? How about gluing on a heat sink?

Seems like the Dynon engineering department might be interested in real world

feedback.



Does anyone have photos of where they are mounted said fans?



Thanks,

Jay

looking forward to bending fuse skins - not!



__________________________________________________

Tim(at)MyRV10.com
Guest

Posted: Tue Aug 29, 2006 9:51 am Post subject: Avionics cooling

Jay Brinkmeyer wrote:

 	  Quote: 	
		   

 

 I'll byte... What sort of "avionics" fan are you guys referring to and where

 does one get one? I'm guessing Spruce (like everything else), but I haven't

 looked. 

 


	


This is the one I got:

http://www.steinair.com/accessories.htm



You may not want to deal with Stein though....he's too nice for

most people.  Try to find someone who'll treat you a little

worse. 



 	  Quote: 	
		   Anyone know if Dynon is using mil-spec parts? How about gluing on a heat sink?

 Seems like the Dynon engineering department might be interested in real world

 feedback.

 

 Does anyone have photos of where they are mounted said fans?

 


	


I mounted mine on one of the vertical ribs, forward of the subpanel.



Tim Olson - RV-10 N104CD - Flying 116 hours

do not archive



 	  Quote: 	
		   Thanks,

 Jay

 looking forward to bending fuse skins - not!

rvbuilder(at)sausen.net
Guest

Posted: Tue Aug 29, 2006 9:54 am Post subject: Avionics cooling

Yep Spruce.  It's a multi port fan that you can hook SCAT tube to.  Not

overly expensive either.



Michael Sausen 



--

LIKE2LOOP(at)aol.com
Guest

Posted: Tue Aug 29, 2006 1:24 pm Post subject: Avionics cooling

In a message dated 8/29/2006 5:15:07 PM Eastern Standard Time,  jaybrinkmeyer(at)yahoo.com writes:

  	  Quote: 	
		  What    sort of "avionics" fan are you guys referring to and where

does one get    one? I'm guessing Spruce (like everything else), but I haven't

looked.    

Anyone know if Dynon is using mil-spec parts? 	


 

     Dont you all have a "large fan" out front already  running every time the avionics are used?  Why add more electrical  components with failure potential, just run an air line off the vent to  pass air over the back of the avionics???  Ambient air is all the same  temp..... acutally a fan my just circulate hot air from under the panel???

  

 DO NOT ARCHIVE

  

 Steve  

Stephen  Blank              #40499 

766 SE River Lane

Port St. Lucie, FL 34983



772-475-5556  cell - evenings and weekends



  [quote][b]

Tim(at)MyRV10.com
Guest

Posted: Tue Aug 29, 2006 1:48 pm Post subject: Avionics cooling

Moisture.

Tim Olson - RV-10 N104CD - Flying

do not archive

LIKE2LOOP(at)aol.com wrote:

 	  Quote: 	
		   In a message dated 8/29/2006 5:15:07 PM Eastern Standard Time, 

 jaybrinkmeyer(at)yahoo.com writes:

 

     What sort of "avionics" fan are you guys referring to and where

     does one get one? I'm guessing Spruce (like everything else), but I

     haven't

     looked.

     Anyone know if Dynon is using mil-spec parts?

 

     Dont you all have a "large fan" out front already running every time 

 the avionics are used?  Why add more electrical components with failure 

 potential, just run an air line off the vent to pass air over the back 

 of the avionics???  Ambient air is all the same temp..... acutally a fan 

 my just circulate hot air from under the panel???

  

 DO NOT ARCHIVE

  

 Steve

 

 Stephen Blank             #40499

 766 SE River Lane

 Port St. Lucie, FL 34983

 

 772-475-5556 cell - evenings and weekends

coop85(at)bellsouth.net
Guest

Posted: Tue Aug 29, 2006 4:09 pm Post subject: Avionics cooling

Exactly, the last time I flew through rain I was really glad I didn't pipe

the air up into my avionics.  I didn't get soaked, but there was no doubt

water was happy to press right in the ventilation scoops.

One other thought I had was to draw air from above the glare shield by.  The

shield itself is hot, but the air just above seems pretty reasonable.  I

also had a plan to set the switch up to reverse polarity and then I could

turn it into a defog like some guys have done.  Some loss in efficiency

running the blades backwards, but it would be better than nothing.

Thoughts???



Marcus

40286 - flying, still testing



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