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  #1  
Old 10-31-2021, 09:50 AM
georgemohr georgemohr is offline
 
Join Date: Aug 2021
Location: Ewing Township
Posts: 35
Default Defrost fan or avionics cooling fan... or both?!

Hi all,

The two fans that Vans specifies in the top of the glare shield.. are they intended to be defog for the canopy, or are they for cooling the avionics bay? And if they are only for defrosting, is there any "always on" cooling for avionics that folks have implemented?


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George
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  #2  
Old 10-31-2021, 10:00 AM
Ron B. Ron B. is offline
 
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Location: Yarmouth, Nova Scotia
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defrost only, most displays have their own cooling fan.
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  #3  
Old 10-31-2021, 10:02 AM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
Posts: 2,737
Default fans

I built a -10. The fans help keep the avionics area cool and yes, they will help to remove fog on the windshield...I think defrost might be a bit strong.

You may want to put a speed control, or at least a switch on the fans. I have found that on high, the air is directed back into my face...
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  #4  
Old 10-31-2021, 11:21 AM
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wcalvert wcalvert is online now
 
Join Date: Jan 2019
Location: Anacortes Wa
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Default

My -7 has four small computer cooling fans (1 3/4") across the span of the glare shield.

Originally I put them in to provide some defog and cooling air to my boxes underneath.

Now I find that one of the biggest benefits is that they distribute the hot air from the heater air inlet near my feet all around the cabin. Air rises up behind the dash and gets blown all around. Triple bonus.

The system has a speed control, but it's hidden below the dash (it is accessible in flight if needed) and controlled by a single on/off switch.

Good stuff
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  #5  
Old 10-31-2021, 09:46 PM
mr.sun mr.sun is offline
 
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Location: Wet, Western Washington
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Bill, do you have photos of your fans? My -7 needs de-fog fans as well.
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  #6  
Old 10-31-2021, 10:50 PM
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wcalvert wcalvert is online now
 
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Greg, can take some tomorrow and post ... stay dry this week!
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  #7  
Old 11-01-2021, 12:35 AM
SantosDumont SantosDumont is offline
 
Join Date: Sep 2019
Location: Henderson, NV
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I was in 214VA this week and actually needed to defrost the canopy. The fans were pretty ineffective. Using a towel to wipe off the condensation had immediate results.

I’m glad I experienced it though ao I can think about how to improve the design.
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  #8  
Old 11-01-2021, 01:53 PM
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wcalvert wcalvert is online now
 
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Default Fan pics ...

Greg, here are the promised pics of the fans on my -7.
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  #9  
Old 11-01-2021, 02:29 PM
rockwoodrv9 rockwoodrv9 is offline
 
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Location: Meridian ID, Aspen CO, Okemos MI
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I had fog in my cabin today too. That is a first for me. I opened the tip up canopy to taxi position and it cleared pretty fast. I may have to install a couple fans like in Bill's pictures. It is a bit freaky to think what could happen if it fogged up in flight.
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Old 11-01-2021, 04:08 PM
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Steve Melton Steve Melton is offline
 
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several yrs ago around Cleveland on a rainy Fall day I had a fogged over windshield on the ground and kept wiping it with a towel during taxi. after takeoff it all cleared, quickly.
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