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Avionics cooling Fan

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trigo(at)mail.telepac.pt
Guest

Posted: Sat May 26, 2007 3:08 am Post subject: Avionics cooling Fan

 	  Quote: 	
		  

   Go with a 12v fan.


	


Speaking of avionics cooling fans, I already bought one from ACS but I 

didn't installed it yet.

It has 3 port, which I will direct one to the EFIS, other to the center 

avionics stack ( COMM, TXPD and GPS) and the third to several electronic 

boards mounted behind the panel.

Whilst planning its installation, I still didn't decide how to switch power 

to it:



   - should it have a dedicated "manual" On/Off switch?

   - or, would it be better to hook it up to the Avionics master switch 

(yes, I have one, please don't discuss this subject now)? This way the fan 

will be turned On whenever I turn On the Avionics master switch..

  - or, what I believe it would be the best way, i.e to install a 

thermostatic switch, which would turn On the fan whenever the air 

temperature behind the panel gets too hot .



In this last solution, where can I find a thermostatic switch? And what 

should be that temperature limit?



Comments and suggestions appreciated !



Carlos Trigo

RV-9A

wgill10(at)comcast.net
Guest

Posted: Sat May 26, 2007 5:00 am Post subject: Avionics cooling Fan

Hello Carlos,



I purchased the AmeriKing 3-port cooling fan from ACS, but returned it

due to its bulky size and the limited area I had for mounting such in an

IFR 

RV-7. I settled on the 3-port Cyclone fan from ACS which is lighter and

about 1/3 the size of the AmeriKing unit.



I do not have an avionics master or the E-buss, so I installed a panel

mounted switch for the avionics cooling fan to allow load shedding if

the alternator drops off line. My EFIS has an internal back-up battery

and all other panel electronics are controlled by the unit power switch

or a panel mounted switch.



Connecting the cooling fan to the avionics master (main buss) seems like

a good plan, but I would not put it on the E-buss if you incorporated

such.



Bill

RV-7 finishing

Lee's Summit, MO

--

nuckollsr(at)cox.net
Guest

Posted: Sat May 26, 2007 6:11 am Post subject: Avionics cooling Fan

At 12:05 PM 5/26/2007 +0100, you wrote:



 	  Quote: 	
		  

<trigo(at)mail.telepac.pt>



>

>   Go with a 12v fan.

>



Speaking of avionics cooling fans, I already bought one from ACS but I 

didn't installed it yet.

It has 3 port, which I will direct one to the EFIS, other to the center 

avionics stack ( COMM, TXPD and GPS) and the third to several electronic 

boards mounted behind the panel.

Whilst planning its installation, I still didn't decide how to switch 

power to it:



   - should it have a dedicated "manual" On/Off switch?

   - or, would it be better to hook it up to the Avionics master switch 

 (yes, I have one, please don't discuss this subject now)? This way the 

 fan will be turned On whenever I turn On the Avionics master switch..

  - or, what I believe it would be the best way, i.e to install a 

 thermostatic switch, which would turn On the fan whenever the air 

 temperature behind the panel gets too hot .



In this last solution, where can I find a thermostatic switch? And what 

should be that temperature limit?


	


   Keep it simple. Hot wire it to the e-bus. Any time

   any radio is on, the fan is on.



   Bob . . .



        ----------------------------------------

        ( "Physics is like sex: sure, it may   )

        ( give some practical results, but     )

        ( that's not why we do it."            )

        (                                      )

        (                 Richard P. Feynman   )

        ----------------------------------------

trigo(at)mail.telepac.pt
Guest

Posted: Sat May 26, 2007 7:11 am Post subject: Avionics cooling Fan

Bill



Can you please post the Cyclone fan dimensions and weight difference.

Has it the same blowing capacity of the Ameri-King?



Carlos



P.S. - if I decide for the thermostatic switch, who knows a source for that



---

nuckollsr(at)cox.net
Guest

Posted: Sat May 26, 2007 7:24 am Post subject: Avionics cooling Fan

 	  Quote: 	
		  



Connecting the cooling fan to the avionics master (main buss) seems like

a good plan, but I would not put it on the E-buss if you incorporated

such.


	


    Good thought. Normally, the e-bus has a minimum of radios

    on it and when operating e-bus only, cooling would not be

    expected to be necessary. I agree, the fan should hot

    wire to the main bus.



    Bob . . .

wgill10(at)comcast.net
Guest

Posted: Sat May 26, 2007 11:06 am Post subject: Avionics cooling Fan

Carlos,



The Cyclone has somewhat less airflow than the Ameri-King and I believe

the dimensions are about 4" X 4" X 1.25" with an approximate weight of 6

oz. I don't have the exact figures as I have not yet received the

Cyclone fan - ordered last Friday.



An RV-9 friend was helping me on my project and I told him I was having

trouble finding a suitable location to mount the cooling fan. Of course,

he began identifying many locations...then I showed him the Ameri-King

fan. He then said, "Send it back and get the Cyclone." So, that's what I

did. The figures I gave here were his approximations. I can provide the

exact weight & measurements next week unless someone else on the list

here beats me to it.



Bill

--

trigo(at)mail.telepac.pt
Guest

Posted: Sat May 26, 2007 12:48 pm Post subject: Avionics cooling Fan

Thanks Bill



That is enough for me.

Maybe I should do the same as you, since I concluded (after a search on my 

shelves) that I also have the Ameri-King.

By the way, where did you decide to install your fan ?



Carlos

---

wgill10(at)comcast.net
Guest

Posted: Sat May 26, 2007 1:17 pm Post subject: Avionics cooling Fan

Carlos,



I am mounting the fan on the inside of the left panel rib between the

sub-panel and firewall. There are likely better places, but the full

panel and wiring runs restricted such for my installation.   



I didn't have any trouble returning the Ameri-King to ACS even though I

was outside of their 30-day return period and the unit was still in

"new" condition. They said there may be a 15% restocking fee...we'll

see.



Bill



--

wgill10(at)comcast.net
Guest

Posted: Wed May 30, 2007 2:08 pm Post subject: Avionics cooling Fan

Carlos,



I attached some photos of the Cyclone fan to illustrate its compact

size.



Bill

--

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trigo(at)mail.telepac.pt
Guest

Posted: Wed May 30, 2007 2:55 pm Post subject: Avionics cooling Fan

Thanks Bill



Very nice little critter

Did you already test power it, to hear its noise?



Carlos

---

wgill10(at)comcast.net
Guest

Posted: Wed May 30, 2007 3:13 pm Post subject: Avionics cooling Fan

Yes, no better or worse than others. 



Bill



--

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