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CJ Fresh Air - NACA ducts for a CJ

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ChangDriver

Joined: 15 Sep 2007
Posts: 266

Posted: Thu Aug 21, 2008 1:46 pm Post subject: CJ Fresh Air - NACA ducts for a CJ

I hear BJ Kennamore put NACA ducts on his CJ to increase the fresh air flow into the cockpit.  If BJ is on the list, I'd like to see pics and get a report of the improved airflow.



It this better than adding a blast tube (from the gills) and feeding the cockpit?



Craig

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ronwasson

Joined: 05 Sep 2007
Posts: 30

Posted: Thu Aug 21, 2008 2:42 pm Post subject: CJ Fresh Air - NACA ducts for a CJ

I put a reverse scoop on fuel drain panel to create low pressure under  

the belly tank. I assume most of the fumes are coming from the tail  

cone as that is where reports of acro smoke starts to come from. There  

is no way seal the tail cone short of a high dollar bulkhead. The  

scoop creates low pressure to give it a place to go out side. It is  

not fix but the gauge shows  it seems to help by half on landing and a  

third at cruise. My glass guy made one in a day and still has the  

form. I turned it around for high pressure and it made it worst on the  

meter not better.  No mod to the plane.  I could not tell a difference  

but a friend with lung problems said otherwise.

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vectorwarbirds(at)aol.com
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Posted: Thu Aug 21, 2008 5:02 pm Post subject: CJ Fresh Air - NACA ducts for a CJ

Unless the duct is drawing totally clean air , as from the front of the aircraft or way out on the wing you are never going to get rid of the C02. If you are sucking dirty air through the cockpit you are still breathing it.  That stuff is coming in from every nook and crack on the CJ.   I put a flange on the air compressor cooling inlet and brought in fresh air from there, totally clean and plenty for both cockpits

 

 Tally Ho!

 

 Bunndini  

 

   

 

   

 

 --

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