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NACA duct and overhear vents

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aireupora(at)sbcglobal.ne
Guest

Posted: Sat Jun 27, 2009 9:21 am Post subject: NACA duct and overhear vents

I'm trying to figure out the best place to place my rear NACA duct for the overhead ventation system.  N55XL has it behind the rear bulkhead and the duct system requires a lot of work in getting to it.  I'd like to see if somebody has a simple solation.

 [quote][b]

fklein(at)orcasonline.com
Guest

Posted: Sat Jun 27, 2009 11:40 am Post subject: NACA duct and overhear vents

On Jun 27, 2009, at 10:17 AM, Rick Stockton wrote:

 	  Quote: 	
		  I'm trying to figure out the best place to place my rear NACA duct for the overhead ventation system.  N55XL has it behind the rear bulkhead and the duct system requires a lot of work in getting to it.  I'd like to see if somebody has a simple solation.

	




Rick...John Wigney has a simple and straightforward solution...

John?   How 'bout some pixs?

Fred

A194

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nwcmc(at)tiscali.co.uk
Guest

Posted: Sun Jun 28, 2009 8:25 am Post subject: NACA duct and overhear vents

Don’t bother with a NACA duct it won’t work. That area of the aircraft is in a low pressure area. Others have tried and failed. What does work is an outward opening flap. When wide open is provides ample cooling from prop wash. When airborne only about ¼ - ½ inch opening is required. This creates negligible drag and sufficient flow. It is important to reinforce the area of cut-out as this part of the aircraft is strength critical. I wrote up a modification for this which has been used on at least two Europas.  

   

Nigel Charles  

   

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budyerly(at)msn.com
Guest

Posted: Sun Jun 28, 2009 11:19 am Post subject: NACA duct and overhear vents

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Rick,

 The best and easiest for South Florida in the summer is the ultimate  ventilator, sold through aircraft spruce.

             ULTIMATE VENTILATOR     05-04090     $95.75      

 Dumb simple to install with a little redux.  you can polish the metal  to a shine or paint, or leave it alone.

  

 Gary Stowt put his in the glass about 2 inches above the lower edge of the  side of the windscreen, I put mine in the fiberglass below the windscreen  (didn't want to screw with the glass), about midway between the panel and the  canopy bow.

  

 I just flew an hour and a half at 95F, in the sun in fingertip formation  during a photo shoot in Baker's motorglider, and I had no problems with  airflow.  Rain does come in though in-flight if it is heavy rain.

  

 Otherwise the Europa provided vents are marginal at best.  

  

 Please provide some kind of exit air for your cockpit, because if you build  it tight, the air can't get in.  I had to put extensions on the D panel to  get air out of the cockpit.  Some use vents from building supply stores,  others have large holes in their cockpit modules that naturally vent the  cockpit.

  

 Bud Yerly

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topglock(at)cox.net
Guest

Posted: Sun Jun 28, 2009 2:40 pm Post subject: NACA duct and overhear vents

Nigel and all,



If Rick is talking about N55XS (Baby Blue) the NACA vent, on the 

starboard side of the vertical fin does, indeed provide lots of air to 

the cockpit.  The duct work is a little bothersome, is one builds hard 

ducts into the airframe, as I did, however, SCAT tube can be 

substituted, very easily.  I'd be happy to demonstrate the airflow to 

anyone wishing to take a ride... 



Jeff - Baby Blue



nigel charles wrote:

[quote] Don’t bother with a NACA duct it won’t work. That area of the aircraft 

 is in a low pressure area. Others have tried and failed. What does work 

 is an outward opening flap. When wide open is provides ample cooling 

 from prop wash. When airborne only about ¼ - ½ inch opening is required. 

 This creates negligible drag and sufficient flow. It is important to 

 reinforce the area of cut-out as this part of the aircraft is strength 

 critical. I wrote up a modification for this which has been used on at 

 least two Europas.

 

  

 

 Nigel Charles

 

  

 

 --

fklein(at)orcasonline.com
Guest

Posted: Sun Jun 28, 2009 4:12 pm Post subject: NACA duct and overhear vents

On Jun 28, 2009, at 3:38 PM, Jeff B wrote:



 	  Quote: 	
		   If Rick is talking about N55XS (Baby Blue) the NACA vent, on the  

 starboard side of the vertical fin does, indeed provide lots of air  

 to the cockpit.  The duct work is a little bothersome, is one builds  

 hard ducts into the airframe, as I did, however, SCAT tube can be  

 substituted, very easily.


	


Jeff,



Did you use an after-market NACA vent?  What size SCAT would you  

suggest? And how did you enter the plenum between the doors, given the  

reinforcement  between the doors called for in the plans?



Fred



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jimpuglise(at)comcast.net
Guest

Posted: Sun Jun 28, 2009 5:43 pm Post subject: NACA duct and overhear vents

Fred- 

  

We did mine up at Flight Crafters and they do them all about the same.  We have the NACA vent on the starboard side of the fin, just like Jeff.  When we installed it, we bonded the basket from a stainless steel tea strainer to the back to keep bugs from nesting.  The NACA vent we used has a 2" output.  We ran 2 inch SCAT tubing forward and used 3/4 X 4 blue foam as a mold to make a 3 sided piece of tubing about 4 feet long that mates to the SCAT tubing just aft of the "D" brace and runs along the ceiling to the back of the overhead in the cockpit.  We use two VERY LARGE eye vents, one forward and one aft, from SteinAir (AV-1.625B) in the headliner.  They are quite expensive, about $ 100 each, and I had to cut them down to fit.  However, Lynne gets even meaner than usual if she can't get a lot of fresh air, so they are an investmen in keeping the peace.  How do they work?  Tell you after I have it flying.  If you need them, I have pictures.  

  

Jim Puglise A-283   

  



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fklein(at)orcasonline.com
Guest

Posted: Sun Jun 28, 2009 6:42 pm Post subject: NACA duct and overhear vents

On Jun 28, 2009, at 6:38 PM, jimpuglise(at)comcast.net (jimpuglise(at)comcast.net) wrote:

 	  Quote: 	
		   We ran 2 inch SCAT tubing forward and used 3/4 X 4 blue foam as a mold to make a 3 sided piece of tubing about 4 feet long that mates to the SCAT tubing just aft of the "D" brace and runs along the ceiling to the back of the overhead in the cockpit. 	




Jim,

What I'm not getting is how your 3/4 x 4 duct gets past the "top hat stiffeners" between the door openings shown on Fig. 1 on p. 23-1 of the build manual. Simply penetrating the stiffeners doesn't seem right as their purpose appears to be to provide structural continuity.

Fred 



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jimpuglise(at)comcast.net
Guest

Posted: Mon Jun 29, 2009 6:18 am Post subject: NACA duct and overhear vents

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topglock(at)cox.net
Guest

Posted: Mon Jun 29, 2009 6:56 am Post subject: NACA duct and overhear vents

Fred,



Go to http://www.n55xs.com and check in the June 2004 logs.  Everything 

is there...



Jeff - Baby Blue



Fred Klein wrote:

 	  Quote: 	
		   

 On Jun 28, 2009, at 6:38 PM, jimpuglise(at)comcast.net 

 <mailto:jimpuglise(at)comcast.net> wrote:

 

>  We ran 2 inch SCAT tubing forward and used 3/4 X 4 blue foam as a 

> mold to make a 3 sided piece of tubing about 4 feet long that mates to 

> the SCAT tubing just aft of the "D" brace and runs along the ceiling 

> to the back of the overhead in the cockpit.

 

 Jim,

 

 What I'm not getting is how your 3/4 x 4 duct gets past the "top hat 

 stiffeners" between the door openings shown on Fig. 1 on p. 23-1 of the 

 build manual. Simply penetrating the stiffeners doesn't seem right as 

 their purpose appears to be to provide structural continuity.

 

 Fred 

 

 

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 This message has been scanned for viruses and

 dangerous content by *MailScanner* <http://www.mailscanner.info/>, and is

 believed to be clean.

 

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frans(at)paardnatuurlijk.
Guest

Posted: Mon Jun 29, 2009 9:44 am Post subject: NACA duct and overhear vents

Fred Klein wrote:



 	  Quote: 	
		   Did you use an after-market NACA vent?  What size SCAT would you

 suggest? And how did you enter the plenum between the doors, given the

 reinforcement  between the doors called for in the plans?


	


I made a small air door in the ceiling (between the doors), so it is

flush with the roof when closed, and forms a small forward scoop when

opened. It is directly connected to two eye-ball vents in the ceiling panel.



I have not yet been flying, but even with the engine on idle, the vents

already produce lots of air. I suspect that these things produce a real

blaze at cruise speed.



It is a simple solution, and I can't really see the advantage of taking

the air from the rear of the airplane and then transporting it all the

way to the intended place. Also, when taking air from the rear of the

plane, it might be mixed with some exhaust fumes (probably depending on

the amount of prop wash, speed and angle of attack). It is however very

unlikely that the exhaust fumes get to the roof of the airplane in any

normal flight configuration.



Of course if you make an opening in the roof, don't make it too big.

According to the air it produces with an engine on idle, you don't need

much of an opening there. I made a flange around the opening, doing

double duty as reinforcement around the opening, and forming a rain

proof seal when the scoop is closed.



-- 

Frans Veldman

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