REFLECTOR: Louvers

nmflyer1 at aol.com nmflyer1 at aol.com
Mon Nov 1 21:25:14 CDT 2010


My exits are similar. I have one underneath (right behind the lower radiator & oil pan) and 2 on top that are smaller (behind the upper NACA's and aft of the fuel rails). 

Kurt 






-----Original Message-----
From: Scott Derrick <scott at tnstaafl.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Mon, Nov 1, 2010 5:21 pm
Subject: Re: REFLECTOR: Louvers


This looks really interesting!   Simple and easy to do.  I see that this extra outlet is in addition to the standard side by side exits next to the prop spinner.

I like this.

Scott


-------- Original Message --------
Subject: Re: REFLECTOR: Louvers
From: Jeff Barnes <jcbarnes411 at sbcglobal.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Date: 10/31/2010 08:33 PM



Hi Scott,
 
     Look at this from Jean Prudhomme.  Jean was among first to implement the top cooling ducts/NACAs. The big hole is to exit cooling air.  Worked as far as I can recollect.
 
http://www.tvbf.org/gallery/index.php?display=engines%2Fexhaust_jean_prudhomme%2Fjp_exhaust_1.jpg
 
 
     The picture series was to show his improved exhaust.    
 
 
Regards,
 
Jeff Barnes 

--- On Sun, 10/31/10, Scott Derrick <scott at tnstaafl.net> wrote:


From: Scott Derrick <scott at tnstaafl.net>
Subject: REFLECTOR: Louvers
To: reflector at tvbf.org
Date: Sunday, October 31, 2010, 7:38 PM


Still trying to get my CHT's down where I like them.  I consider 400-410 in cruise TDH.

I've been thinking about the exit for the cooling air. I've got a fairly large engine in a fairly small cowling,  IO520 in a STD cowl. I did enlarge the aft end of the cowl a bit but just enough to barely clear the plenum on top and the right hand exhaust tube(#6) on the bottom. I've been thinking maybe I have restricted the airflow out of the engine compartment?  As I understand air cooling its all about differential pressures between the top and the bottom.

I then started thinking of putting a cowl flap in the bottom cowl, right in the middle.  I sketched it onto the cowl and was trying to figure out the hinging on a curved surface, how much movement woudl be needed etc..  I was planning on making the door and at first just bolting it on in the full open position to see how that worked, If I saw a dramatic decline in temps I could then install an electric actuator of some kind to operate it from the cabin.

Then somebody mentioned a set of fixed louvers? You see them all over Cessna's and Beech's.

Has anybody installed a set of fixed louvers in the bottom cowl and had it improve their cooling?  Maybe a set below each side of jugs?

Scott

-- It is with our passions, as it is with fire and water, they are good servants but bad masters.
Aesop

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