REFLECTOR: Louvers

[Tom Falls]

Is www.tvbf.org down?   I get URL not valid when I try it.

 

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Jeff Barnes
Sent: Sunday, October 31, 2010 10:33 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Louvers

 


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_prudhom
me%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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