REFLECTOR: Louvers

[Brian Michalk]

I had a disk fail on me last night.

It looks like restoring backups from now to about a year ago are not 
going to happen.

On 11/01/2010 10:12 AM, Tom Falls wrote:
>
> 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_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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