[rebel-builders] Cowl

bill lowery · Post by **bill lowery** » Sun Feb 19, 2012 5:49 pm

Please forward pics and info on speed cowl flap. I am right at that point. Thanks

W.D. "Bill" Lowery
Cell: 407-947-5777

ICC General Contractors
3000 W. Osceola Rd.
Geneva, FL 32732

Tel: 407-349-2183
Fax: 407-349-0863

Date: Tue, 17 Nov 2009 07:00:22 -0800
From: aircrafttips@yahoo.com
Subject: Re: [rebel-builders] cowl
To: rebel-builders@dcsol.com

Hi all your Rebel Builders.

I have followed this thread and have some info that might help.

First, I have created a add on panel to the lower Rebel Speed Cowl. The cost is $125.00.
I am not saying anything more on this as I do not like to use this forum for sales. Please E-mail me and I can supply photos and you be the judge.

What this does is lower the cowl about 2 inchs, smooths out the lower cowl, extend past the fire wall and thus creates a large but streamline exit of air.

Another thing that has been discovered is this. The incoming air to cowl becomes stalled and back flows behind the spinner. The air hits the back panel and diverts to the center of engine, travels forward up to and behind the spinner and then re-enters the incoming air. What I would suggest is to place a baffle panel down the center of the engine. Stop the back flow of the air behind the spinner. This should force the air through the cylinders and not back flow. The lower opening should flow 20% more air that what comes in. Air expands as it is heated and needs more room for this expansion. Now this becomes a mute issue the faster you go.
Finally, a prop extention is also helpful.

I know a lot of you have tried a lot of things. Maybe some one can elaborate on what I have said.

I am sorry I can't remember where I read this info on the back flow. I may even be willing to tuff the under cowl and place a camera in this area to test myself.

Any comments???

David K. Fife
3D Composite Aircraft Parts Inc.
428 N. Linwood Beach Rd
Linwood, MI. 48634
989-697-3277
Long EZ in progress.

--- On Sun, 11/15/09, Ralph Baker <rebaker@sc.rr.com> wrote:

From: Ralph Baker <rebaker@sc.rr.com>
Subject: [rebel-builders] cowl
To: rebel-builders@dcsol.com
Date: Sunday, November 15, 2009, 9:33 PM

Bernard,
When Walter says "make the exit area much larger" it does not mean to cut ir forward. It means looking from the rear to make it project lower and /or wider so there is a bigger opening when viewed from the rear. Also, bring the cowl opening to the rear perhaps 50 cm to the rear of the firewall. One final suggestion is to build a small fairing for the bottom lip of the firewall so air coming down the firewall can exit easily and not create turbulence at the bottom lip.
Ralph Baker

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bernard.liagre · Post by **bernard.liagre** » Sun Feb 19, 2012 5:49 pm

Hello,
Ralph, I think I understand what it takes to not pressurize the air in the
speed cowl kit and thank you for the information Extra
I went to the site of David, very good equipment, but I'll go to a
fiberglassspeed cowl kit
Moreover, I look if there is a fairing between the fuselage and derive
composite
best regards
Bernard

On 11/29/2009 12:24 PM, wdl@msn.com wrote to rebel-builders:

->
-> Please forward pics and info on speed cowl flap. I am right at that point.
Thanks
->
->
-> W.D. "Bill" Lowery
-> Cell: 407-947-5777
->
-> ICC General Contractors
-> 3000 W. Osceola Rd.
-> Geneva, FL 32732
->
-> Tel: 407-349-2183
-> Fax: 407-349-0863
->
->
->
->
->
-> > Date: Tue, 17 Nov 2009 07:00:22 -0800
-> > From: aircrafttips@yahoo.com
-> > Subject: Re: [rebel-builders] cowl
-> > To: rebel-builders@dcsol.com
-> >
-> > Hi all your Rebel Builders.
-> >
-> > I have followed this thread and have some info that might help.
-> >
-> > First, I have created a add on panel to the lower Rebel Speed Cowl. The
cost is $125.00.
-> > I am not saying anything more on this as I do not like to use this forum
for sales. Please E-mail me and I can supply photos and you be the judge.
-> >
-> > What this does is lower the cowl about 2 inchs, smooths out the lower
cowl, extend past the fire wall and thus creates a large but streamline exit of
air.
-> >
-> > Another thing that has been discovered is this. The incoming air to cowl
becomes stalled and back flows behind the spinner. The air hits the back
panel and diverts to the center of engine, travels forward up to and behind
the spinner and then re-enters the incoming air. What I would suggest is to
place a baffle panel down the center of the engine. Stop the back flow of the
air behind the spinner. This should force the air through the cylinders and not
back flow. The lower opening should flow 20% more air that what comes in.
Air expands as it is heated and needs more room for this expansion. Now this
becomes a mute issue the faster you go.
-> > Finally, a prop extention is also helpful.
-> >
-> > I know a lot of you have tried a lot of things. Maybe some one can
elaborate on what I have said.
-> >
-> > I am sorry I can't remember where I read this info on the back flow. I
may even be willing to tuff the under cowl and place a camera in this area to
test myself.
-> >
-> > Any comments???
-> >
-> >
-> >
-> > David K. Fife
-> > 3D Composite Aircraft Parts Inc.
-> > 428 N. Linwood Beach Rd
-> > Linwood, MI. 48634
-> > 989-697-3277
-> > Long EZ in progress.
-> >
-> > --- On Sun, 11/15/09, Ralph Baker <rebaker@sc.rr.com> wrote:
-> >
-> >
-> > From: Ralph Baker <rebaker@sc.rr.com>
-> > Subject: [rebel-builders] cowl
-> > To: rebel-builders@dcsol.com
-> > Date: Sunday, November 15, 2009, 9:33 PM
-> >
-> >
-> > Bernard,
-> > When Walter says "make the exit area much larger" it does not mean to
cut ir forward. It means looking from the rear to make it project lower
and /or wider so there is a bigger opening when viewed from the rear. Also,
bring the cowl opening to the rear perhaps 50 cm to the rear of the firewall.
One final suggestion is to build a small fairing for the bottom lip of the firewall
so air coming down the firewall can exit easily and not create turbulence at
the bottom lip.
-> > Ralph Baker
-> >
-> >
-> >
-> > -----------------------------------------------------------------
-> > List archives located at: https://mail.dcsol.com/login
-> > username "rebel" password "builder"
-> > Unsubscribe: rebel-builders-unsubscribe@dcsol.com
-> > List administrator: mike.davis@dcsol.com
-> > -----------------------------------------------------------------
-> >
-> >
-> >
-> >
-> >
-> >
-> >
-> >
-> >
-> >
-> > -----------------------------------------------------------------
-> > List archives located at: https://mail.dcsol.com/login
-> > username "rebel" password "builder"
-> > Unsubscribe: rebel-builders-unsubscribe@dcsol.com
-> > List administrator: mike.davis@dcsol.com
-> > -----------------------------------------------------------------
-> >
-> >
-> >
->

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