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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