Sent: Thu, 15 Nov 2007 8:29 pm Subject: [FlyRotary] Cowling Airflow I have been thinking about how I want to try and flow the air through my Sam James "Rotary Cowling" and I am wondering what you all thought about the possibility of?creating some "bypass" air to help accelerate the airflow out of the engine before it re-enters the airflow along the belly of the aircraft.? ? I also was wondering if there might be some advantage?during ground operations and climb out if I install some?kind of door as seen in the diagram... ? Doug Lomheim RV-9A, FWF...contemplating the placement of stuff...? See what's new at AOL.com and Make AOL Your Homepage. -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ________________________________________________________________________ Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com ----------MB_8C9F6816D94926A_9D4_6053_WEBMAIL-MC14.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii"

Doug,

I don't think the secondary flap is a bad idea, but placement is crucial. If the outlet isn't in a low-pressure area it can result in worse flow rather than better. The MGB roadster comes to mind. They put some vents on top of the fenders to let the heat out of the engine compartment and found out later that they were in a high pressure area and caused inflow at speed rather than outflow! Cooling suffered. I think the bypass air idea isn't a bad idea but I believe you will find that it doesn't matter where you accellerate the flow you will still pay the same drag penalty. (that is, it probably won't work any better)

Bill Jepson

-----Original Message-----
From: DLOMHEIM@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 15 Nov 2007 8:29 pm
Subject: [FlyRotary] Cowling Airflow

I have been thinking about how I want to try and flow the air through my Sam James "Rotary Cowling" and I am wondering what you all thought about the possibility of creating some "bypass" air to help accelerate the airflow out of the engine before it re-enters the airflow along the belly of the aircraft.

I also was wondering if there might be some advantage during ground operations and climb out if I install some kind of door as seen in the diagram...

Doug Lomheim

RV-9A, FWF...contemplating the placement of stuff...

See what's new at AOL.com and Make AOL Your Homepage.

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