X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d20.mx.aol.com ([205.188.139.136] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3485976 for flyrotary@lancaironline.net; Tue, 10 Feb 2009 11:37:57 -0500 Received: from WRJJRS@aol.com by imo-d20.mx.aol.com (mail_out_v39.1.) id q.cde.421e25cf (34935) for ; Tue, 10 Feb 2009 11:37:49 -0500 (EST) Received: from smtprly-db03.mx.aol.com (smtprly-db03.mx.aol.com [205.188.249.154]) by cia-da04.mx.aol.com (v123.3) with ESMTP id MAILCIADA048-5c404991ad55d3; Tue, 10 Feb 2009 11:37:48 -0500 Received: from webmail-db20 (webmail-db20.webmail.aol.com [205.188.105.85]) by smtprly-db03.mx.aol.com (v121_r5.5) with ESMTP id MAILSMTPRLYDB036-5c404991ad55d3; Tue, 10 Feb 2009 11:37:41 -0500 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: My RV10 Cowl Date: Tue, 10 Feb 2009 11:37:40 -0500 X-AOL-IP: 66.253.96.220 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CB59B5068934C0_1508_D48_webmail-db20.sysops.aol.com" X-Mailer: AOL Webmail 41421-STANDARD Received: from 66.253.96.220 by webmail-db20.sysops.aol.com (205.188.105.85) with HTTP (WebMailUI); Tue, 10 Feb 2009 11:37:40 -0500 Message-Id: <8CB59B5064D9A28-1508-687@webmail-db20.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CB59B5068934C0_1508_D48_webmail-db20.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Bobby, Most of the high pressure areas on the cowl are pretty turbulent so I doubt you would have much trouble. The high speed regieme is going to be interesting. You might need to provide some back up to the ducts. The force caused by high speed air can be impressive. You have a different and effective solution. Cheers, Bill Jepson -----Original Message----- From: Bobby J. Hughes To: Rotary motors in aircraft Sent: Mon, 9 Feb 2009 4:50 pm Subject: [FlyRotary] Re: My RV10 Cowl No exit ducts. It just dumps into the cowl. I don't think the ducts are in a?boundary layer. They are partially submerged but pretty?much in straight?in the air flow. ?Here's a pic of the plug during construction that shows the ice cream scoop cut in. From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of wrjjrs@aol.com Sent: Monday, February 09, 2009 6:22 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: My RV10 Cowl Interesting Bobby, Seems to be working. Is there another set of ducts the turns the air the rest of the way round? Or does the air exit the rads to flow into the cowl and then exit rearward like the opening in a conventional air cooled engine? I can't really tell from the pictures, but I wondered if?you bothered with any kind of boundry layer control? Good luck and I hope for your continued success. Bill Jepson? -----Original Message----- From: Bobby J. Hughes To: Rotary motors in aircraft Sent: Mon, 9 Feb 2009 3:46 pm Subject: [FlyRotary] Re: My RV10 Cowl Bill, Here is the rest of the picture. The?cowl is actually three pieces. The bottom fairing slides into place to feed the radiator ducts.?The air makes a 360. ?Not my first?plan but it seems to be working.? The ducts are?in high pressure at any attitude and it would appear they are getting?good air from the prop.??With the cowl off? and an OAT of 65 I had a hard time warming up the oil.? Stuffing carpet in ducts solved that problem. Bobby ? ? Looking good Bobby, Interesting inlet solution. Any ducting or a straight inlet to a plenum?? Good numbers. Bill Jepson ? A Good Credit Score is 700 or Above. See yours in just 2 easy steps! -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html A Good Credit Score is 700 or Above. See yours in just 2 easy steps! -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html [Image Removed] ----------MB_8CB59B5068934C0_1508_D48_webmail-db20.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii" Bobby,
Most of the high pressure areas on the cowl are pretty turbulent so I doubt you would have much trouble. The high speed regieme is going to be interesting. You might need to provide some back up to the ducts. The force caused by high speed air can be impressive. You have a different and effective solution. Cheers,
Bill Jepson


-----Original Message-----
From: Bobby J. Hughes <bhughes@qnsi.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 9 Feb 2009 4:50 pm
Subject: [FlyRotary] Re: My RV10 Cowl

No exit ducts. It just dumps into the cowl. I don't think the ducts are in a boundary layer. They are partially submerged but pretty much in straight in the air flow.  Here's a pic of the plug during construction that shows the ice cream scoop cut in.
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of wrjjrs@aol.com
Sent: Monday, February 09, 2009 6:22 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: My RV10 Cowl

Interesting Bobby,
Seems to be working. Is there another set of ducts the turns the air the rest of the way round? Or does the air exit the rads to flow into the cowl and then exit rearward like the opening in a conventional air cooled engine? I can't really tell from the pictures, but I wondered if you bothered with any kind of boundry layer control? Good luck and I hope for your continued success.
Bill Jepson 



-----Original Message-----
From: Bobby J. Hughes <bhughes@qnsi.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 9 Feb 2009 3:46 pm
Subject: [FlyRotary] Re: My RV10 Cowl

Bill,
Here is the rest of the picture. The cowl is actually three pieces. The bottom fairing slides into place to feed the radiator ducts. The air makes a 360.  Not my first plan but it seems to be working.  The ducts are in high pressure at any attitude and it would appear they are getting good air from the prop.  With the cowl off  and an OAT of 65 I had a hard time warming up the oil.  Stuffing carpet in ducts solved that problem. Bobby
 

 

Looking good Bobby,
Interesting inlet solution. Any ducting or a straight inlet to a plenum?  Good numbers.
Bill Jepson

 



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