X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from web54101.mail.re2.yahoo.com ([206.190.37.236] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with SMTP id 2181630 for flyrotary@lancaironline.net; Mon, 16 Jul 2007 21:05:35 -0400 Received-SPF: none receiver=logan.com; client-ip=206.190.37.236; envelope-from=blueren@yahoo.com Received: (qmail 60015 invoked by uid 60001); 17 Jul 2007 01:05:00 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type:Message-ID; b=AoXqmyMNRuIriDM9nCDlcwiTI5C04aVtftwlAuwT16yn0GNuWIIMX5xaakC2A/dGewpCOIYT4Klhy0oUheGUYj2GJuQCrMx1lkR7h4xkxTbuDB4d9VFMkYnMsGsu2sVtTAs6GMyhfwGIMzrsdt0g2zmW05WfQS1jICmXCn4R3No=; X-YMail-OSG: nEPmpMkVM1lx1hYuX7W4cRW79vUqEJN8BataIarVOsBVfUpHw4r5eRhGBO2yk1z0KLeq..LOsfdT0SNPDfxl0zvxb7yCmAyISER_YFY0p.j2lXaIiBTGCaP1 Received: from [4.153.53.110] by web54101.mail.re2.yahoo.com via HTTP; Mon, 16 Jul 2007 18:05:00 PDT X-Mailer: YahooMailRC/651.41 YahooMailWebService/0.7.41.16 Date: Mon, 16 Jul 2007 18:05:00 -0700 (PDT) From: Richard Nadig Subject: Re: [FlyRotary] Duct Coordinates was : [FlyRotary] Re: Oil cooler duct. To: Rotary motors in aircraft MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-558824673-1184634300=:59869" Message-ID: <133444.59869.qm@web54101.mail.re2.yahoo.com> --0-558824673-1184634300=:59869 Content-Type: text/plain; charset=ascii Ed, Could you send a copy of the coordinate graphs to me at my email address? May redesign my oil cooler duct. Thanks, Rich ----- Original Message ---- From: Ed Anderson To: Rotary motors in aircraft Sent: Monday, July 16, 2007 4:42:29 PM Subject: [FlyRotary] Duct Coordinates was : [FlyRotary] Re: Oil cooler duct. Too Late, Bobby, I calculated based on a 19" width {:>) I have sent the coordinate graphs to your e mail as they are a tad larger than Marv permits. I had to embed them in a MS word document - tried converting to jpeg with PaintBrush but it didn't work out. So the one with Height data is looking at the duct from the side (assuming the core is mounted with the core face perpendicular to the direction of flight). The Width data is looking at the duct from top/bottom. So if you shaped a foam core to these coordinates and then rounded the edges to smooth corners, this should give you a good duct for your core. Things come together at the inlet around 8-9" with a 10" wide opening and a 3" wide opening - for cosmetic reasons you could make the opening slightly wider and height slightly less just so they give you an opening around 30 sq inches. So that looks like about 1.5" above/below center line for a 3" total and 5" left/right of center line for a 10" width at about 8-10" out from the core. The streamline duct is to be preferred over my Pinched duct where possible, but once you start getting shorter than about 6" the truncated Streamline duct starts to show a lot of the core to the airstream and it is my opinion the drag goes up considerably. The pinched duct is basically a compromise duct for those with very short 3-6" duct runner space. Hope this helps. Ed ----- Original Message ----- From: Bobby J. Hughes To: Rotary motors in aircraft Sent: Monday, July 16, 2007 5:26 PM Subject: [FlyRotary] Re: Oil cooler duct. Ed, My notes say 18". Bobby From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson Sent: Monday, July 16, 2007 1:24 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Oil cooler duct. Hi Bobby, You actually have sufficient distance to probably come pretty close to a streamline duct. Tell me how wide the core you may use from Ed - the same 19" as the stock or different? I'll see what I can come up with. Ed ----- Original Message ----- From: Bobby J. Hughes To: Rotary motors in aircraft Sent: Monday, July 16, 2007 3:30 PM Subject: [FlyRotary] Oil cooler duct. Ed, It looks like I have about 10-12 inches of duct between the chin scoop and oil cooler face. The cooler is a stock mazda but I am considering a slightly larger one that Ed K. makes. 6.5" tall vs 5" Any suggestions on how you would shape this duct using the pinched duct approach? Thanks.... Bobby ----- Original Message ----- From: Bobby J. Hughes To: Rotary motors in aircraft Sent: Monday, July 16, 2007 5:26 PM Subject: [FlyRotary] Re: Oil cooler duct. Ed, My notes say 18". Bobby From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson Sent: Monday, July 16, 2007 1:24 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Oil cooler duct. Hi Bobby, You actually have sufficient distance to probably come pretty close to a streamline duct. Tell me how wide the core you may use from Ed - the same 19" as the stock or different? I'll see what I can come up with. Ed ----- Original Message ----- From: Bobby J. Hughes To: Rotary motors in aircraft Sent: Monday, July 16, 2007 3:30 PM Subject: [FlyRotary] Oil cooler duct. Ed, It looks like I have about 10-12 inches of duct between the chin scoop and oil cooler face. The cooler is a stock mazda but I am considering a slightly larger one that Ed K. makes. 6.5" tall vs 5" Any suggestions on how you would shape this duct using the pinched duct approach? Thanks.... Bobby -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ____________________________________________________________________________________ The fish are biting. Get more visitors on your site using Yahoo! Search Marketing. http://searchmarketing.yahoo.com/arp/sponsoredsearch_v2.php --0-558824673-1184634300=:59869 Content-Type: text/html; charset=ascii
Ed,  Could you send a copy of the coordinate graphs to me at my email address?  May redesign my oil cooler duct.  Thanks, Rich

----- Original Message ----
From: Ed Anderson <eanderson@carolina.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Monday, July 16, 2007 4:42:29 PM
Subject: [FlyRotary] Duct Coordinates was : [FlyRotary] Re: Oil cooler duct.

Too Late, Bobby, I calculated based on a 19" width {:>)
 
I have sent the coordinate graphs to your e mail as they are a tad larger than Marv permits.  I had to embed them in a MS word document - tried converting to jpeg with PaintBrush but it didn't work out.
 
So the one with Height data is looking at the duct from the side (assuming the core is mounted with the core face perpendicular to the direction of flight). The Width data is looking at the duct from top/bottom.  So if you shaped a foam core to these coordinates and then rounded the edges to smooth corners, this should give you a good duct for your core.
 
Things come together at the inlet around 8-9" with a 10" wide opening and a 3" wide opening - for cosmetic reasons you could make the opening slightly wider and height slightly less just so they give you an opening around 30 sq inches.   So that looks like about 1.5" above/below center line for a 3" total and 5" left/right of center line for a 10" width at about 8-10" out from the core.
 
The streamline duct is to be preferred over my Pinched duct where possible, but once you start getting shorter than about 6" the truncated Streamline duct starts to show a lot of the core to the airstream and it is my opinion the drag goes up considerably.  The pinched duct is basically a compromise duct for those with very short 3-6" duct runner space.
 
 
Hope this helps.
 
Ed
----- Original Message -----
Sent: Monday, July 16, 2007 5:26 PM
Subject: [FlyRotary] Re: Oil cooler duct.

Ed,
 
My notes say 18".
 
Bobby

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Monday, July 16, 2007 1:24 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Oil cooler duct.

Hi Bobby,
 
You actually have sufficient distance to probably come pretty close to a streamline duct.   Tell me how wide the core you may use from Ed - the same 19" as the stock or different?  I'll see what I can come up with.
 
Ed
 
 
----- Original Message -----
Sent: Monday, July 16, 2007 3:30 PM
Subject: [FlyRotary] Oil cooler duct.

Ed,
 
It looks like I have about 10-12 inches of duct between the chin scoop and oil cooler face. The cooler is a stock mazda but I am considering a slightly larger one that Ed K. makes. 6.5" tall vs 5" Any suggestions on how you would shape this duct using the pinched duct approach?
 
Thanks.... Bobby 
 
 
----- Original Message -----
Sent: Monday, July 16, 2007 5:26 PM
Subject: [FlyRotary] Re: Oil cooler duct.

Ed,
 
My notes say 18".
 
Bobby

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Monday, July 16, 2007 1:24 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Oil cooler duct.

Hi Bobby,
 
You actually have sufficient distance to probably come pretty close to a streamline duct.   Tell me how wide the core you may use from Ed - the same 19" as the stock or different?  I'll see what I can come up with.
 
Ed
 
 
----- Original Message -----
Sent: Monday, July 16, 2007 3:30 PM
Subject: [FlyRotary] Oil cooler duct.

Ed,
 
It looks like I have about 10-12 inches of duct between the chin scoop and oil cooler face. The cooler is a stock mazda but I am considering a slightly larger one that Ed K. makes. 6.5" tall vs 5" Any suggestions on how you would shape this duct using the pinched duct approach?
 
Thanks.... Bobby 
 
 
 

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