X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-05.southeast.rr.com ([24.25.9.104] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2181219 for flyrotary@lancaironline.net; Mon, 16 Jul 2007 16:42:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.104; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-05.southeast.rr.com (8.13.6/8.13.6) with SMTP id l6GKg1o0021140 for ; Mon, 16 Jul 2007 16:42:02 -0400 (EDT) Message-ID: <001d01c7c7e9$d3fae0d0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Duct Coordinates was : [FlyRotary] Re: Oil cooler duct. Date: Mon, 16 Jul 2007 16:42:29 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01C7C7C8.4C983AA0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_001A_01C7C7C8.4C983AA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 -----=20 From: Bobby J. Hughes=20 To: Rotary motors in aircraft=20 Sent: Monday, July 16, 2007 5:26 PM Subject: [FlyRotary] Re: Oil cooler duct. Ed, My notes say 18".=20 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 -----=20 From: Bobby J. Hughes=20 To: Rotary motors in aircraft=20 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 =20 ----- Original Message -----=20 From: Bobby J. Hughes=20 To: Rotary motors in aircraft=20 Sent: Monday, July 16, 2007 5:26 PM Subject: [FlyRotary] Re: Oil cooler duct. Ed, My notes say 18".=20 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 -----=20 From: Bobby J. Hughes=20 To: Rotary motors in aircraft=20 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 =20 -------------------------------------------------------------------------= --- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_001A_01C7C7C8.4C983AA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Too Late, Bobby, I calculated based on a 19" = width=20 {:>)
 
I have sent the coordinate graphs to your e mail = as they=20 are a tad larger than Marv permits.  I had to embed them in a MS = word=20 document - tried converting to jpeg with PaintBrush but it didn't work=20 out.
 
So the one with Height data is looking at the = duct from=20 the side (assuming the core is mounted with the core face perpendicular = to the=20 direction of flight). The Width data is looking at the duct from=20 top/bottom.  So if you shaped a foam core to these coordinates and = then=20 rounded the edges to smooth corners, this should give you a good duct = for your=20 core.
 
Things come together at the inlet around 8-9" = with a 10"=20 wide opening and a 3" wide opening - for cosmetic reasons you could make = the=20 opening slightly wider and height slightly less just so they give you an = opening=20 around 30 sq inches.   So that looks like about 1.5" = above/below=20 center line for a 3" total and 5" left/right of center line for a 10" = width at=20 about 8-10" out from the core.
 
The streamline duct is to be preferred over my = Pinched=20 duct where possible, but once you start getting shorter than about 6" = the=20 truncated Streamline duct starts to show a lot of the core to the = airstream and=20 it is my opinion the drag goes up considerably.  The pinched duct = is=20 basically a compromise duct for those with very short 3-6" duct runner=20 space.
 
 
Hope this helps.
 
Ed
----- Original Message -----
From:=20 Bobby J. = Hughes=20
Sent: Monday, July 16, 2007 = 5:26 PM
Subject: [FlyRotary] Re: Oil = cooler=20 duct.

Ed,
 
My notes say 18".
 
Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Ed=20 Anderson
Sent: Monday, July 16, 2007 1:24 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Oil cooler=20 duct.

Hi Bobby,
 
You actually have sufficient distance to = probably come=20 pretty close to a streamline duct.   Tell me how wide the = core you=20 may use from Ed - the same 19" as the stock or different?  I'll = see what=20 I can come up with.
 
Ed
 
 
----- Original Message -----
From:=20 Bobby = J. Hughes=20
To: Rotary motors in = aircraft=20
Sent: Monday, July 16, 2007 = 3:30=20 PM
Subject: [FlyRotary] Oil = cooler=20 duct.

Ed,
 
It = looks like I=20 have about 10-12 inches of duct between the chin scoop and oil = cooler face.=20 The cooler is a stock mazda but I am considering a slightly larger = one that=20 Ed K. makes. 6.5" tall vs 5" Any suggestions on how you would = shape=20 this duct using the pinched duct approach?
 
Thanks....=20 Bobby 
 
 
----- Original Message -----
From:=20 Bobby J. = Hughes=20
Sent: Monday, July 16, 2007 = 5:26 PM
Subject: [FlyRotary] Re: Oil = cooler=20 duct.

Ed,
 
My notes say 18".
 
Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Ed=20 Anderson
Sent: Monday, July 16, 2007 1:24 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Oil cooler=20 duct.

Hi Bobby,
 
You actually have sufficient distance to = probably come=20 pretty close to a streamline duct.   Tell me how wide the = core you=20 may use from Ed - the same 19" as the stock or different?  I'll = see what=20 I can come up with.
 
Ed
 
 
----- Original Message -----
From:=20 Bobby = J. Hughes=20
To: Rotary motors in = aircraft=20
Sent: Monday, July 16, 2007 = 3:30=20 PM
Subject: [FlyRotary] Oil = cooler=20 duct.

Ed,
 
It = looks like I=20 have about 10-12 inches of duct between the chin scoop and oil = cooler face.=20 The cooler is a stock mazda but I am considering a slightly larger = one that=20 Ed K. makes. 6.5" tall vs 5" Any suggestions on how you would = shape=20 this duct using the pinched duct approach?
 
Thanks....=20 Bobby 
 
 
 

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Homepage:  http://www.flyrotary.com/
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