X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from an-out-0708.google.com ([209.85.132.250] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2183168 for flyrotary@lancaironline.net; Tue, 17 Jul 2007 14:03:06 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.132.250; envelope-from=rotary.thjakits@gmail.com Received: by an-out-0708.google.com with SMTP id b2so281710ana for ; Tue, 17 Jul 2007 11:02:26 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=lHfzYE04DICMnRh/oNqMGmHFwrG21croSHoqFkk98kBgMV5yZW0LYMtNPh0JNh5HfKRb5WEsv0sq//hgHazMqS20WiM4L+/N1WbnPA9NGdTx8duuut1LfwNWwOaws2kAKkpYyVjf7oFQA//MV/ThQ7Af2JTRSdY6sMC+L9BuQog= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=CM920hwbIuuSGSvUriMRu0kC4oHaL1HztWvv2I1QEr6oZTsjDAuPuRZVnIy+ZAntITY0tptJiI/iggBPd2p45zJgPu7Y3nqfuHQhCPxcOpKGsqZXpJJtsJkshdv22eJThUpcmQ6UEFh6/S8+GCeIUfG985ufZeTnyqffiMTxvFc= Received: by 10.100.191.5 with SMTP id o5mr365644anf.1184695346086; Tue, 17 Jul 2007 11:02:26 -0700 (PDT) Received: by 10.100.197.17 with HTTP; Tue, 17 Jul 2007 11:02:26 -0700 (PDT) Message-ID: <63163d560707171102l2d9eff9bh92728e1959ddf6ab@mail.gmail.com> Date: Tue, 17 Jul 2007 13:02:26 -0500 From: "Thomas Jakits" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Duct Coordinates was : [FlyRotary] Re: Oil cooler duct. In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_111014_2502201.1184695346040" References: ------=_Part_111014_2502201.1184695346040 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Thanx Ed! TJ On 7/17/07, Ed Anderson wrote: > > Mailed it to you direct, TJ. Its right at the limit for the list. > > Ed > > ----- Original Message ----- > *From:* Thomas Jakits > *To:* Rotary motors in aircraft > *Sent:* Tuesday, July 17, 2007 12:29 PM > *Subject:* [FlyRotary] Re: Duct Coordinates was : [FlyRotary] Re: Oil > cooler duct. > > If the file is not too big, please mail it to the list.. > > ....or a copy to my email, if you don't mind: thjakits@gmail.com > > THanx, > > TJ > > On 7/16/07, Richard Nadig wrote: > > > > 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 > > 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 > > > > > > > > ------------------------------ > > Bored stiff? Loosen up... > > Download and play hundreds of games for freeon Yahoo! Games. > > > > ------=_Part_111014_2502201.1184695346040 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Thanx Ed!

TJ

On 7/17/07, Ed Anderson <eanderson@carolina.rr.com> wrote:
Mailed it to you direct, TJ.  Its right at the limit for the list.
 
Ed
----- Original Message -----
Sent: Tuesday, July 17, 2007 12:29 PM
Subject: [FlyRotary] Re: Duct Coordinates was : [FlyRotary] Re: Oil cooler duct.

If the file is not too big, please mail it to the list..

....or a copy to my email,  if you don't mind: thjakits@gmail.com

THanx,

TJ

On 7/16/07, Richard Nadig <blueren@yahoo.com> wrote:
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 
 
 
 

--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html



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