X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-gg0-f171.google.com ([209.85.161.171] verified) by logan.com (CommuniGate Pro SMTP 6.0) with ESMTPS id 5959292 for flyrotary@lancaironline.net; Wed, 19 Dec 2012 16:33:44 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.161.171; envelope-from=ceengland7@gmail.com Received: by mail-gg0-f171.google.com with SMTP id 4so578867ggm.2 for ; Wed, 19 Dec 2012 13:33:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:subject:references:from:content-type:x-mailer :in-reply-to:message-id:date:to:content-transfer-encoding :mime-version; bh=treYJKM/OOU9L1bLkWqSusZu1lscuXxNpqyGM8cvmI4=; b=Refe4AtO3N/wlYyE53sILhda0j6Wt2LDvHSBmP/m6Qa11Z0t6HljMCrTu71bW5yGiR kpaGNzgqIq3TPzH4b8nM3HXq7acx+rs/yaGU5h5FxYEh3hdq9MEkG9jsDU5Yk6AECf0G 4GfKeEBRWl3h55qjkg85fGpphUSNL7lHcYuQVTfxw5aqiwiCqjvKfzwgA7r82Nh4BGWQ Ac80WfAnCD5KNE9MlUY9mBw2HFPMK3dyWvpN/cdCS4wKBXYfh8urgFDQw/PZCCFoomaZ CkSFKTOyq/fBgDyFlixFIHnFRrVzsreOfiWye0KbIs7UhqCiWpmesooFLXzaetLE7PI4 Sz/A== X-Received: by 10.101.151.19 with SMTP id d19mr1969419ano.83.1355952790929; Wed, 19 Dec 2012 13:33:10 -0800 (PST) Return-Path: Received: from [192.168.1.12] (cpe-075-177-053-149.triad.res.rr.com. [75.177.53.149]) by mx.google.com with ESMTPS id l51sm5693680yhh.16.2012.12.19.13.33.09 (version=SSLv3 cipher=OTHER); Wed, 19 Dec 2012 13:33:09 -0800 (PST) Subject: Re: [FlyRotary] Re: Duct fabrication References: From: Charlie E Content-Type: multipart/alternative; boundary=Apple-Mail-8B4EE7F5-008E-4343-9DF9-63318772073B X-Mailer: iPhone Mail (10A403) In-Reply-To: Message-Id: <2ACC106E-EAF4-4D9B-9581-21C8CD6C70E2@gmail.com> Date: Wed, 19 Dec 2012 16:33:07 -0500 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-8B4EE7F5-008E-4343-9DF9-63318772073B Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable As yet undetermined. I'm leaning toward a side exit to keep a clean path, bu= t bottom would *look* cleaner. I hope the flow is as good as it looks. :-)9 I plan on a left nostril inlet for the oil cooler, & have the same exit ques= tion for it. Charlie Sent from my iPhone On Dec 19, 2012, at 9:46 AM, Jeff Whaley wrote: > Hi Charlie: > I liked your photo bucket =E2=80=A6 > Where are you planning to route your exit duct? - Out the bottom or side o= f your cowlings? > Jeff > =20 > From: > Charlie England > Subject: > Re: [FlyRotary] Re: Duct Fabrication > Date: > Sat, 15 Dec 2012 11:07:26 -0600 > To: > Rotary motors in aircraft > >=20 > > Disclaimer: I'm a long way from even running the engine. >=20 > I tried to copy (at least in spirit) Tracy's install, as well. Renesis in R= V-7. For fit (& financial) reasons, I used a Civic racing rad that has a mor= e or less square face & is a downflow design instead of a crossflow 2 pass l= ike the Scirocco style that Tracy used. It's around 400 cu in volume. One th= ing I intend to try is to use an exit duct. Because of this, my duct is on t= he engine side of the rad (Tracy dumps his exit air toward the engine). The l= ayout in my cowl (I wanted as straight a shot as possible into the wedge) & t= he desire for an exit duct forced that change for my installation. >=20 > I tried to use the formulas & guidance from the K&W book as a starting poi= nt, but discovered that some of the stuff about wedges doesn't seem to match= 'real world' application. Tracy saw my 1st draft & warned that it wasn't th= in enough at the back of the wedge, & he was right. I used canned foam to re= -shape the wedge to thin it out at the back. Once I determine that the inter= nal shape actually works, I'll glass over the canned foam. I also used a tur= ning vane in the duct to get more even air distribution through the core (th= anks to Al Gietzen for that tip). The vane was needed because the inlet heig= ht is well above the center-line of the rad. I did try to use the K&W stream= line diffuser concept to transition from the round inlet to the somewhat lar= ger area of the entrance to the 'wedge'.=20 >=20 > I used clear packing tape as a release on the flatter areas, and cheap ele= ctrical tape on the highly curved areas. Tape works fine as a release, but a= ny texture on the form will get reproduced in your part. I had to do a lot o= f work to smooth the interior of the duct because of the ridges formed by wr= apping the tape around the form. It's a lot like painting; if you do a lot o= f prep work, there will be a lot less finish (repair) work on the duct.=20 >=20 > Shots showing the core I made, & the resulting duct with turning vane are o= n Photobucket at =20 > http://s1155.beta.photobucket.com/user/rv7charlie/library/radiator%20duct >=20 > Video of the airflow is at >=20 > http://www.youtube.com/watch?v=3DD0mUJdzzrG0 >=20 > Charlie >=20 >=20 > =20 > This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unautho= rized disclosure is strictly prohibited. If you have received this message i= n error, please notify us immediately so that we may correct our internal re= cords. Please then delete the original message. Thank you. --Apple-Mail-8B4EE7F5-008E-4343-9DF9-63318772073B Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
As yet undetermined. I'm leaning towar= d a side exit to keep a clean path, but bottom would *look* cleaner. I hope t= he flow is as good as it looks. :-)9

I plan on a le= ft nostril inlet for the oil cooler, & have the same exit question for i= t.

Charlie

Sent from my iPhone
On Dec 19, 2012, at 9:46 AM, Jeff Whaley <jwhaley@datacast.com> wrote:

=

Hi Charlie:

I liked your photo bucket =E2=80=A6

Where are you planning to route your exit duct? - Out= the bottom or side of your cowlings?

Jeff

 

From:

Charlie England <ceengland7@gmail.com>

Subject:

Re: [FlyRotary] Re: Duct Fabrication

Date:

Sat, 15 Dec 2012 11:07:26 -0600

To:

Rotary motors in aircraft <flyrotary@lancaironline.net>

<image001.gif>

<i= mage002.gif>

Disclaimer: I'm a long way from even runn= ing the engine.

I tried to copy (at least in spirit) Tracy's install, as well. Renesis in RV= -7. For fit (& financial) reasons, I used a Civic racing rad that has a m= ore or less square face & is a downflow design instead of a crossflow 2 p= ass like the Scirocco style that Tracy used. It's around 400 cu in volume. One thing I intend to try is to use an e= xit duct. Because of this, my duct is on the engine side of the rad (Tracy d= umps his exit air toward the engine). The layout in my cowl (I wanted as str= aight a shot as possible into the wedge) & the desire for an exit duct forced that change for my inst= allation.

I tried to use the formulas & guidance from the K&W book as a starti= ng point, but discovered that some of the stuff about wedges doesn't seem to= match 'real world' application. Tracy saw my 1st draft & warned that it= wasn't thin enough at the back of the wedge, & he was right. I used canned foam to re-shape the wedge to thin it out= at the back. Once I determine that the internal shape actually works, I'll g= lass over the canned foam. I also used a turning vane in the duct to get mor= e even air distribution through the core (thanks to Al Gietzen for that tip). The vane was needed because t= he inlet height is well above the center-line of the rad. I did try to use t= he K&W streamline diffuser concept to transition from the round inlet to= the somewhat larger area of the entrance to the 'wedge'.

I used clear packing tape as a release on the flatter areas, and cheap elect= rical tape on the highly curved areas. Tape works fine as a release, but any= texture on the form will get reproduced in your part. I had to do a lot of w= ork to smooth the interior of the duct because of the ridges formed by wrapping the tape around the form.= It's a lot like painting; if you do a lot of prep work, there will be a lot= less finish (repair) work on the duct.

Shots showing the core I made, & the resulting duct with turning vane ar= e on Photobucket at  

http://s1155.beta.p= hotobucket.com/user/rv7charlie/library/radiator%20duct

=


Video of the airflow is at

http://www.youtube.com/watch?v=3DD0mUJdzzrG0


Charlie

 

This message, and the documents attached hereto, is intended only for the ad= dressee and may contain privileged or confidential information. Any unauthor= ized disclosure is strictly prohibited. If you have received this message in= error, please notify us immediately so that we may correct our internal records. Please then delete the origina= l message. Thank you.
= --Apple-Mail-8B4EE7F5-008E-4343-9DF9-63318772073B--