X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=PNVxBsiC c=1 sm=1 tr=0 a=dBiZQp+9QpckKgSs3pOOGg==:117 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=0o9FgrsRnhwA:10 a=5X3xD6UQWCAA:10 a=hOpmn2quAAAA:8 a=Ia-xEzejAAAA:8 a=UTUPWuxJAAAA:8 a=72oAJGUfBbtRRpJYW_gA:9 a=QEXdDO2ut3YA:10 a=XmaCXBWT5UF7ES4YhZsA:9 a=SKSJreRZ7byokR9a:21 a=_W_S_7VecoQA:10 a=frz4AuCg-hUA:10 a=GyA-uvUxXSCciAkwuKQO:22 a=Urk15JJjZg1Xo0ryW_k8:22 a=qF2lkv868AjrTulUL3Qw:22 From: "Ernest Christley echristley@att.net" Received: from sonic316-10.consmr.mail.gq1.yahoo.com ([98.137.69.34] verified) by logan.com (CommuniGate Pro SMTP 6.2.13) with ESMTPS id 12747505 for flyrotary@lancaironline.net; Tue, 09 Jul 2019 16:02:43 -0400 Received-SPF: none receiver=logan.com; client-ip=98.137.69.34; envelope-from=echristley@att.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=att.net; s=s1024; t=1562702545; bh=WbiyPFqrLJLkCTBFILxkJwqIAercm99y4HgndIFWOyw=; h=Date:From:To:In-Reply-To:References:Subject:From:Subject; b=4RZHQvzVZDFt9/CTRQ7VkcnNOEWnu0nwyrTvW2PkbfAPugkyuovr8ihrXos89M4t1wyFAAHwKm1BiU+zZADMGvRwx03uJJjaLvdmBhdSm3H8K2CFMY1/9mmSbsdJLSBBPNV3UdTgTOaeYlz0K2zuWZX2luv/QUnXP9vIqFvQycQ= X-YMail-OSG: MJOZGF8VM1m_07YGdAfyIzX4noZgCPqoOXznbdZmyl02oBnvhFfXAmfTR5Lnn7V SdYa5IVtWEOadWudrrNpcajnWmql3WZAey4.Ai9kEHEh1OK1oo1VDN61H_o2HHk3CYFViiAbbr7N BXJjNHgab1Jr1bwMKLXWc_f0eHHxog98PXkxVhTSImWG.Mh_8mgxZLPqHf.eobGRaLm_wTTvRl7J MnZ2OEMILwjpBfVvX6xD0aR9fXC2Q6XYwL23DZx2gfxX41jAlg5ZPyDTJsVG_YZlK2xphpi47Klo jDd3x2iiTlm1QOJHf4xbRfA4x.PMg7u5A5BXzE74GsX3KEtghd9YH0C5Suy4v8kJYNKK6K9zwmF0 _Uw2zwBIuLP9WD3SlH2mLZ19j3xBlaumbR.XdRPrA0j9.fACNvJr4HvTuKOrYqQQDs_J4J1yVfAa EgnlgmFtGlwcvr6ItMmsqw4x3FtSXLp2sp_k.5rDM8byg15THBUloplYGjGdKuTDJvqq8_q.67CE yu3Qb2AI7q10JNCVPPwp8uNCZ3wDT5azhERS2aMYocJeYdmb9lm2uBbQuaZf7xXaMUFALo7ochE6 j3vcvzjMvUa412VtUlMFTdAzAJou4IE4XfoJ3yRBT0xoSwarmUyMqDiyqRgK3z58Ccadkxtn5Ail 1MG517c7zC8JBOTP86btO9gUBwvNVtezLY.JL_EyFoIbu_d6DyxAl3tWomK6seCq1a6iiVmW0Y89 Io_pWUmogo.9i4F0FDYeOrWb_nMuUIVX0liGFvq4CUKtyf0tPuvvxHvRgBihPtvGt9FkJoV9lgGF ybDeFsupzydvWg5Th2sgCtcoEJ0QwZ8uusil9Zzfvs0S4pxVscuN6i5fzXVYjp6kKU73C1V1j.kG WautDMNUxPpF9mCdm1Xfj4MvUKY4ch.T9afUZyOQZhwP2JFvs.2qoorKkmnl48dRLquPfVv4ibEs nFQxHFQibd7JKzKAIgtBrH1SdDfbZAb.ljvwQe_cxlSN5UTS0NFtdsKtBzGDRe4OP.oMAEvZ0iT3 g1gCZFg6ZvS8a2M1yPWfPu8bewuW7Q3w4g4hpQi7mt8wcEb1zub7Rd1Fx1Y7LRReNeirt2KNHf1D FNYmGVTKrdVwdEcPDn8gN5JqtWKD83gLANg6kOZH5VkvBz7NG5AyVuoXwYxrQqlwIypv3VAKpr92 BNQbNnem7HzKv9spL6XMbnyVNgLce4RFtp6esOxcUZ5_N5alA9o03KT8gNVl5z1Mi3jM- Received: from sonic.gate.mail.ne1.yahoo.com by sonic316.consmr.mail.gq1.yahoo.com with HTTP; Tue, 9 Jul 2019 20:02:25 +0000 Date: Tue, 9 Jul 2019 20:02:00 +0000 (UTC) To: "Marc Wiese cardmarc@charter.net" Message-ID: <67978789.639986.1562702520592@mail.yahoo.com> In-Reply-To: References: Subject: Re: [FlyRotary] airflow characteristics-radiators and spinner MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_639985_2069541395.1562702520590" X-Mailer: WebService/1.1.13913 YMailNorrin Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:66.0) Gecko/20100101 Firefox/66.0 Content-Length: 7692 ------=_Part_639985_2069541395.1562702520590 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable The only thing to add to that document is that the internal shape of most = of the ducts shown are all wrong.=C2=A0 The race car in figure 19 has it ab= out right, though.=C2=A0 The bell shaped ducts shown in most of the drawing= s force the air to separate from the duct wall soon after the entrance, cre= ating the turbulent flow he is talking about in other sections of the docum= ent.=C2=A0 A trumpet shaped duct, one that doesn't flair out until right be= fore the cooler, will increase cooling capacity up to 30%. On Tuesday, July 9, 2019, 2:01:26 PM EDT, Marc Wiese cardmarc@charter.n= et wrote: =20 =20 Interesting discussion recently found--- M This document is shared with you in response to various questions arising o= ut of spinner airflow characteristics. It is TOO LENGTHY to include in full= , but you may find parts interesting enough to share. =C2=A0 [Here's a French version of the English document I found that's easier to s= ee/read.] =C2=A0 http://acversailles.free.fr/documentation/08~Documentation_Generale_M_Suire= /Moteur/Refroidissement/Conception/Cooling_systems_for_automotive_conversio= n~H.Mayer.pdf =C2=A0 [I find it odd that he misses a major point that did emerge from those deca= des of engine cooling research: cooling fin pitch is very important!=20 Nowadays, most folks use the free software from GM_Harrison and others to d= esign their coolers... but the delta P in automotive applications is genera= lly less, but the airflow is greater. So a different fin pitch is appropria= te for our relatively higher delta P (much higher speed through the air tha= n a car) but lower airflows (to minimize cooling drag) applications.] =C2=A0 =20 ------=_Part_639985_2069541395.1562702520590 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
The only thing to add to tha= t document is that the internal shape of most of the ducts shown are all wr= ong.  The race car in figure 19 has it about right, though.  The = bell shaped ducts shown in most of the drawings force the air to separate f= rom the duct wall soon after the entrance, creating the turbulent flow he i= s talking about in other sections of the document.  A trumpet shaped d= uct, one that doesn't flair out until right before the cooler, will increas= e cooling capacity up to 30%.

=20
=20
On Tuesday, July 9, 2019, 2:01:26 PM EDT, Marc Wiese ca= rdmarc@charter.net <flyrotary@lancaironline.net> wrote:


Interesting discussion = recently found---

M

This document is shared with you in response = to various questions arising out of spinner airflow characteristics. It is = TOO LENGTHY to include in full, but you may find parts interesting enough t= o share.

 

[Here's a French version of the English document= I found that's easier to see/read.]

 

http://acversailles.free.fr/docume= ntation/08~Documentation_Generale_M_Suire/Moteur/Refroidissement/Conception= /Cooling_systems_for_automotive_conversion~H.Mayer.pdf

 

[I find it odd that he misses a major point that did emerge from those de= cades of engine cooling research: cooling fin pitch is very important!

Nowadays, most folks use the free software from GM_Harrison and others to= design their coolers... but the delta P in automotive applications is gene= rally less, but the airflow is greater. So a different fin pitch is appropr= iate for our relatively higher delta P (much higher speed through the air t= han a car) but lower airflows (to minimize cooling drag) applications.]

 

------=_Part_639985_2069541395.1562702520590--