X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=PNVxBsiC c=1 sm=1 tr=0 a=CD5TnntNgZSTsHQ6nLFA4Q==:117 a=xycr6CVXJRVtFs4WRGOeRA==:17 a=0o9FgrsRnhwA:10 a=DAwyPP_o2Byb1YXLmDAA:9 a=UTUPWuxJAAAA:8 a=txn80U6VlK1tgOai7JIA:9 a=CjuIK1q_8ugA:10 a=yMhMjlubAAAA:8 a=SSmOFEACAAAA:8 a=nby1dGrHpmWlqHoR3r0A:9 a=DQhTgvfcTsQJt08o:21 a=gKO2Hq4RSVkA:10 a=UiCQ7L4-1S4A:10 a=hTZeC7Yk6K0A:10 a=frz4AuCg-hUA:10 a=qF2lkv868AjrTulUL3Qw:22 a=pHzHmUro8NiASowvMSCR:22 a=nt3jZW36AmriUCFCBwmW:22 From: "Marc Wiese cardmarc@charter.net" Received: from [47.43.20.28] (HELO impout004.msg.chrl.nc.charter.net) by logan.com (CommuniGate Pro SMTP 6.2.13) with ESMTPS id 12747240 for flyrotary@lancaironline.net; Tue, 09 Jul 2019 14:01:23 -0400 Received-SPF: pass receiver=logan.com; client-ip=47.43.20.28; envelope-from=cardmarc@charter.net Received: from HomeDesktop ([97.94.202.172]) by cmsmtp with ESMTP id kuQLhj3fgmrIrkuQMhk9RK; Tue, 09 Jul 2019 18:01:06 +0000 Authentication-Results: charter.net; none X-Authority-Analysis: v=2.3 cv=eO2nc0h1 c=1 sm=1 tr=0 a=xycr6CVXJRVtFs4WRGOeRA==:117 a=xycr6CVXJRVtFs4WRGOeRA==:17 a=DAwyPP_o2Byb1YXLmDAA:9 a=UTUPWuxJAAAA:8 a=txn80U6VlK1tgOai7JIA:9 a=CjuIK1q_8ugA:10 a=yMhMjlubAAAA:8 a=SSmOFEACAAAA:8 a=nby1dGrHpmWlqHoR3r0A:9 a=DQhTgvfcTsQJt08o:21 a=gKO2Hq4RSVkA:10 a=UiCQ7L4-1S4A:10 a=hTZeC7Yk6K0A:10 a=frz4AuCg-hUA:10 a=qF2lkv868AjrTulUL3Qw:22 To: "'Rotary motors in aircraft'" Subject: airflow characteristics-radiators and spinner Date: Tue, 9 Jul 2019 13:01:05 -0500 Message-ID: <012001d53680$476f06b0$d64d1410$@charter.net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0121_01D53656.5E9925C0" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AdU2gEEBizpgljVwQJyCCTniK5xjjw== Content-Language: en-us X-CMAE-Envelope: MS4wfB20W21wlhP85pvy36D8Xh1AT5f+ob4vtiFOy+z7d7ZcSnN0r17Y0sIDf2St6E2yFfrE3E2VXZtJhIO85Rnl4CZbaQJsvxdiqAw3pya2V+TL4LMiKKAa HJHFp6TCyBYpUl+ZsscPLAxY8fU1VJWsN3EvOf8FJOW+cU3CeJm9GhSG0yq4/vfp0Qbrz4vMD+udUg== This is a multipart message in MIME format. ------=_NextPart_000_0121_01D53656.5E9925C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 to share. [Here's a French version of the English document I found that's easier to see/read.] http://acversailles.free.fr/documentation/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 decades 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 generally less, but the airflow is greater. So a different fin pitch is appropriate for our relatively higher delta P (much higher speed through the air than a car) but lower airflows (to minimize cooling drag) applications.] ------=_NextPart_000_0121_01D53656.5E9925C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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 to share.

 

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

 

http://acversailles.free.fr/documentation/08~D= ocumentation_Generale_M_Suire/Moteur/Refroidissement/Conception/Cooling_s= ystems_for_automotive_conversion~H.Mayer.pdf

 

[I find it odd that = he misses a major point that did emerge from those decades 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 generally less, but the airflow is = greater. So a different fin pitch is appropriate for our relatively = higher delta P (much higher speed through the air than a car) but lower = airflows (to minimize cooling drag) = applications.]

 

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