X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) From: "Marc Wiese cardmarc@charter.net" Received: from [47.43.20.27] (HELO impout003.msg.chrl.nc.charter.net) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 1253742 for flyrotary@lancaironline.net; Thu, 25 Feb 2021 10:44:14 -0500 Received-SPF: pass receiver=logan.com; client-ip=47.43.20.27; envelope-from=cardmarc@charter.net Received: from [192.168.1.102] ([97.94.202.172]) by cmsmtp with ESMTPA id FIo1lIUhVr76UFIo1l19Tm; Thu, 25 Feb 2021 15:43:57 +0000 Authentication-Results: charter.net; none X-Authority-Analysis: v=2.3 cv=dotv9Go4 c=1 sm=1 tr=0 a=xycr6CVXJRVtFs4WRGOeRA==:117 a=xycr6CVXJRVtFs4WRGOeRA==:17 a=fWhaXbc1b_me0J_utMkA:9 a=QEXdDO2ut3YA:10 a=_6GpL_ENAAAA:8 a=PcrP5k77hMHAtcM8jrkA:9 a=XV8n0qOserLDJdp1:21 a=_W_S_7VecoQA:10 Content-Type: multipart/alternative; boundary=Apple-Mail-4A51F61E-FE18-4688-83E5-C1A618ADA2CF Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) Subject: Re: [FlyRotary] Re: Cowl inlet placement? Date: Thu, 25 Feb 2021 09:43:56 -0600 Message-Id: <1DFA0F9B-0909-4666-BA63-53A905E44B1B@charter.net> References: In-Reply-To: To: Rotary motors in aircraft X-Mailer: iPad Mail (18D52) X-CMAE-Envelope: MS4wfD5Hdw90NXEPAYBv0z/mahEW9VBxnhDsAvTbjGgHS3zeqz0l0ZiGheH8jCLj3vYPKBTc1L380E0yL5b7SkqSQW+vMRpoXy34ZSjaDN3JmQXJNYGDnK/T GcXMnFTW0HpKs6gwwNtnv3zrSKQHgZ8k4YhYtzBQ66vgH7ki2mEmty71Ka7vsD3bJFpD/E0uXNdhCg== --Apple-Mail-4A51F61E-FE18-4688-83E5-C1A618ADA2CF Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable > And if I do that I really should change the standard RV-4 cowl inlets to a= round ones further out in the prop wash to improve (ground) cooling.=20 Finn, Can you refer me to the literature that recommends putting the cowl inlets a= s far outward as possible? I know there is a lot of =E2=80=98common knowledg= e=E2=80=99 about this; turbulence at blade roots, downward blade wash on rig= ht inlet cause in intake turbulence, etc, etc, but I=E2=80=99ve never seen a= study or comprehensive article on inlet placement. The inlet ramping is als= o highly important.=20 Makes me wonder why the latest restart models of the Cessna=E2=80=99s didn=E2= =80=99t implement same. I know LoPresti did similar with differing success.=20= M =20 >=20 > =09 >=20 >=20 >=20 --Apple-Mail-4A51F61E-FE18-4688-83E5-C1A618ADA2CF Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
And if I do th= at I really should change the standard RV-4 cowl inlets to a round ones furt= her out in the prop wash to improve (ground) cooling. 

Finn,
Can you refer me to the literature that rec= ommends putting the cowl inlets as far outward as possible? I know there is a= lot of =E2=80=98common knowledge=E2=80=99 about this; turbulence at blade r= oots, downward blade wash on right inlet cause in intake turbulence, etc, et= c, but I=E2=80=99ve never seen a study or comprehensive article on inlet pla= cement. The inlet ramping is also highly important. 
Makes me= wonder why the latest restart models of the Cessna=E2=80=99s didn=E2=80=99t= implement same. I know LoPresti did similar with differing success. 
M   
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