X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) X-Junk-Score: 0 [] X-KAS-Score: 0 [] From: "Marc Wiese cardmarc@charter.net" Received: from [47.43.20.31] (HELO impout007.msg.chrl.nc.charter.net) by logan.com (CommuniGate Pro SMTP 6.3.5) with ESMTPS id 154184 for flyrotary@lancaironline.net; Tue, 20 Jul 2021 16:49:01 -0400 Received-SPF: pass receiver=logan.com; client-ip=47.43.20.31; envelope-from=cardmarc@charter.net Received: from smtpclient.apple ([174.202.203.34]) by cmsmtp with ESMTPA id 5wfUmuPnH5d1D5wfUm3g6S; Tue, 20 Jul 2021 20:48:45 +0000 Authentication-Results: charter.net; auth=pass (PLAIN) smtp.auth=cardmarc@charter.net X-Authority-Analysis: v=2.4 cv=eP7WMFl1 c=1 sm=1 tr=0 ts=60f736ad a=wuZb5LKXEFYg6oTVAQWxDQ==:117 a=wuZb5LKXEFYg6oTVAQWxDQ==:17 a=o1OHuDzbAAAA:8 a=Ia-xEzejAAAA:8 a=pGLkceISAAAA:8 a=_6GpL_ENAAAA:8 a=7g1VtSJxAAAA:8 a=xkA-rE2rddztNth2fvMA:9 a=QEXdDO2ut3YA:10 a=Tr8nuKu5vpAA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=sryRntWWE9MhEBkMQwMA:9 a=K2wNzwyuxRGQcprh:21 a=_W_S_7VecoQA:10 a=5YQ6H4ZxyGn-KoBYtt8s:22 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 Content-Type: multipart/alternative; boundary=Apple-Mail-691BC05A-119C-4A9D-8570-145DE0797C6B Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) Subject: Re: [FlyRotary] Fwd: [FlyRotary] Re: Cooling Inlets Date: Tue, 20 Jul 2021 15:48:43 -0500 Message-Id: <48A35435-018F-4869-B82C-0DDE6337213A@charter.net> References: In-Reply-To: To: Rotary motors in aircraft X-Mailer: iPad Mail (18F72) X-CMAE-Envelope: MS4xfEShoq2BqVCm5I4wsQKJff39yAyRom/evIVP+tVNXyZCMvOsXwfUVxzaR51cpO0clrfk9+bPZ9yLnsYX0qcW6bI+MVbjibJdDZo/S5WM5nvszoe+STlC hSj+QCxclvMativo+xPsFgq8hGzbLNxQmQmGiwps1Y4iKgxK470bI3jAKeshWEMzaGEG7z2rPoEeLpNKZp4uBIxfYZ/7uKV4zx0= --Apple-Mail-691BC05A-119C-4A9D-8570-145DE0797C6B Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Wow. What=E2=80=99s the clearance to the prop rear edge? Is there a plenum o= r using the cowl? M Sent from my iPad > On Jul 20, 2021, at 12:52 PM, Finn Lassen finn.lassen@verizon.net wrote: >=20 > =EF=BB=BF > OK, archive search function sucks (or at least I can't figure it out). So h= ere goes. >=20 > Finn >=20 > -------- Forwarded Message -------- > Subject: [FlyRotary] Re: Cooling Inlets > Date: Thu, 28 Apr 2011 09:07:43 -0400 > From: Tracy > Reply-To: Rotary motors in aircraft > To: Rotary motors in aircraft >=20 >=20 > Finally got around to finishing my cooling inlets. (pictures attached)=C3=AF= =C2=BF=C2=BD Up until now they were simply round pipes sticking out of the c= owl.=C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD The pipes are still there but they h= ave properly shaped bellmouths on them.=C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD T= he shape and contours were derived from a NASA contractor report (NASA_CR348= 5) that you can find via Google.=C3=AF=C2=BF=C2=BD Lots of math & formulas i= n it but I just copied the best performing inlet picture of the contour.=C3=AF= =C2=BF=C2=BD=C3=AF=C2=BF=C2=BD Apparently there is an optimum radius for the= inner and outer lip of the inlet.=C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD There= was no change to the inlet diameters of 5.25" on water cooler and 4.75" on o= il cooler. >=20 > The simple pipes performed adequately in level flight at moderate cruise s= ettings even on hot days but oil temps would quickly hit redline at high pow= er level flight and in climb.=C3=AF=C2=BF=C2=BD=20 >=20 > The significant change with the new inlet shape is that they appear to cap= ture off-axis air flow=C3=AF=C2=BF=C2=BD (like in climb and swirling flow=C3= =AF=C2=BF=C2=BD induced by prop at high power)=C3=AF=C2=BF=C2=BD MUCH better= than the simple pipes. =C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD First flight te= st was on a 94 deg. F day and I could not get the oil temp above 200 degrees= in a max power climb. =C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD They may have go= ne higher if the air temperature remained constant but at 3500 fpm the rapid= ly decreasing OAT kept the temps well under redline (210 deg F). >=20 > I have an air pressure instrument reading the pressure in front of the oil= cooler and was amazed at the pressure recovered from the prop wash.=C3=AF=C2= =BF=C2=BD At 130 MPH the pressure would almost double when the throttle was a= dvanced to WOT. =C3=AF=C2=BF=C2=BD That did not happen nearly as much with t= he simple pipes.=C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD=20 >=20 > These inlets ROCK! >=20 > Tracy Crook >=20 >=20 >=20 > Virus-free. www.avast.com > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List= .html --Apple-Mail-691BC05A-119C-4A9D-8570-145DE0797C6B Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Wow. What=E2=80=99s the clearance to the pr= op rear edge? Is there a plenum or using the cowl?
M

Sent from my iPad

O= n Jul 20, 2021, at 12:52 PM, Finn Lassen finn.lassen@verizon.net <flyrota= ry@lancaironline.net> wrote:

=EF=BB=BF =20 =20 =20

OK, archive search function sucks (or at least I can't figure it out). So here goes.

Finn

-------- Forwarded Message --------
Subjec= t: [FlyRotary] Re: Cooling Inlets
Date: <= /th> Thu, 28 Apr 2011 09:07:43 -0400
From: <= /th> Tracy <rwstracy@gmail.com>
Reply-= To: Rotary motors in aircraft <flyrotary@lancaironline.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>


Finally go= t around to finishing my cooling inlets. (pictures attached)=C3=AF= =C2=BF=C2=BD Up until now they were simply round pipes sticking out of the cowl.=C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD The pipes are stil= l there but they have properly shaped bellmouths on them.=C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD T= he shape and contours were derived from a NASA contractor report (NASA_CR3485) that you can find via Google.=C3=AF=C2=BF=C2=BD Lots of math & formul= as in it but I just copied the best performing inlet picture of the contour.=C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD Apparently there is= an optimum radius for the inner and outer lip of the inlet.=C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2= =BD There was no change to the inlet diameters of 5.25" on water cooler and 4.75" on oil cooler.

The simple pipes performed adequately in level flight at moderate cruise settings even on hot days but oil temps would quickly hit redline at high power level flight and in climb.=C3=AF=C2=BF=C2=BD

The significant change with the new inlet shape is that they appear to capture off-axis air flow=C3=AF=C2=BF=C2=BD (like in c= limb and swirling flow=C3=AF=C2=BF=C2=BD induced by prop at high power)=C3= =AF=C2=BF=C2=BD MUCH better than the simple pipes. =C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD Firs= t flight test was on a 94 deg. F day and I could not get the oil temp above 200 degrees in a max power climb. =C3=AF=C2=BF=C2=BD=C3=AF=C2=BF=C2=BD They may= have gone higher if the air temperature remained constant but at 3500 fpm the rapidly decreasing OAT kept the temps well under redline (210 deg F).

I have an air pressure instrument reading the pressure in front of the oil cooler and was amazed at the pressure recovered from the prop wash.=C3=AF=C2=BF=C2=BD At 130 MPH the p= ressure would almost double when the throttle was advanced to WOT. =C3=AF=C2=BF= =C2=BD That did not happen nearly as much with the simple pipes.=C3=AF=C2=BF= =C2=BD=C3=AF=C2=BF=C2=BD

These inlets ROCK!

Tracy Crook

3D"" Virus-free. ww= w.avast.com
<inlets_front.jpg>
<RtInlet.jpg>
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