X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-wy0-f180.google.com ([74.125.82.180] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTPS id 4960671 for flyrotary@lancaironline.net; Thu, 28 Apr 2011 12:06:11 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.180; envelope-from=rwstracy@gmail.com Received: by wyj26 with SMTP id 26so2241298wyj.25 for ; Thu, 28 Apr 2011 09:05:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=cBZ9z/Kda38Ym8DmjyTwgD8JYSra7nB6YlDI5c9Hamc=; b=aTNo6elbo/Z5Vvr2h0wPxQUP8ths4zlUNmguxYme+41uSYq+tK4zCdhWrCCrTFiFJi zLIkK0AdWFQojrrmQ9UfAwlat7Kmnl4wfxyeeMzSzzHEzEg2Sp2wq02iWOTtkG2LGq4W eR0oSb+A2Wp/aMOXUp5aq8Lm3C0NJ89ozno4k= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=MryeUmqdVmzawGy1IKVnNMfw0UJ3FrwFW74pzmkIQLDMIkCXNtfBikEXmYriBoR95v bwsuhjAUlus2f5pZssWD1ZAVSPMzpVusVOzg9gEnChuj5qSjcuM7IDlRrEbccOiPq21r xoc+Vl2uI6k0kCKbpit/fRuEZr+LNfePCtMsE= MIME-Version: 1.0 Received: by 10.216.221.32 with SMTP id q32mr578222wep.77.1304006734014; Thu, 28 Apr 2011 09:05:34 -0700 (PDT) Received: by 10.216.190.132 with HTTP; Thu, 28 Apr 2011 09:05:33 -0700 (PDT) In-Reply-To: References: Date: Thu, 28 Apr 2011 12:05:33 -0400 Message-ID: Subject: Re: [FlyRotary] Re: Cooling Inlets From: Tracy To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016e65b646a2a68d204a1fcbadc --0016e65b646a2a68d204a1fcbadc Content-Type: text/plain; charset=ISO-8859-1 .I was referring to what looks like pipes intruding into the diffuser inlet from the top. What are these feeding? Tom Giddings Oh, I see what you mean now. Those are little scoops that feed two 1" scat tubes that feed cool air to the alternator and a plenum around the ignition coils. The cooler you keep electrical stuff the longer it lasts. Tracy On Thu, Apr 28, 2011 at 10:33 AM, Thomas Giddings wrote: > Tracy: I will be mindful to never fly in front or in range of the inlet/ > cannon:).... Also ..I was referring to what looks like pipes intruding into > the diffuser inlet from the top. What are these feeding? > > Tom Giddings > VP Avionics Sales > MIDWEST AVIONICS > 200 Hardy Roberts Dr > PO Box 219 > West Paducah,KY 42086 > 877-904 9966 > Cell; 727 858-1772 > FAX:270 744 3466 > tom@midwestaviation.net > Online Store > www.midwest-avionics.com > > > On Apr 28, 2011, at 10:27 AM, Tracy wrote: > > Tracy: What does the smaller pipe or intake do on the top of the cowling?. > I noticed this was open at Sun N Fun( I think)I am also curious what the > pipes feed inside the plenum going to the (i think again) radiator > Tom Giddings > > That is the inlet for the throttle body. It doubles as a 70mm cannon > during dogfights : ) It will eventually get the same treatment as the > cooling inlets. > > The cooling inlets connect to the diffusers for water (on left in picture) > and oil cooler (below 70mm cannon). As has been discussed at length in the > past, the diffuser design is even more important than the inlets. > > Tracy > > > On Thu, Apr 28, 2011 at 9:15 AM, Thomas Giddings wrote: > >> Tracy: What does the smaller pipe or intake do on the top of the cowling?. >> I noticed this was open at Sun N Fun( I think)I am also curious what the >> pipes feed inside the plenum going to the (i think again) radiator >> Tom Giddings >> VP Avionics Sales >> MIDWEST AVIONICS >> 200 Hardy Roberts Dr >> PO Box 219 >> West Paducah,KY 42086 >> 877-904 9966 >> Cell; 727 858-1772 >> FAX:270 744 3466 >> tom@midwestaviation.net >> Online Store >> www.midwest-avionics.com >> >> >> On Apr 28, 2011, at 9:07 AM, Tracy wrote: >> >> Finally got around to finishing my cooling inlets. (pictures attached) Up >> until now they were simply round pipes sticking out of the cowl. The pipes >> are still there but they have properly shaped bellmouths on them. The >> shape and contours were derived from a NASA contractor report (NASA_CR3485) >> that you can find via Google. Lots of math & formulas in it but I just >> copied the best performing inlet picture of the contour. Apparently there >> is an optimum radius for the inner and outer lip of the inlet. 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. >> >> The significant change with the new inlet shape is that they appear to >> capture off-axis air flow (like in climb and swirling flow induced by prop >> at high power) MUCH better than the simple pipes. First 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. 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. At 130 >> MPH the pressure would almost double when the throttle was advanced to WOT. >> That did not happen nearly as much with the simple pipes. >> >> These inlets ROCK! >> >> Tracy Crook >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html >> >> >> > > --0016e65b646a2a68d204a1fcbadc Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable .I was referring to what looks like pipes intruding into the diffuser inlet= from the top. What are these feeding?
Tom=A0Giddings

Oh, I see what you mean now.=A0 Those are little scoo= ps that feed two 1"=A0 scat tubes that feed cool air to the alternator= and a plenum around the ignition coils.=A0 The cooler you keep electrical = stuff the longer it lasts.

Tracy

On Thu, Apr 28, 2011 at 10:33 AM, Thomas G= iddings <to= m@midwestaviation.net> wrote:
Tracy: = I will be mindful to never fly in front or in range of the inlet/ cannon:).= ... Also =A0..I was referring to what looks like pipes intruding into the d= iffuser inlet from the top. What are these feeding?

Tom=A0Giddings
VP Avionics Sales
MIDWEST AVIONICS
200 Hardy Roberts Dr
PO Box 219
West Paducah,KY= 42086
877-904 9966
Cell; 727 858-1772
FAX:270 744 3466
tom@midwestaviation.net


On Apr 28, 2011, at 1= 0:27 AM, Tracy wrote:

Tracy: What does t= he smaller pipe or intake do on the top of the=20 cowling?. I noticed this was open at Sun N Fun( I think)I am also=20 curious what the pipes feed inside the plenum going to the (i think=20 again) radiator
Tom=A0Giddings

That is the inlet for the throttle body.=A0 It double= s as a 70mm cannon during dogfights : )=A0=A0 It will eventually get the sa= me treatment as the cooling inlets.

The cooling inlets connect to th= e diffusers for water (on left in picture) and oil=A0 cooler (below 70mm ca= nnon).=A0 As has been discussed at length in the past, the diffuser design = is even more important than the inlets.

Tracy

On Thu, Apr 28, 2011 at 9:15 AM, Thomas Gi= ddings <tom@midwestaviation.net> wrote:
Tracy: W= hat does the smaller pipe or intake do on the top of the cowling?. I notice= d this was open at Sun N Fun( I think)I am also curious what the pipes feed= inside the plenum going to the (i think again) radiator
Tom=A0Giddings
VP Avionics Sales
MIDWEST AVIONICS
200 Hardy Roberts Dr
PO Box 219
West Paducah,KY= 42086
877-904 9966
Cell; 727 858-1772
FAX:270 744 3466
tom@midwestaviation.net


On Apr 28, 2011, at 9:07 AM, Tracy wrote= :

Finally got around t= o finishing my cooling inlets. (pictures attached)=A0 Up until now they wer= e simply round pipes sticking out of the cowl.=A0=A0 The pipes are still th= ere but they have properly shaped bellmouths on them.=A0=A0 The shape and c= ontours were derived from a NASA contractor report (NASA_CR3485) that you c= an find via Google.=A0 Lots of math & formulas in it but I just copied = the best performing inlet picture of the contour.=A0=A0 Apparently there is= an optimum radius for the inner and outer lip of the inlet.=A0=A0 There wa= s no change to the inlet diameters of 5.25" on water cooler and 4.75&q= uot; on oil cooler.

The simple pipes performed adequately in level flight at moderate cruis= e settings even on hot days but oil temps would quickly hit redline at high= power level flight and in climb.=A0

The significant change with th= e new inlet shape is that they appear to capture off-axis air flow=A0 (like= in climb and swirling flow=A0 induced by prop at high power)=A0 MUCH bette= r than the simple pipes. =A0=A0 First flight test was on a 94 deg. F day an= d I could not get the oil temp above 200 degrees in a max power climb. =A0= =A0 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 (2= 10 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.=A0 = At 130 MPH the pressure would almost double when the throttle was advanced = to WOT. =A0 That did not happen nearly as much with the simple pipes.=A0=A0=

These inlets ROCK!

Tracy Crook


<= div style=3D"padding:0px;margin-left:0px;margin-top:0px;overflow:hidden;wor= d-wrap:break-word;color:black;font-size:10px;text-align:left;line-height:13= 0%">
<inlets_front.jpg><RtInlet.jpg><= /span>--
Homepage: =A0http://www.flyrotary.com/
Archive and UnSub: =A0=A0http://mail.lancaironline.net:81/lists/flyrotary/List.html




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