X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost06.isp.att.net ([204.127.217.106] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4913001 for flyrotary@lancaironline.net; Sun, 20 Mar 2011 19:59:54 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.217.106; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-85-145-79.mco.bellsouth.net[98.85.145.79]) by isp.att.net (frfwmhc06) with SMTP id <20110320235919H0600e8n2ve>; Sun, 20 Mar 2011 23:59:20 +0000 X-Originating-IP: [98.85.145.79] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: On the subject of installations... Date: Sun, 20 Mar 2011 19:59:22 -0400 Message-ID: <072CF65853A7412E8DC82AEC7973F780@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0000_01CBE739.4EBAFAE0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcvnU9FNL4H1ie5NRnqobWPKF3j94gABqwsg X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01CBE739.4EBAFAE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit That is a good point, Steve, but the real info in the data was the fact that there was no pressure difference between the inlet and outlet side of the radiator. After the pressure built in the cowl to whatever point, the pressure then stayed the same all the way to the inlet of the nostril. No more could come in because there was no place for it to go. Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Steven W. Boese Sent: Sunday, March 20, 2011 7:08 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: On the subject of installations... Bill, It might be useful to check the calibration and sensitivity of the pressure measuring device. 10" of Hg is a lot of pressure to see from ram air. 10" of water would seem more reasonable. It would be a shame to make ineffective modifications because of questionable data. Steve From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry Sent: Sunday, March 20, 2011 3:29 PM To: Rotary motors in aircraft Subject: [FlyRotary] On the subject of installations... My water temp has been running between 199 and 217, depending on the OAT. The oil is pretty steady at around 175. Today I finally got to fly with pressure probes inside the cowling. I was all set to try and enlarge the inlet to the radiator to solve the problem. It turns out that "in" is not the problem, it is "out" that is the problem! I have 10 inches of Hg pressure in the radiator inlet and 10 inches of Hg on the outlet side as well as the same pressure everywhere I measured inside the cowl. I need to open up the cowl some so more air can get out. I had considered a cowl flap but that would not work in this instance because the problem is at cruise. I need a permanent opening. I am considering louvers and I am looking for a source. I know some of you are using them. Where did you get them and how are they installed so that they look ok? I am also considering some kind of flare around the exit area to create a low pressure area to help suck air out. Do any of you have those and do they seem to work? While I look into this, I also need to do something about my muffler.Thank you, Bobby! I wonder about that spiral muffler some of you are trying?? Bill B 9 hours and counting. By the way, I was considering putting a 1 or 2 inch wide piece of cardboard across the bottom of the oil cooler to partially block it in the hopes that more air would then flow through the radiator. Sort of like truckers do with the radiator in cold weather. What opinions do you have about that idea? I realize it would make more sense if the oil was really cool, but I think the oil might not get much hotter if an inch or so was blocked. What do you think??? ------=_NextPart_000_0000_01CBE739.4EBAFAE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

That is a good point, Steve, but = the real info in the data was the fact that there was no pressure difference = between the inlet and outlet side of the radiator.  After the pressure built in = the cowl to whatever point, the pressure then stayed the same all the way to = the inlet of the nostril.  No more could come in because there was no = place for it to go.

 

Bill B

 

From: = Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On Behalf Of Steven W. = Boese
Sent: Sunday, March 20, = 2011 7:08 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = On the subject of installations...

 

Bill,

 

=

It might be useful to check the calibration and sensitivity of the pressure measuring device.  = 10” of Hg is a lot of pressure to see from ram air.  10” of water = would seem more reasonable.  It would be a shame to make ineffective modifications because of questionable data.

 

=

Steve

 

=

 <= /o:p>

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Sunday, March 20, = 2011 3:29 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] On = the subject of installations...

 

My water temp has been running = between 199 and 217, depending on the OAT.  The oil is pretty steady at around 175.  Today I finally got to fly with pressure probes inside the cowling.  I was all set to try and enlarge the inlet to the = radiator to solve the problem.  It turns out that “in” is not the = problem, it is “out” that is the = problem!

 

I have 10 inches of Hg pressure in = the radiator inlet and 10 inches of Hg on the outlet side as well as the = same pressure everywhere I measured inside the cowl.  I need to open up = the cowl some so more air can get out.  I had considered a cowl flap = but that would not work in this instance because the problem is at cruise.  = I need a permanent opening.  I am considering louvers and I am looking for = a source.  I know some of you are using them.  Where did you get = them and how are they installed so that they look = ok?

 

I am also considering some kind of = flare around the exit area to create a low pressure area to help suck air = out.  Do any of you have those and do they seem to = work?

 

While I look into this, I also need = to do something about my muffler…Thank you, = Bobby!

 

I wonder about that spiral muffler = some of you are trying??

 

Bill B  9 hours and = counting…

 

By the way, I was considering = putting a 1 or 2 inch wide piece of cardboard across the bottom of the oil cooler to partially block it in the hopes that more air would then flow through = the radiator.  Sort of like truckers do with the radiator in cold = weather.  What opinions do you have about that idea?  I realize it would make = more sense if the oil was really cool, but I think the oil might not get much = hotter if an inch or so was blocked.  What do you = think???

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