X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from aspensprings.uwyo.edu ([129.72.10.32] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTPS id 4912906 for flyrotary@lancaironline.net; Sun, 20 Mar 2011 19:09:05 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht2.uwyo.edu (ponyexpress-ht2.uwyo.edu [10.84.60.209]) by aspensprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id p2KN8H0p018478 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Sun, 20 Mar 2011 17:08:28 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-mb5.uwyo.edu ([fe80::9813:248c:2d68:a28b]) by ponyexpress-ht2 ([10.84.60.209]) with mapi; Sun, 20 Mar 2011 17:08:28 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Date: Sun, 20 Mar 2011 17:08:19 -0600 Subject: RE: [FlyRotary] On the subject of installations... Thread-Topic: [FlyRotary] On the subject of installations... Thread-Index: AcvnRfIfOJeSzwB4Qfy4qJXwCib4CwAC2A7w Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_E1AA3B1AF41D8049B1E3FBD5E225626008892DF910ponyexpressmb_" MIME-Version: 1.0 --_000_E1AA3B1AF41D8049B1E3FBD5E225626008892DF910ponyexpressmb_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 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 ineffec= tive modifications because of questionable data. Steve From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf 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 pr= essure probes inside the cowling. I was all set to try and enlarge the inl= et 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 o= n 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 th= e problem is at cruise. I need a permanent opening. I am considering louv= ers and I am looking for a source. I know some of you are using them. Whe= re 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 l= ow pressure area to help suck air out. Do any of you have those and do the= y seem to work? While I look into this, I also need to do something about my muffler...Than= k 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 tha= t 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 id= ea? I realize it would make more sense if the oil was really cool, but I t= hink the oil might not get much hotter if an inch or so was blocked. What = do you think??? --_000_E1AA3B1AF41D8049B1E3FBD5E225626008892DF910ponyexpressmb_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bill,

 

It might be useful to check the cali= bration and sensitivity of the pressure measuring device.  10” o= f Hg is a lot of pressure to see from ram air.  10” of water wou= ld seem more reasonable.  It would be a shame to make ineffective modi= fications because of questionable data.

&n= bsp;

Steve

<= /span>

 

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

 

My water temp has been running between 199 and 217, de= pending on the OAT.  The oil is pretty steady at around 175.  Tod= ay I finally got to fly with pressure probes inside the cowling.  I wa= s 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 w= ell as the same pressure everywhere I measured inside the cowl.  I nee= d 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 louver= s and I am looking for a source.  I know some of you are using them.&n= bsp; Where did you get them and how are they installed so that they look ok= ?

 

<= p class=3DMsoNormal>I am also considering some kind of flare around the e= xit area to create a low pressure area to help suck air out.  Do any o= f 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, B= obby!

 <= /p>

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

 

Bill B  9 hours and counting…

 

By the way, I was considering putting a 1 or 2 inch wide p= iece 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.  Sor= t of like truckers do with the radiator in cold weather.  What opinion= s 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 a= n inch or so was blocked.  What do you think???

<= /div>
= --_000_E1AA3B1AF41D8049B1E3FBD5E225626008892DF910ponyexpressmb_--