X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 17 May 2014 11:41:56 -0400 Message-ID: X-Original-Return-Path: Received: from nm50-vm8.bullet.mail.bf1.yahoo.com ([216.109.115.239] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6877542 for lml@lancaironline.net; Sat, 17 May 2014 10:57:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.109.115.239; envelope-from=chris_zavatson@yahoo.com Received: from [66.196.81.172] by nm50.bullet.mail.bf1.yahoo.com with NNFMP; 17 May 2014 14:56:34 -0000 Received: from [98.139.212.202] by tm18.bullet.mail.bf1.yahoo.com with NNFMP; 17 May 2014 14:56:34 -0000 Received: from [127.0.0.1] by omp1011.mail.bf1.yahoo.com with NNFMP; 17 May 2014 14:56:34 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 669063.88371.bm@omp1011.mail.bf1.yahoo.com Received: (qmail 69476 invoked by uid 60001); 17 May 2014 14:56:34 -0000 X-YMail-OSG: ZEx0Ph0VM1mizQAMt0z21QBgEYEvo..4haHFUAWUIC8CmS9 881u0zDri7czzaEyRj_sDmizfovCb_pyM7XpsxH00W75AGOkE68ymdwri_u_ J15BsW6Ua074abZjsz08FVcwqTvJbtsYgqOaT1j5_H_54ozGneQZzaK0y7FY 26hN4qkM2trPCCFdvVoIQDwba9BOjT2v9oNdOsG4tUyWAKiT3N4qKTsrxiGF H2WbwpBnA.3kssPF9_wWrXRojfhcNVtDidDREKX_SONHSHgsrFtPyRjmN__L QxCz_sJjPtbS8WiB_1CDKHo23e85md8IBtnQDJSyV1J0OzMMgDHQZqIoY5KA LRAZ45FhUAOq6ljAko7nk5A8Kdl4.BrEgbngPQP56jhqwg_mbtKUmDocMOyN tAGkZBzo5t3Aqvk_mBqeNHQcMkQew4OriMyQSgg7dnGTwjwwLapWS8WSLp5C gIXndmUIlc5PUyPZxkyXdsZP7KGIIj5HywWv.ySX7B8i_t5ZKog.n43QaT_M YB8IHFEcx0tQcvrbFS6fXWpvmde.DDjSEHPOTESVL27rP56vI8zk0akg29Ev eJcOpUht.hUqgz_46_ZJOPC4lF5zYdf6S23GvssKnFEBFwg_ojdrrmsBfnJN CJ1qNmrDxs1IHt_HtQelXgJNOLBiDaGArD01BlyffqQOyiG9qkSslKkMOT5f cAU.9p4khR..wc2ngaLWLkFRRx9hIDugdVJ.1K.ecZjkSz9sR4Cmmb..8gSe 7CN4xhAzJhM1ec5Rzl66wS9u.QYvYAE0w Received: from [172.14.16.72] by web161201.mail.bf1.yahoo.com via HTTP; Sat, 17 May 2014 07:56:34 PDT X-Rocket-MIMEInfo: 002.001,QW5naWVyLApUaGlzIGNhbiBnZXQgYSBsaXR0bGUgaW52b2x2ZWQgLSBhbGwgdmVyeSBkb2FibGUgaG93ZXZlci7CoCBUbyBzZWUgd2hhdCBpcyBnb2luZyBvbiB1bmRlciB0aGUgaG9vZCwgSSB3b3VsZCBzdWdnZXN0IGZvbGxvd2luZyBhbG9uZyBhbmQgcmVwbGljYXRpbmcgdGhlIG1lYXN1cmVtZW50cyB0YWtlbiBpbiB0aGlzIHJlcG9ydDoKaHR0cDovL245MWN6LmNvbS9QcmVzc3VyZS9QbGVudW1QcmVzc3VyZS5wZGYKWW91IGFyZSBiYXNpY2FsbHkgbG9va2luZyBmb3IgdHdvIHRoaW5ncy7CoCBGaXJzdCABMAEBAQE- X-Mailer: YahooMailWebService/0.8.188.663 References: X-Original-Message-ID: <1400338594.18322.YahooMailNeo@web161201.mail.bf1.yahoo.com> X-Original-Date: Sat, 17 May 2014 07:56:34 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Re: 360 Plenum X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="1261493821-1230120604-1400338594=:18322" --1261493821-1230120604-1400338594=:18322 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Angier,=0AThis can get a little involved - all very doable however.=C2=A0 T= o see what is going on under the hood, I would suggest following along and = replicating the measurements taken in this report:=0Ahttp://n91cz.com/Press= ure/PlenumPressure.pdf=0AYou are basically looking for two things.=C2=A0 Fi= rst is how much pressure recovery you are obtaining above the engine and th= en secondly=C2=A0how much leakage you have bypassing the engine.=C2=A0 The = pressure drop vs. mass flow curve for standard Lycoming cylinders is availa= ble.=C2=A0 The problem is that one needs an independent measurement of the = mass flow to look for leaks.=C2=A0 If you just measure pressure drop across= the engine, you will get that mass flow, but there might be other paths pr= esent.=0AI used a pitot tube in the throat of the inlet to get a second sou= rce for mass flow.=C2=A0 My oil cooler uses upper plenum air, so I also had= to=C2=A0measure the mass flow through the oil cooler as well.=C2=A0 In the= end, all the numbers lined up so I had confidence of good sealing.=0AFrank= Motts (Lycoming) has a good paper that walks through all the calculations = required to determine the losses in terms of power in the system.=C2=A0 Ins= trumenting the plane is the most tedious part.=C2=A0 Testing itself is quic= k.=0A=0AChris Zavatson=0AN91CZ=0A360std=0Awww.N91CZ.net=0AOn Thursday, May = 15, 2014 6:34 PM, "Greenbacks, UnLtd." wrote:=0A =0A=0A= =0AChris,=0A=0AI think my plenum captures every molecule of incoming air an= d puts them to useful work=E2=80=A6=C2=A0 :-)=0APlease let me know the best= =0A procedure for testing my theory.=0A=0AAngier Ames=0AN4ZQ=0A=0A=0A--=0AF= or archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html --1261493821-1230120604-1400338594=:18322 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Angier,
This can get a little involved - all very doa= ble however.  To see what is going on under the hood, I would suggest = following along and replicating the measurements taken in this report:
You are basically looking for two things.&nbs= p; First is how much pressure recovery you are=0A obtaining above the engin= e and then secondly how much leakage you have bypassing the engine.&nb= sp; The pressure drop vs. mass flow curve for standard Lycoming cylinders i= s available.  The problem is that one needs an independent measurement= of the mass flow to look for leaks.  If you just measure pressure dro= p across the engine, you will get that mass flow, but there might be other = paths present.
I us= ed a pitot tube in the throat of the inlet to get a second source for mass = flow.  My oil cooler uses upper plenum air, so I also had to meas= ure the mass flow through the oil cooler as well.  In the end, all the= numbers lined up so I had confidence of good sealing.
Frank Mot= ts (Lycoming) has a good paper that walks through all the calculations requ= ired to determine the losses in terms of power in the system.  Instrum= enting the plane is the most tedious part.  Testing itself is quick.

Chris Zavatso= n
N91CZ
360std
www.N91CZ.net
<= div dir=3D"ltr"> On Thursday, May 15, 2014= 6:34 PM, "Greenbacks, UnLtd." <N4ZQ@VERIZON.NET> wrote:


Chris,

I think my plenum captures every molecule of incoming= air and puts them to useful work=E2=80=A6  :-)
Plea= se let me know the best=0A procedure for testing my theory.

Angier Ames
N4ZQ
=

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For archives and= unsub http://mail.lancaironline.n= et:81/lists/lml/List.html

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