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 5.4.4) with ESMTPS id 5483264 for flyrotary@lancaironline.net; Mon, 16 Apr 2012 10:52:45 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht4.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) by aspensprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id q3GEq2Fb026072 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Mon, 16 Apr 2012 08:52:02 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-ht4.uwyo.edu ([fe80::8de7:b225:a85b:d0ee%13]) with mapi id 14.01.0339.001; Mon, 16 Apr 2012 08:50:35 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Just basic questions here Thread-Topic: [FlyRotary] Just basic questions here Thread-Index: AQHNG3Fz6ICg0gDk9kO0UA+lCtwLspadgQ/v Date: Mon, 16 Apr 2012 14:50:34 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05C40F20@ponyexpress-m10.uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [75.220.114.87] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05C40F20ponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05C40F20ponyexpressm10u_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Randy, If you are trying to check the EM3 airspeed indication, it would be good to= connect your manometer to the EM3 pitot connection right on the EM3 and le= ave the other EM3 ports unconnected. The manometer would be connected to n= othing else. From your description, it is possible that you were connected= to the static system instead of the pitot port of the EM3. The static sys= tem is probably connected to several locations including the static ports o= n the outside of the airframe which would act as leaks. If you are trying = to check the overall installation, it would be best to connect the manomete= r to the pitot or static ports on the outside of the airframe without chang= ing anything anywhere in the plumbing of the system. Concerning the radiator questions, the location of the radiator 4 inches (o= r more) below anything else in the system would not be a problem. Four inc= hes of water column generates less than 0.2 psi of pressure. I would expec= t that the EM3 is indicating pressure in psi, not inches of water (or Hg). = A 15 psi radiator cap would hold 416 inches of water column if it is worki= ng correctly. If you have a 14-15 psi radiator cap on the radiator and the pressure senso= r for the EM3 is located where it indicates the pressure on the inlet to th= e radiator, then the pressure reading of 17 and the radiator cap venting ma= kes sense. This may be the result of the restriction of the radiator causi= ng a build up of pressure in excess of the radiator cap capability. The wa= ter pump in my 13B is capable of pressures in excess of 40 psi at cruise RP= M if the flow is restricted. If there is a radiator cap somewhere else in = the system other than between the water pump outlet and the radiator, then = the cap on the radiator can be replaced with a non-venting cap rather than = trying to increase the venting pressure of the one installed there now. FWIW Steve Boese RV6A, 1986 13B NA, RD1A, EC2 ________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of = Randolph [randolph7714@comcast.net] Sent: Sunday, April 15, 2012 7:36 PM To: Rotary motors in aircraft Subject: [FlyRotary] Just basic questions here I'm finishing up ground runs on my 1988 13B using the EM3 EC3 before closin= g everything up to install the biplane wings.. Wanted to be sure the 5/32" ID silicon tube was connected to the right plac= e in the AQM. I configured a manometer to the steam gages in the front and= rear cockpits an observed about 3.3 inches of water gives a reading of 80 mph. So far so= good. Then I tried to check what this pressure would do with the aqm (EM3= ) and found no change in the near zero true air speed EM3 reading. In fact there seems to be a blee= d-off of pressure so I cannot hold a steady 3.3" pressure on the EM3 to mea= sure anything. Did I spend $ 28 to get this silicon tube for naught or am = I confused about the one pitot and two static ports on this AQM? And then again..the water temp was about 165 without the cowl, but on the l= atest ground run the temp ran 188 degrees and climbing..gurss ya have to f= ly in to know...problem is the three pass19" X 20" X 2" radiator is some fo= ur inches below the steam chamber and water fill cap so at 17 inches of pre= ssure indicated (EM3) coolent spewes out liberally from the radiator cap.. = Can I add rubber washers to this cap or should I toss it away and weld up= that racing radiator cap location? The water after radiator temp register= ed 30 degrees below the engine out water.. is this enough? Wishing you all had problems so basic as mine! Randy __________ Information from ESET NOD32 Antivirus, version of virus signatur= e database 7056 (20120415) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com --_000_3E8191F276108F4481AB0721BBA9269E05C40F20ponyexpressm10u_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Randy,

 

If you are trying to check the EM3 airspeed indication, it w= ould be good to connect your manometer to the EM3 pitot= connection right on the EM3 and leave the other EM3 ports unconnected.  The manometer would be connected to nothing else.  From your description, it is possible that you were= connected to the static system instead of the pitot port of th= e EM3.  The static system is probably connected to several loca= tions including the static ports on the outside of the airframe which would act as leaks.  If you are trying to check= the overall installation, it would be best to connect the manometer to the=  pitot or static ports on the outside of the airframe= without changing anything anywhere in the plumbing of the system.

 

Concerning the radiator questions, the location of the radiator 4 inches= (or more) below anything else in the system would not be a problem.  = Four inches of water column generates less than 0.2 psi of pressure.  = I would expect that the EM3 is indicating pressure in psi, not inches of water (or Hg).  A 15 psi radiator cap = would hold 416 inches of water column if it is working correctly. 

 

If you have a 14-15 psi radiator cap on the radiator and the pressu= re sensor for the EM3 is located where it indicates the pressur= e on the inlet to the radiator, then the pressure reading of 17 and the rad= iator cap venting makes sense.  This may be the result of the restriction of the radiator causing a build up of pressu= re in excess of the radiator cap capability.  The water pump in my&nbs= p;13B is capable of pressures in excess of 40 psi at cruise RPM = ;if the flow is restricted.  If there is a radiator cap somewhere else in the system other than between the water pump ou= tlet and the radiator, then the cap on the radiator can be replaced wi= th a non-venting cap rather than trying to increase the venting pressure of= the one installed there now.

 

FWIW

 

Steve Boese
RV6A, 1986 13B NA, RD1A, EC2

 

 

From: Rotary motors in aircraft [flyrotary= @lancaironline.net] on behalf of Randolph [randolph7714@comcast.net]
Sent: Sunday, April 15, 2012 7:36 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Just basic questions here

I'm= finishing up ground runs on my 1988 13B using the EM3 EC3 before closing e= verything up to install the biplane wings..
Wan= ted to be sure the 5/32" ID silicon tube was connected to the right pl= ace in the AQM.  I configured a manometer to the steam gages in the fr= ont and rear cockpits
an = observed about 3.3 inches of water gives a reading of 80 mph.  So far = so good.  Then I tried to check what this pressure would do with the a= qm (EM3) and found no change in
the= near zero true air speed EM3 reading.  In fact there seems to be a bl= eed-off of pressure so I cannot hold a steady 3.3" pressure on th= e EM3 to measure anything.  Did I spend $ 28 to get this silicon tube for naught or am I confused about the one pitot and two stati= c ports on this AQM?
 
And= then again..the water temp was about 165 without the cowl, but on the late= st ground  run the temp ran 188 degrees and climbing..gurss ya have to= fly in to know...problem is the three pass19" X 20" X 2" radiator is some four inches below the steam chamber = and water fill cap so at 17 inches of pressure indicated (EM3) coolent spew= es out liberally from the radiator cap..  Can I add rubber washers to = this cap or should I toss it away  and weld up that racing radiator cap location?  The water after radiator temp reg= istered 30 degrees below the engine out water.. is this enough?
 
Wis= hing you all had problems so basic as mine!
 
Ran= dy


__________ Information from ESET NOD32 Antivirus, version of virus signatur= e database 7056 (20120415) __________

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