X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 10 Oct 2013 15:49:08 -0400 Message-ID: X-Original-Return-Path: Received: from p3plex2out02.prod.phx3.secureserver.net ([184.168.131.14] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6510221 for lml@lancaironline.net; Thu, 10 Oct 2013 14:10:26 -0400 Received-SPF: none receiver=logan.com; client-ip=184.168.131.14; envelope-from=pete@leapfrogventures.com Received: from P3PW5EX1HT005.EX1.SECURESERVER.NET ([72.167.180.47]) by p3plex2out02.prod.phx3.secureserver.net with secureserver.net id bW9n1m00F11lQaG01W9qdH; Thu, 10 Oct 2013 11:09:50 -0700 Received: from P3PW5EX1MB14.EX1.SECURESERVER.NET ([10.6.135.86]) by P3PW5EX1HT005.EX1.SECURESERVER.NET ([72.167.180.134]) with mapi; Thu, 10 Oct 2013 11:09:33 -0700 From: "pete@leapfrogventures.com" X-Original-To: "William A. Hogarty" , Lancair Mailing List X-Original-Date: Thu, 10 Oct 2013 11:09:31 -0700 Subject: RE: [LML] Removing vacuum pump? Thread-Topic: [LML] Removing vacuum pump? Thread-Index: Ac7Fn7xzRp7JegXeTOWrF7+5bSxI7gAQ9wkA X-Original-Message-ID: <2A14E6258A8534418F5498D73CCA51EF2257AF0B76@P3PW5EX1MB14.EX1.SECURESERVER.NET> 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_2A14E6258A8534418F5498D73CCA51EF2257AF0B76P3PW5EX1MB14E_" MIME-Version: 1.0 --_000_2A14E6258A8534418F5498D73CCA51EF2257AF0B76P3PW5EX1MB14E_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable The Lancair wiring diagram shows an interconnect switch between the landing= gear and the pressurization system. IMHO, this is a complete waste of com= plexity. Because there is no backflow valve on the pressure inlet from the= intercoolers, once you pull the power below 20 MAP the cabin will complete= ly depressurize. Pete From: William A. Hogarty [mailto:billhogarty@gmail.com] Sent: Wednesday, October 09, 2013 5:14 PM To: Lancair Mailing List Subject: Re: [LML] Removing vacuum pump? I understood that the outflow valve was grounded whenever the gear switch w= as down. Is this wrong? Bill Hogarty On Wed, Oct 9, 2013 at 9:13 AM, Craig Berland > wrote: I have an all-electric airplane as well and chose to not have any vacuum su= pplied to the Dukes valve. The only difference is the rate in which pressu= rization starts building in the cabin on takeoff roll. Once airborne, vacu= um has no effect on the pressurization system. I choose to apply power a = little more slowly than some pilots. This prevents any pressurization disc= omfort and typically I don't need any right brake to hold centerline. Take= off distance is not an issue. If I can land there, I can easily takeoff th= ere. I know one pilot who has developed an electronic circuit to control a= small electric vacuum pump based on the landing gear position. So there a= re several options. In my opinion, keeping the engine driven pump is the l= east desirable. Craig Berland N7VG Hello Dico, You will need a vacuum port to the Dukes pressure valve for the pressurizat= ion to work correctly, I do not have any gyro instruments either but I need= ed to install an electric vacuum pump near the Dukes valve Kamal T N1104T -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html --_000_2A14E6258A8534418F5498D73CCA51EF2257AF0B76P3PW5EX1MB14E_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

The Lancair wiring diagram shows an = interconnect switch between the landing gear and the pressurization system.=   IMHO, this is a complete waste of complexity.  Because there is no ba= ckflow valve on the pressure inlet from the intercoolers, once you pull the= power below 20 MAP the cabin will completely depressurize.

 

Pete

 

From: William A. Hogarty [mailto:billhogarty@gmail.com]
Sent: Wednesday, October 09, 2013 5:14 PM
<= b>To: Lancair Mailing List
<= b>Subject: Re: [LML] Removing v= acuum pump?

 

I understood that the outfl= ow valve was grounded whenever the gear switch was down.<= /font>

 

=

Is this wrong?

 

<= p class=3DMsoNormal>Bill Hogarty

 =

cberla= nd@systems3.net> wrote:

I have an all-electric airplane as well and chose to not have any vacuum= supplied to the Dukes valve.  The only difference is the rate in whic= h pressurization starts building in the cabin on takeoff roll.  Once a= irborne, vacuum has no effect on the pressurization system.   I choose= to apply power a little more slowly than some pilots.  This prevents = any pressurization discomfort and typically I don't need any right brake to= hold centerline.  Takeoff distance is not an issue.  If I can la= nd there, I can easily takeoff there.  I know one pilot who has develo= ped an electronic circuit to control a small electric vacuum pump based on = the landing gear position.  So there are several options.  In my = opinion, keeping the engine driven pump is the least desirable.

Crai= g Berland
N7VG


Hello Dico,
You will need a vacuum port to = the Dukes pressure valve for the pressurization to work correctly, I do not= have any gyro instruments either but I needed to install an electric vacuu= m pump near the Dukes valve
Kamal T
N1104T




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