X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 11 Oct 2013 07:52:30 -0400 Message-ID: X-Original-Return-Path: Received: from mail-ob0-f180.google.com ([209.85.214.180] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6510663 for lml@lancaironline.net; Thu, 10 Oct 2013 18:45:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.214.180; envelope-from=toddlong1@gmail.com Received: by mail-ob0-f180.google.com with SMTP id wn1so2201621obc.39 for ; Thu, 10 Oct 2013 15:44:54 -0700 (PDT) X-Received: by 10.182.66.164 with SMTP id g4mr96224obt.47.1381445094214; Thu, 10 Oct 2013 15:44:54 -0700 (PDT) X-Original-Return-Path: Received: from [10.229.246.134] (88.sub-174-230-194.myvzw.com. [174.230.194.88]) by mx.google.com with ESMTPSA id y1sm90627273oek.4.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 10 Oct 2013 15:44:53 -0700 (PDT) Subject: Re: [LML] Re: Removing vacuum pump? References: From: Todd Long Content-Type: multipart/alternative; boundary=Apple-Mail-AC2D59D8-4119-488F-B9FA-E1DD7FF6FC72 X-Mailer: iPhone Mail (11A501) In-Reply-To: X-Original-Message-Id: <5E494355-71C8-449C-8BC6-610BE3ACA56B@gmail.com> X-Original-Date: Thu, 10 Oct 2013 17:44:40 -0500 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-AC2D59D8-4119-488F-B9FA-E1DD7FF6FC72 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Does anyone know why there is no check valve on the pressurization? Cessna P= 210 and Malibu both have them. Typing and grammar errors courtesy of Siri and the iPhone. > On Oct 10, 2013, at 14:49, "pete@leapfrogventures.com" wrote: >=20 > The Lancair wiring diagram shows an interconnect switch between the landin= g 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 i= ntercoolers, once you pull the power below 20 MAP the cabin will completely d= epressurize. > =20 > Pete > =20 > From: William A. Hogarty [mailto:billhogarty@gmail.com]=20 > Sent: Wednesday, October 09, 2013 5:14 PM > To: Lancair Mailing List > Subject: Re: [LML] Removing vacuum pump? > =20 > I understood that the outflow valve was grounded whenever the gear switch w= as down. > =20 > Is this wrong? > =20 > Bill Hogarty > =20 >=20 > On Wed, Oct 9, 2013 at 9:13 AM, Craig Berland wrot= e: > I have an all-electric airplane as well and chose to not have any vacuum s= upplied to the Dukes valve. The only difference is the rate in which pressu= rization starts building in the cabin on takeoff roll. Once airborne, vacuu= m has no effect on the pressurization system. I choose to apply power a li= ttle more slowly than some pilots. This prevents any pressurization discomf= ort and typically I don't need any right brake to hold centerline. Takeoff d= istance is not an issue. If I can land there, I can easily takeoff there. I= know one pilot who has developed an electronic circuit to control a small e= lectric vacuum pump based on the landing gear position. So there are severa= l options. In my opinion, keeping the engine driven pump is the least desir= able. >=20 > Craig Berland > N7VG >=20 >=20 > Hello Dico, > You will need a vacuum port to the Dukes pressure valve for the pressuriza= tion 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 >=20 >=20 >=20 >=20 > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l > =20 --Apple-Mail-AC2D59D8-4119-488F-B9FA-E1DD7FF6FC72 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Does anyone know why there is no check= valve on the pressurization? Cessna P210 and Malibu both have them.

= Typing and grammar errors courtesy of Siri and the iPhone.

On O= ct 10, 2013, at 14:49, "pete@le= apfrogventures.com" <pet= e@leapfrogventures.com> wrote:

The Lancair wiring diagram shows an interconnect switch between t= he landing gear and the pressurization system.  IMHO, this is a complet= e waste of complexity.  Because there is no backflow va= lve on the pressure inlet from the intercoolers, once you pull the power bel= ow 20 MAP the cabin will completely depressurize.

 

Pete

&n= bsp;

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= ?

 <= /font>

I understood that the outflow valv= e was grounded whenever the gear switch was down.

 

=

Is this wrong?

<= div>

 

Bill Hogarty

=

 <= /font>

On Wed, Oct 9, 2013 at 9:13 AM, Craig B= erland <cberla= nd@systems3.net> wrote:

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

Craig Berland=
N7VG


Hello Dico,
You will need a vacuum port to the Dukes p= ressure valve for the pressurization to work correctly, I do not have any gy= ro instruments either but I needed to install an electric vacuum pump near t= he Dukes valve
Kamal T
N1104T




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