X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 14 Mar 2013 17:11:38 -0400 Message-ID: X-Original-Return-Path: Received: from mail-ie0-f173.google.com ([209.85.223.173] verified) by logan.com (CommuniGate Pro SMTP 6.0.2) with ESMTPS id 6121536 for lml@lancaironline.net; Thu, 14 Mar 2013 16:16:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.223.173; envelope-from=toddlong1@gmail.com Received: by mail-ie0-f173.google.com with SMTP id 9so3549354iec.32 for ; Thu, 14 Mar 2013 13:16:18 -0700 (PDT) X-Received: by 10.50.207.39 with SMTP id lt7mr3529752igc.110.1363292178043; Thu, 14 Mar 2013 13:16:18 -0700 (PDT) X-Original-Return-Path: Received: from [10.226.8.252] (72.sub-174-238-97.myvzw.com. [174.238.97.72]) by mx.google.com with ESMTPS id hi4sm4701481igc.6.2013.03.14.13.16.15 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 14 Mar 2013 13:16:17 -0700 (PDT) Subject: Re: [LML] Re: Pressurization References: From: Todd Long Content-Type: multipart/alternative; boundary=Apple-Mail-3A9C4A9E-4574-454B-847C-5DDF562F2EA5 X-Mailer: iPhone Mail (10B146) In-Reply-To: X-Original-Message-Id: <778AA398-01DB-41B4-9395-BCA119029D93@gmail.com> X-Original-Date: Thu, 14 Mar 2013 15:17:42 -0500 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-3A9C4A9E-4574-454B-847C-5DDF562F2EA5 Content-Type: text/plain; charset=windows-1251 Content-Transfer-Encoding: quoted-printable The pump seems way too simple. Any other ideas of something that will take m= e 2 or 3 days to install and use all kinds of fancy rare hard to find fittin= gs?=20 Going to order the pump tomorrow.=20 Typing and grammar errors courtesy of Siri and the iPhone. On Mar 14, 2013, at 15:05, "pete@leapfrogventures.com" wrote: > Setting a switch to depressurize when on the deck is not needed, as there i= s no way the engine will generate enough pressure when idling around to even= remotely pressurize the cabin. You will lose all of your pressure when you= pull back your power on the approach. There is no check valve in our mixe= r boxes, so any residual pressure will get sucked into the engine due to the= low manifold pressure of approach/landing/taxi. > =20 > Here is the $15 pump I use to pull a vacuum on the Dukes during takeoff: h= ttps://solarbotics.com/product/45050/ > =20 > I have a VP200, so I just set it so that the pump is on during takeoff mod= e, and turns off 2 minutes later when the system switches to cruise mode. I= t completely eliminates the takeoff pop.=20 > =20 > Unless I am flying really high, I set the Dukes to 2500 feet above my dest= ination elevation. This way, when I power off on the approach, the cabin pr= essure will already be equalized for my altitude. A properly calibrated Duk= es will set the cabin altitude to about 700 feet above what you set the dest= ination altitude. > =20 > I just use standard automotive vacuum hose to connect the pump to the duke= s. It doesn=92t need much vacuum to open the bellows (you can suck them ope= n with your mouth if you try), so any semi rigid hose will work fine. > =20 > Pete > =20 > From: vtailjeff@aol.com [mailto:vtailjeff@aol.com]=20 > Sent: Thursday, March 14, 2013 6:31 AM > To: Lancair Mailing List > Subject: Re: [LML] Re: Pressurization > =20 > The system should be set so that the aircraft is unpressurized on deck-- u= sually through a gear down (ivp) or weight on wheels switch (Evo). This is t= o protect the pressure vessel. > =20 > Jeff >=20 > Sent from my iPad >=20 > On Mar 14, 2013, at 6:26 AM, Ronald STEVENS wrote: >=20 > Yes this I do not understand, my AC and pressurization is on after I start= the plane and stops when I stop the engine, and my cabin is cool and fine l= ike this. >=20 > Ronald Stevens > 786-338 1678 > =20 >=20 > On Mar 14, 2013, at 7:58 AM, David Weinsweig wrote:= >=20 > I don't pressurize until I get up to 6-8,000 ft. This keeps my cabin a bit= cooler and comfortable at low altitude and doesn't steal power when it's ne= eded most ie on takeoff and early climb out. Do others do it differently? > =20 > David Weinsweig > N750DW Propjet >=20 > From: > Todd Long > Sender: > > Subject: > Re: [LML] Re: vacuum hose > Date: > Wed, 13 Mar 2013 17:09:25 -0400 > To: > lml@lancaironline.net > >=20 > > On take off the other day I was up to 2 Psid by the time I went wheels up.= That was with the gold box 95% closed. Does anyone happen to have a dukes m= anual? >=20 > Typing and grammar errors courtesy of Siri and the iPhone. >=20 > On Mar 13, 2013, at 14:14, Colyn Case wrote: >=20 > > If you have a vacuum system, you can hook that up. > > If you don't, you can buy a small pump and hook that up. I haven't don= e the latter but I've heard the door seal pump works okay for this applicati= on. > >=20 > > Using that main vac pump almost completely eliminates the cabin pressure= increase at takeoff. > >=20 > > On Mar 13, 2013, at 1:21 PM, Todd Long wrote: > >=20 > > How do most of you operate the pressurization system to avoid the major b= umps at takeoff? My vacuum line was capped.=20 > >=20 > > Typing and grammar errors courtesy of Siri and the iPhone. > >=20 > > On Mar 13, 2013, at 10:56, Paul Miller wrote: > >=20 > >> Autozone, lots of smaller sizes for vacuum hose by the foot. > >> On 2013-03-13, at 10:51 AM, Colyn Case wrote:= > >>=20 > >>> I'm looking for a minimum thickness vacuum hose just to hold the dukes= pressurization valve open on takeoff. Right now I have a 1/4" i.d. .64" o.= d. big fat rubber line. I don't see anything on McMaster Carr that is thi= nner wall. But given it probably needs to handle maybe 10 psi of vacuum, th= e big fat rubber hoses seem like overkill. > >>=20 > >>=20 > >> -- > >> For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.= html > >=20 > > -- > > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.h= tml > >=20 > >=20 > > -- > > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.h= tml >=20 > Sent from my iPad --Apple-Mail-3A9C4A9E-4574-454B-847C-5DDF562F2EA5 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
The pump seems way too simple. Any oth= er ideas of something that will take me 2 or 3 days to install and use all k= inds of fancy rare hard to find fittings? 
Going to order the= pump tomorrow. 

Typing and grammar errors courtesy of Si= ri and the iPhone.

On Mar 14, 2013, at 15:05, "pete@leapfrogventures.com" <pete@leapfrogventures.com> wrote:

Setting a switch to depressurize when on t= he deck is not needed, as there is no way the engine will generate enough pr= essure when idling around to even remotely pressurize the cabin.  You w= ill lose all of your pressure when you pull back your power on the approach.=    There is no check valve in our mixer boxes, so any residual pre= ssure will get sucked into the engine due to the low manifold pressure of ap= proach/landing/taxi.

 

Here is the $15 pump I use to pull a vacuum on the Dukes dur= ing takeoff:  https://solarbotics.com/product/45050/

 

I have a VP200,= so I just set it so that the pump is on during takeoff mode, and turns off 2= minutes later when the system switches to cruise mode.  It completely e= liminates the takeoff pop. 

 

Unless I am flying really high, I set the Dukes to 2500 feet above my desti= nation elevation.  This way, when I power off on the approach, the cabi= n pressure will already be equalized for my altitude.  A properly calib= rated Dukes will set the cabin altitude to about 700 feet above what you set= the destination altitude.

 

I just= use standard automotive vacuum hose to connect the pump to the dukes. = It doesn=E2=80=99t need much vacuum to open the bellows (you can suck them o= pen with your mouth if you try), so any semi rigid hose will work fine.

 

Pete

 

From: vtailjeff@aol.com [mailto:vtailjeff@aol.com]
Sent: Thursday, March 14= , 2013 6:31 AM
To: Lancair Mailing List
Subject: Re: [LM= L] Re: Pressurization

 

The system should be set s= o that the aircraft is unpressurized on deck-- usually through a gear down (= ivp) or weight on wheels switch (Evo). This is to protect the pressure vesse= l.

 

Jeff

Sent from my iPad


On Mar 14= , 2013, at 6:26 AM, Ronald STEVENS <Ron= ald@sdc.com> wrote:

Yes this I do= not understand, my AC and pressurization is on after I start the plane and s= tops when I stop the engine, and my cabin is cool and fine like this.
Ronald Stevens

786-338 1678<= /o:p>

 

=


On Mar 14, 20= 13, at 7:58 AM, David Weinsweig <= weinsweigd@gmail.com> wrote:

I do= n't pressurize until I get up to 6-8,000 ft. This keeps my cabin a bit coole= r and comfortable at low altitude and doesn't steal power when it's needed m= ost ie on takeoff and early climb out. Do others do it differently?

 

David Weinsweig

N750DW Propjet

=

<marv@la= ncaironline.net>

=

From:

Todd Long <toddlong1@gmail.com>

<= /td>

Sender:

Subject:

Re: [L= ML] Re: vacuum hose

Date:

Wed, 13 Mar 20= 13 17:09:25 -0400

To:

lml@lancaironline.net

<= b><image001.gif>

<image002.gif>

On take off the oth= er day I was up to 2 Psid by the time I went wheels up. That was with the go= ld box 95% closed. Does anyone happen to have a dukes manual?

Typing and grammar errors courtesy of Siri and the iPhon= e.

On Mar 13, 2013, at 14:14, Colyn Case <colyncase@earthlink.net> wrote:

> If you have a vacuum system, you can hook that up.
> If you don't, you can buy a small pump and hook that up. &nb= sp; I haven't done the latter but I've heard the door seal pump works okay f= or this application.
> 
> Using t= hat main vac pump almost completely eliminates the cabin pressure increase a= t takeoff.
> 
> On Mar 13, 2013, a= t 1:21 PM, Todd Long wrote:
> 
> H= ow do most of you operate the pressurization system to avoid the major bumps= at takeoff? My vacuum line was capped. 
> 
> Typing and grammar errors courtesy of Siri and the iPhone.=
> 
> On Mar 13, 2013, at 10:56, P= aul Miller <pjdmiller@gmail.com> wrote:
> 
>> Autozone, l= ots of smaller sizes for vacuum hose by the foot.
>> O= n 2013-03-13, at 10:51 AM, Colyn Case <colyncase@earthlink.net> wrote:
>>&nbs= p;
>>> I'm looking for a minimum thickness vacuum h= ose just to hold the dukes pressurization valve open on takeoff.  Right= now I have a 1/4" i.d. .64" o.d. big fat rubber line.    I don't s= ee anything on McMaster Carr that is thinner wall.  But given it probab= ly needs to handle maybe 10 psi of vacuum, the big fat rubber hoses seem lik= e overkill.
>> 
>> 
>> --
>> For archives and unsub&nb= sp;http://mail.lancaironline.n= et:81/lists/lml/List.html
> 
> --
> For archives and unsub <= span style=3D"text-decoration:none">http://mail.lancaironline.net:81/lists/l= ml/List.html
> 
>&= nbsp;
> --
> For archives and unsub&nb= sp;http://mail.lancaironline.n= et:81/lists/lml/List.html

Sent from= my iPad

= --Apple-Mail-3A9C4A9E-4574-454B-847C-5DDF562F2EA5--