X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-ma05.mx.aol.com ([64.12.100.31] verified) by logan.com (CommuniGate Pro SMTP 6.0.2) with ESMTP id 6121791 for lml@lancaironline.net; Thu, 14 Mar 2013 19:59:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.100.31; envelope-from=vtailjeff@aol.com Received: from mtaout-ma05.r1000.mx.aol.com (mtaout-ma05.r1000.mx.aol.com [172.29.41.5]) by imr-ma05.mx.aol.com (Outbound Mail Relay) with ESMTP id 0C9AF1C000066 for ; Thu, 14 Mar 2013 19:59:13 -0400 (EDT) Received: from [10.189.125.23] (mobile-166-147-096-094.mycingular.net [166.147.96.94]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mtaout-ma05.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPSA id 61197E0000C0; Thu, 14 Mar 2013 19:59:05 -0400 (EDT) References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-4CC81219-3295-41A6-9F9D-DC5E954F2524 Message-Id: <9B0958CC-8229-4281-9CF8-D6EA75C59812@aol.com> Content-Transfer-Encoding: 7bit X-Mailer: iPad Mail (9B206) From: vtailjeff@aol.com Subject: Re: [LML] Re: Pressurization Date: Thu, 14 Mar 2013 18:59:00 -0500 To: Lancair Mailing List x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1363305552; bh=F5yvLnOTUkXi0a+eRFPaDp7NPFkfzkxdxVkm2eaGLjQ=; h=From:To:Subject:Message-Id:Date:Mime-Version:Content-Type; b=rmyA00V68GGICt8ZrZFGxTiYEeCxIBoN6NrfZsgUVd3Mjkf1iok6N+yHhcNNBf+Tz p1c9U2QW2H5MI58zQGRh/bb6/2JlV3plEL6xqR5eg6tXRRaDFsih1B9VshDXbMiJwu TZN+FDVb9dVN/R+UyD0Bp7cZmUAUclNsXDSuxu3E= X-AOL-SCOLL-SCORE: 1:2:438571232:93952408 X-AOL-SCOLL-URL_COUNT: 2 x-aol-sid: 3039ac1d2905514264483bf0 X-AOL-IP: 166.147.96.94 --Apple-Mail-4CC81219-3295-41A6-9F9D-DC5E954F2524 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Pete, no disrespect but what about a go around, touch and go, etc.? Do you h= ave to reset the switch? It sounds like from your description you have to ma= nually set the system for every takeoff event. Jeff Sent from my iPad On Mar 14, 2013, at 3:05 PM, "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=E2=80=99t need much vacuum to open the bellows (you can suck th= em open 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-4CC81219-3295-41A6-9F9D-DC5E954F2524 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Pete, no disrespect but wh= at about a go around, touch and go, etc.? Do you have to reset the switch? I= t sounds like from your description you have to manually set the system for e= very takeoff event.

Jeff

Sent from my iPad

On Mar 14, 2013, at 3:05 PM, "pete@leapfrogventures.com" <pete@leapfrogventures.com> wrote:

<= /div>

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] <= br>Sent: Thursday, March 14, 2013 6:31 AM
To: Lancair Maili= ng List
Subject: Re: [LML] Re: Pressurization

 

The system should be set so that the aircraft is unpressurized on d= eck-- usually through a gear down (ivp) or weight on wheels switch (Evo). Th= is is to protect the pressure vessel.

 

Jeff
Sent from my iPad


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

=
<= p class=3D"MsoNormal">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 cabi= n is cool and fine like this.

Ronald Stevens

786-338 1678

 


On Mar 14, 2013, at 7:58 AM, David Weinsweig <weinsweigd@gmail.com> wrote:=

<= div>

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 do= esn't steal power when it's needed most ie on takeoff and early climb out. D= o others do it differently?

=  

David Weinsweig<= /o:p>

N7= 50DW Propjet

From:

Todd Long <toddlong1@gmail= .com>

Se= nder:

<marv@lancaironline.net>=

Subject:

Re: [LML] Re: vacuum hose

=

Date:

Wed, 13 Mar 2013 17:09:25 -0400

To:

lml@lancaironline.net=

<im= age001.gif>

<image002.gif>

On take off the other day I was up to 2 Psid by the time I went w= heels up. That was with the gold box 95% closed. Does anyone happen to have a= dukes manual?

Typing and grammar errors c= ourtesy of Siri and the iPhone.

On Mar 13, 2013, at 14:1= 4, Colyn Case <colyncase@earth= link.net> wrote:

> If you have a vacuum system= , you can hook that up.
> If you don't, you can buy a sma= ll pump and hook that up.   I haven't done the latter but I've heard th= e door seal pump works okay for this application.
> =
> Using that main vac pump almost completely eliminates t= he cabin pressure increase at takeoff.
> 
> On Mar 13, 2013, at 1:21 PM, Todd Long wrote:
= >= ; 
> How do most of you operate the pressurization s= ystem to avoid the major bumps at takeoff? My vacuum line was capped. <= /span>
> 
> Typing and grammar errors co= urtesy of Siri and the iPhone.
> 
&g= t; On Mar 13, 2013, at 10:56, Paul Miller <pjdmiller@gmail.com> wrote:
> =
>> Autozone, lots of smaller sizes for vacuum hose by the fo= ot.
>> On 2013-03-13, at 10:51 AM, Colyn Case <colyncase@earthlink.net> wrote= :
>> 
>>> I'm looking fo= r a minimum thickness vacuum hose just to hold the dukes pressurization valv= e open on takeoff.  Right now I have a 1/4" i.d. .64" o.d. big fat rubb= er line.    I don't see anything on McMaster Carr that is thinner w= all.  But given it probably needs to handle maybe 10 psi of vacuum, the= big fat rubber hoses seem like overkill.
>> 
>> 
>> --
<= span style=3D"font-family:"Helvetica","sans-serif"">>= > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html
> 
> --
> For arch= ives and unsub http://ma= il.lancaironline.net:81/lists/lml/List.html
&= gt; 
> 
> --
= > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html

Sent from my iPad

= --Apple-Mail-4CC81219-3295-41A6-9F9D-DC5E954F2524--