X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 19 Sep 2013 10:43:29 -0400 Message-ID: X-Original-Return-Path: <2thman1@gmail.com> Received: from mail-pb0-f45.google.com ([209.85.160.45] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6481849 for lml@lancaironline.net; Thu, 19 Sep 2013 10:19:17 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.160.45; envelope-from=2thman1@gmail.com Received: by mail-pb0-f45.google.com with SMTP id mc17so8412465pbc.18 for ; Thu, 19 Sep 2013 07:18:41 -0700 (PDT) X-Received: by 10.66.165.106 with SMTP id yx10mr2902904pab.159.1379600321719; Thu, 19 Sep 2013 07:18:41 -0700 (PDT) X-Original-Return-Path: <2thman1@gmail.com> Received: from [192.168.1.137] (c-208-53-115-208.customer.broadstripe.net. [208.53.115.208]) by mx.google.com with ESMTPSA id bb1sm9625117pbc.10.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 19 Sep 2013 07:18:40 -0700 (PDT) References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-8B52965D-DFD2-4946-8BED-31E51CA13259 X-Original-Message-Id: <82608D9D-A792-432E-91BD-31FD6D78F15B@gmail.com> Content-Transfer-Encoding: 7bit X-Mailer: iPad Mail (10B329) From: John Barrett <2thman1@gmail.com> Subject: Re: [LML] Re: IVP pressurization X-Original-Date: Thu, 19 Sep 2013 07:18:39 -0700 X-Original-To: Lancair Mailing List --Apple-Mail-8B52965D-DFD2-4946-8BED-31E51CA13259 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Yes that can work where it's a non removable part but not something I'd like= to spread on the fuel and hydraulic lines running through the tunnel. Thank you for the tip. John Sent from my iPad On Sep 19, 2013, at 6:40 AM, Ted Noel wrote: > One way you can fix a leak is:=20 >=20 > If it's physically small and you can isolate its general location... >=20 > Mix up some runny micro. Smear it over the area. Pressurize. >=20 > The pressure will force the runny micro into the hole. After it sets, rech= eck. Repeat as needed. I used this approach with vacuum in sealing some pinh= oles in my fuel bays. There I just used runny epoxy since the holes were mul= tiple, but very small individually. >=20 > Ted Noel > N540TF >=20 >=20 > On 9/19/2013 7:43 AM, John Barrett wrote: >> Many of you have supplied very useful tips in response to my questions. S= ince then I've found some substantial leaks that are probably the issue. I w= onder if others have had leaks in the tunnel under the spar box that hydraul= ic and fuel lines go through? I have a significant one here and I fear I wi= ll have to stop it in order to get adequate pressurization. Has anyone else d= ealt with this after the lines are all in and the a/c is flying? I think I c= an seal up the tunnel front and back but it will likely take a good bit of s= ome kind of goop to do it. =20 >>=20 >> Thanks for any advice. >> John Barrett >> N31VP >>=20 >> Sent from my iPad >>=20 >>=20 >> On Sep 6, 2013, at 12:40 PM, Jack Morgan wrote:= >>=20 >>> Hi John, >>>=20 >>> Attached is a pic of the wedge. I used controller rather than outflow va= lve throughout my first posting on this. Outflow valve is a better descripti= on. You interpreted my suggestions correctly. >>>=20 >>> Here is a pic of the wedge. Length from the bend is 4". The slot is 7/8= " wide and the short angle section is 1". The overall width is 4". The slot i= s 2.5" deep. The piece is scrap from something on a IV..... sorry I have for= gotten what but hopefully it is still lying around your shop. the other two b= its are what I used to set the tension holding the outflow valve closed. >>>=20 >>> I noted a suggestion that you block off the outflow valve tub from the t= op and fly the airplane. Keep in mind that the over pressure pop off valve w= ill also be disabled if you do this since if is normally in the tub. I would= double check that you can't over pressurize the cabin and damage it before t= rying that suggestion. I assume but don't actually know that the pop off val= ve protection is required if the outflow valve jams closed. >>>=20 >>> My mixing box came from Lancair with the pressure dump and temp mix leve= rs only partially tightened. One of my early discoveries was that the pressu= re dump flapper worked intermittently until I tightened the lever securely. Y= ou have either a big leak, bad outflow valve, or leaky pressure input to the= cabin if you are only getting 1/2 PSI. I was able to get 3.5 PSI before I f= ound my last significant leak. It was easily found with two shop vacs but no= t with one. >>>=20 >>> Hope this helps. >>>=20 >>> Jack >>> >>>=20 >>> On Sep 5, 2013, at 6:01 AM, Lancair Mailing List wrote: >>>=20 >>>> From: John Barrett <2thman1@gmail.com> >>>> Subject: IVP pressurization >>>> Date: September 4, 2013 7:42:10 AM EDT >>>> To: lml@lancaironline.net >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 2013.0.3408 / Virus Database: 3222/6678 - Release Date: 09/18/13= >>=20 >=20 --Apple-Mail-8B52965D-DFD2-4946-8BED-31E51CA13259 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit
Yes that can work where it's a non removable part but not something I'd like to spread on the fuel and hydraulic lines running through the tunnel.

Thank you for the tip.

John

Sent from my iPad


On Sep 19, 2013, at 6:40 AM, Ted Noel <tednoel@cfl.rr.com> wrote:

One way you can fix a leak is:

If it's physically small and you can isolate its general location...

Mix up some runny micro. Smear it over the area. Pressurize.

The pressure will force the runny micro into the hole. After it sets, recheck. Repeat as needed. I used this approach with vacuum in sealing some pinholes in my fuel bays. There I just used runny epoxy since the holes were multiple, but very small individually.

Ted Noel
N540TF


On 9/19/2013 7:43 AM, John Barrett wrote:
Many of you have supplied very useful tips in response to my questions.  Since then I've found some substantial leaks that are probably the issue.  I wonder if others have had leaks in the tunnel under the spar box that hydraulic and fuel lines go through?  I have a significant one here and I fear I will have to stop it in order to get adequate pressurization. Has anyone else dealt with this after the lines are all in and the a/c is flying?  I think I can seal up the tunnel front and back but it will likely take a good bit of some kind of goop to do it.  

Thanks for any advice.
John Barrett
N31VP

Sent from my iPad


On Sep 6, 2013, at 12:40 PM, Jack Morgan <jmorgan1023@comcast.net> wrote:

Hi John,

Attached is a pic of the wedge. I used controller rather than outflow valve throughout my first posting on this. Outflow valve is a better description. You interpreted my suggestions correctly.

Here is a pic  of the wedge. Length from the bend is 4". The slot is 7/8" wide and the short angle section is 1". The overall width is 4". The slot is 2.5" deep. The piece is scrap from something on a IV..... sorry I have forgotten what but hopefully it is still lying around your shop. the other two bits are what I used to set the tension holding the outflow valve closed.

I noted a suggestion that you block off the outflow valve tub from the top and fly the airplane. Keep in mind that the over pressure pop off valve will also be disabled if you do this since if is normally in the tub. I would double check that you can't over pressurize the cabin and damage it before trying that suggestion. I assume but don't actually know that the pop off valve protection is required if the outflow valve jams closed.

My mixing box came from Lancair with the pressure dump and temp mix levers only partially tightened. One of my early discoveries was that the pressure dump flapper worked intermittently until I tightened the lever securely. You have either a big leak, bad outflow valve, or leaky pressure input to the cabin if you are only getting 1/2 PSI. I was able to get 3.5 PSI before I found my last significant leak. It was easily found with two shop vacs but not with one.

Hope this helps.

Jack
<IV Pwedge.jpeg>

On Sep 5, 2013, at 6:01 AM, Lancair Mailing List wrote:

From: John Barrett <2thman1@gmail.com>
Subject: IVP pressurization
Date: September 4, 2013 7:42:10 AM EDT



No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3408 / Virus Database: 3222/6678 - Release Date: 09/18/13


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