X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 29 Jan 2013 07:53:31 -0500 Message-ID: X-Original-Return-Path: <2thman1@gmail.com> Received: from mail-pa0-f45.google.com ([209.85.220.45] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTPS id 6034244 for lml@lancaironline.net; Tue, 29 Jan 2013 00:28:37 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.220.45; envelope-from=2thman1@gmail.com Received: by mail-pa0-f45.google.com with SMTP id bg2so163143pad.4 for ; Mon, 28 Jan 2013 21:28:02 -0800 (PST) X-Received: by 10.68.243.33 with SMTP id wv1mr691469pbc.143.1359437282544; Mon, 28 Jan 2013 21:28:02 -0800 (PST) X-Original-Return-Path: <2thman1@gmail.com> Received: from [192.168.1.144] (c-66-235-58-245.sea.wa.customer.broadstripe.net. [66.235.58.245]) by mx.google.com with ESMTPS id p10sm8183196pax.27.2013.01.28.21.28.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 28 Jan 2013 21:28:01 -0800 (PST) References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-7C84AA92-D652-4110-9F03-323BD63518F9 X-Original-Message-Id: <09FECC8F-6B17-4B91-BA71-290F85D79882@gmail.com> Content-Transfer-Encoding: 7bit X-Mailer: iPad Mail (10A523) From: John Barrett <2thman1@gmail.com> Subject: Re: [LML] Re: hydraulic pump/reservoir in IVP X-Original-Date: Mon, 28 Jan 2013 21:27:59 -0800 X-Original-To: Lancair Mailing List --Apple-Mail-7C84AA92-D652-4110-9F03-323BD63518F9 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Leaks have always been a concern of mine with this system. One thing I did w= as to pay to have weldments inside the tank to avoid the possibility of the t= hrough bolt leaking fluid out the bottom of the tank. However a line leak do= wnstream of the hand pump during flight would seem to carry the likely risk o= f a gear up landing. Hopefully Laurie can dream up a fix. =20 A reasonable question, though, is do we know of anyone having had to land ge= ar up or partially deployed due to loss of hydraulic fluid Ina IV or IVP? John Sent from my iPad On Jan 28, 2013, at 9:11 PM, Robert R Pastusek wrote: > Laurie Fitzgerald (Australia) advises that while the manual pump can compe= nsate for an electric pump failure, it will likely only help you dump the re= maining hydraulic fluid overboard in the event of a leak. I agree with this a= ssessment=E2=80=A6for leaks within most of the IV/IV-P hydraulic system. Lau= rie further advises that he=E2=80=99s working on an improvement. If he succe= ssfully figures this out, we=E2=80=99d be pleased to publish it to LML and L= OBO followers. > =20 > Bob > =20 > =20 > From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Joh= n Barrett > Sent: Monday, January 28, 2013 10:40 AM > To: lml@lancaironline.net > Subject: [LML] Re: hydraulic pump/reservoir in IVP > =20 > Thanks Bob, > =20 > And that=E2=80=99s a great idea for the dip stick. As I recall the overfl= ow vent was called for in the plans and I have that feature. > =20 > John > =20 > From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Rob= ert R Pastusek > Sent: Monday, January 28, 2013 6:28 AM > To: lml@lancaironline.net > Subject: [LML] Re: hydraulic pump/reservoir in IVP > =20 > John Barrett wrote: > =20 > Anyone know the capacity of the reservoir? I measured the box roughly and= got 6=E2=80=9DX6=E2=80=9DX6.5=E2=80=9D. Don=E2=80=99t know the displacemen= t of the internal parts that go inside the tank. > =20 > An even more important question is how full to fill the tank? All the way= or some measurement below the top? > =20 > =20 > John, > =20 > I=E2=80=99d recommend you leave at least an inch of airspace at the top of= the reservoir; 2=E2=80=9D is better. This allows for thermal expansion and t= o accommodate any air that might get into the system. It=E2=80=99s also impo= rtant that the tank be vented as shown in the building diagrams=E2=80=A6for t= he same reason. The volume in the reservoir doesn=E2=80=99t change appreciab= ly during operation of the gear and flaps. Also note that the tank has a pic= kup for the emergency extension hand pump that is lower than the normal pump= pickup. This allows the emergency pump to draw oil for gear extension after= the electric pump has pumped all it can overboard in the event of a leak. > =20 > I made a very simple =E2=80=9Cdip stick=E2=80=9D for the reservoir by dril= ling the fill plug from the inside for a length of 1/8=E2=80=9D aluminum pip= e, and bonding the tubing in the plug with JB Weld. Then mark the dip stick f= or the max and min levels you=E2=80=99d like. Do this easily by crimping the= tube gently to mark it with a pair of side cutters. >=20 > Works well=E2=80=A6 >=20 > Bob --Apple-Mail-7C84AA92-D652-4110-9F03-323BD63518F9 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Leaks have always been a concern of mi= ne with this system.  One thing I did was to pay to have weldments insi= de the tank to avoid the possibility of the through bolt leaking fluid out t= he bottom of the tank. However a line leak downstream of the hand pump durin= g flight would seem to carry the likely risk of a gear up landing. &nbs= p;Hopefully Laurie can dream up a fix.  

A rea= sonable question, though, is do we know of anyone having had to land gear up= or partially deployed due to loss of hydraulic fluid Ina IV or IVP?

John

Sent from my iPad

<= div>
On Jan 28, 2013, at 9:11 PM, Robert R Pastusek <rpastusek@htii.com> wrote:

=

Laurie Fitzgerald (Australia) advises that while the manual pump c= an compensate for an electric pump failure, it will likely only help you dump the remaining hydraulic fluid overboard i= n the event of a leak. I agree with this assessment=E2=80=A6for leaks within= most of the IV/IV-P hydraulic system. Laurie further advises that he=E2=80=99= s working on an improvement. If he successfully figures this out, we=E2=80=99d be pleased to publish it to LML and LOBO fol= lowers.

 

Bob

 

 

From: Lancair Mailing List [mailto:lml@lancairon= line.net] On Behalf Of John Barrett
Sent: Monday, January 28, 2013 10:40 AM
To: lml@lancaironline.net
Subject: [LML] Re: hydraulic pump/reservoir in IVP<= /p>

 

Thanks Bob,<= /span>

 

And that=E2=80=99s a gr= eat idea for the dip stick.  As I recall the overflow vent was called f= or in the plans and I have that feature.

 

John<= /p>

 

 

John Barrett wrote:

 

Anyone know the capacity of the reservoir?  I me= asured the box roughly and got 6=E2=80=9DX6=E2=80=9DX6.5=E2=80=9D.  Don= =E2=80=99t know the displacement of the internal parts that go inside the ta= nk.

 

An even more important question is how full to fill t= he tank?  All the way or some measurement below the top?

=

 

 

John,=

 

I=E2=80=99d recommend y= ou leave at least an inch of airspace at the top of the reservoir; 2=E2=80=9D= is better. This allows for thermal expansion and to accommodate any air tha= t might get into the system. It=E2=80=99s also important that the tank be vented as shown in the building diagrams=E2=80=A6for the s= ame reason. The volume in the reservoir doesn=E2=80=99t change appreciably d= uring operation of the gear and flaps. Also note that the tank has a pickup f= or the emergency extension hand pump that is lower than the normal pump pickup. This allows the emergency pump to draw o= il for gear extension after the electric pump has pumped all it can overboar= d in the event of a leak.

 

I made a very simple =E2= =80=9Cdip stick=E2=80=9D for the reservoir by drilling the fill plug from th= e inside for a length of 1/8=E2=80=9D aluminum pipe, and bonding the tubing i= n the plug with JB Weld. Then mark the dip stick for the max and min levels you=E2=80=99d like. Do this easily by crimping the tube g= ently to mark it with a pair of side cutters.


Works well=E2=80=A6


Bob

= --Apple-Mail-7C84AA92-D652-4110-9F03-323BD63518F9--