Sender: <marv@lancaironline.net>
To: lml@lancaironline.net
Date: Mon, 05 Nov 2007 10:55:23 -0500
Message-ID: <redirect-2456497@logan.com>
Received-SPF: pass
 receiver=logan.com; client-ip=209.225.8.182; envelope-from=troneill@charter.net
From: "terrence o'neill" <troneill@charter.net>
References: <list-2456257@logan.com>
Subject: Re: [LML] hydraulic mousetraps for the landing gear
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="windows-1250";
	reply-type=original
Content-Transfer-Encoding: 7bit

Russell,

With this system, where fluid goes to and fro, your experience would 
indicate we need a filter at each port of each cylinder. .. like, adding 18 
little fiolters  into the lines,-- after finding room.  Frankly, at first 
blush this sounds like a good idea to me... and I wondered if there wasn't 
something missing from the building manual of the project I bought with the 
plumbing already done (but not tested). I just tested and adjusted the gear 
retraction for the first time last month ... and am concerned by all the 
recent lml comments on leaks and other problems with the system. In addition 
to blowing out the lines with air, should one flush them with -- 'proper 
thin oils' -- what oils? Since I've already 'powered up' the system, will I 
now have to pull all the cylinders and replace the O-rings and seals?
I hope others experienced in hydraulics design will offer some comments or 
suggestions on adding filtration to each cylinder. I don't want to spend a 
lot of time rebuilding cylinders when I finally get flying. This would be 
such a big job I'd consider yanking all the hydraulics out and converting to 
three actuators, with electric clutches for free fall.

Terrence
L235/320 N211AL


----- Original Message ----- 
From: "Russell" <N2AA@bellsouth.net>
To: <lml@lancaironline.net>
Sent: Monday, November 05, 2007 08:09 AM
Subject: [LML] hydraulic mousetraps for the landing gear


> Well guys and gals, I have not dealt with my hydraulic system yet.  I hope
> to install the landing gear and hydraulic system in December.
> On the other hand, I have considerable experience with hydraulic systems 
> as
> that was my training in the Navy.
> A couple issues that I have not heard is water in the oil and filtration.
> When constructing a hydraulic system is in utmost importance to ensure 
> that
> all lines and components are clean of debris.  One of the best ways to do
> this is the flush the system before the cylinders with proper thin oils.
> This helps remove debris and moisture.  In studying the hydraulic system I
> have Not noticed proper filtration.  Without proper filtration any 
> particles
> left in the system will lead to seal failures.
> I plan to install some kind filtration system to ensure that my oil stays
> clean. Lastly the hydraulic oils should be changed at least one to two 
> years
> depending on the humidity conditions.  Surprising hydraulic oils do trap
> moisture which also leads to O-ring failure.
> Well that's my two cents.
> Happy flying
> Russell
> Asheville North Carolina
> Kit number 251
>
>
>
> -----Original Message-----
> From: Lancair Mailing List [mailto:lml@lancaironline.net]
> Sent: Monday, November 05, 2007 6:01 AM
> Subject: lml Digest #2158
>
>        Lancair Mailing List Digest #2158
>
> 1) Re: Speeds at Altitude
>    by billhogarty <billhogarty@hughes.net>
> 2) Re: Oil lines
>    by billhogarty <billhogarty@hughes.net>
> 3) Design for Circuit Breakers & Fuses?
>    by "Valin & Allyson Thorn" <thorn@starflight.aero>
> 4) Re: Filling and Sanding
>    by "Bryan Wullner" <sbej@verizon.net>
> 5) Re: FW: [LML] LNC2 Hyd Chirp Alternative Mousetrap
>    by "genemartin" <genemartin@enid.com>
> 6) Re: Speeds at Altitude
>    by VTAILJEFF@aol.com
> 7) MR-16 Bulbs revisited
>    by "Marshall Michaelian" <mmichaelian@comcast.net>
> 8) Re: Taxi and Landing lights on a 320
>    by marv@lancair.net
>
> This digest is sent to you because you are subscribed to
>  the mailing list <lml@lancaironline.net>.
> For archives and help click http://lancaironline.net/Lists/lml/
> LML website: http://www.lancaironline.net/maillist.html
>
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.503 / Virus Database: 269.15.19/1105 - Release Date: 
> 11/2/2007
> 11:04 AM
>
>
>
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.503 / Virus Database: 269.15.19/1105 - Release Date: 
> 11/2/2007
> 11:04 AM
>
>
>
> --
> For archives and unsub 
> http://mail.lancaironline.net:81/lists/lml/List.html
>