by InfoAve.Net (PMDF V5.1-5 #17060) with SMTP id <01IGDRKCAN3W96YT76@InfoAve.Net> for cozy_builders@hpwarhw.an.hp.com; Tue, 11 Mar 1997 16:04:25 EST Date: Tue, 11 Mar 1997 16:04:24 -0500 (EST) Date-Warning: Date header was inserted by InfoAve.Net From: Nick Ugolini Subject: COZY: Vac Lines Question for you AP's I am plumbing up my vacuum system and have the following question: I am using hard tubing between the vac pump and the vac regulator. -Do I need hard tubing between the regulator and the insturments? Or can I use flexible tubing such as Tygon tubing? Thanks Nick Ugolini unick@mail.charleston.net Varieze N89RS LongEZ N29TM Cozy Mark IV #0264 by SERV05.SLAC.STANFORD.EDU (PMDF V5.1-8 #16063) with SMTP id <01IGDRHKUG4G004LCZ@SERV05.SLAC.STANFORD.EDU> for cozy_builders@hpwarhw.an.hp.com; Tue, 11 Mar 1997 16:02:11 PST Date: Tue, 11 Mar 1997 16:03:59 -0800 From: hrogers@SLAC.Stanford.EDU (Howard Rogers) Subject: Re: COZY: Vac Lines >Question for you AP's > >I am plumbing up my vacuum system and have the following question: > >I am using hard tubing between the vac pump and the vac regulator. > >-Do I need hard tubing between the regulator and the insturments? Or can I >use flexible tubing such as Tygon tubing? > >Thanks > > >Nick Ugolini >unick@mail.charleston.net > >Varieze N89RS >LongEZ N29TM >Cozy Mark IV #0264 Nick, as an A&P and something of a vacuum specialist at work, I think I can answer your question. Tygon isn't the best choice for vacuum, simply because it isn't all that resistant to collapse. There is some standard aircraft grade tubing, but it's bulky, and I believe there is an even better way. Polyflow (polyethelyne) tubing is very light weight, quite flexible, extremely easy to work with, and the fittings are cheap and easy to install. No hose clamps will be required, and it will be very easy and convenient to disconnect and reconnect vacuum lines in the future. The stuff will withstand well over 100 psi positive, and is nice and leak-tight under vacuum. Behind the instrument panel, it is almost as easy to work with as cabling. Try it. You'll like it! Howard Rogers, A&P 2005148 Date: Wed, 12 Mar 1997 01:44:56 -0500 (EST) From: Westlande@aol.com Subject: Re: COZY: Vac Lines In a message dated 3/11/97 8:28:02 PM, hrogers@SLAC.Stanford.EDU (Howard Rogers) wrote: >Polyflow (polyethelyne) tubing is very light weight, quite >flexible, extremely easy to work with, and the fittings are cheap and easy >to install. Thanks Howard. Does anyone have a mail order source for the tube and fittings? -eric Date: Tue, 11 Mar 1997 23:05:50 -0800 From: berkut@loop.com Subject: Re: COZY: Vac Lines >Polyflow (polyethelyne) tubing is very light weight, quite >flexible, extremely easy to work with, and the fittings are cheap and easy >to install. No hose clamps will be required, and it will be very easy and >convenient to disconnect and reconnect vacuum lines in the future. The >stuff will withstand well over 100 psi positive, and is nice and leak-tight >under vacuum. Behind the instrument panel, it is almost as easy to work >with as cabling. Try it. You'll like it! > >Howard Rogers, A&P 2005148 > I've used Polyflow for pitot and static and loved it there, hadn't thought of it for vacuum. Great idea. What diameter, both for the long run from engine to nose, and from the regulator to the instruments? -- Czech Sikhs! Richard Riley "Heavier than air flying machines are impossible." Lord Kelvin, President, Royal Society, c 1895 See the Berkut at http://www.berkut.com by SERV05.SLAC.STANFORD.EDU (PMDF V5.1-8 #16063) with SMTP id <01IGEOVUT5KK004HXW@SERV05.SLAC.STANFORD.EDU> for cozy_builders@hpwarhw.an.hp.com; Wed, 12 Mar 1997 07:58:12 PST Date: Wed, 12 Mar 1997 08:00:03 -0800 From: hrogers@SLAC.Stanford.EDU (Howard Rogers) Subject: Re: COZY: Vac Lines > Thanks Howard. > >Does anyone have a mail order source for the tube and fittings? > >-eric Eric, We use a lot of the stuff around here at work. I will check with our buyers and try to find out a good source for this stuff. It may be that they get it from a large wholesaler that might not be happy dealing with small orders from individuals. A good place to try looking for it would be in the Yellow Pages under Pneumatics, as it is frequently used in that area. --Howard Rogers, 415-926-4052 hrogers@slac.stanford.edu Date: Wed, 12 Mar 1997 11:49:36 -0800 From: Wayne Lanza <"wlanza@iu.net@wlanza"@iu.net> Subject: COZY: vac parts sources Wayne Lanza wrote: > > >Howard Rogers wrote: > > > >Polyflow (polyethelyne) tubing is very light weight, quite > >flexible, extremely easy to work with, and the fittings are cheap and > >easy to install. > > > > Thanks Howard. > > > > Does anyone have a mail order source for the tube and fittings? > I've seen about a dozen planes (flying examples) that used basically the same type of tubing as polyflow. It is a semi-rigid milky white poly tubing that works great with low vacuum systems. It is commonly used for ice maker, dishwasher, etc.. type water hook-ups. I found the tubing (various sizes) and all kinds of barbed & compression fittings at the local plumbing supply along with the plastic NP pipe fittings that thread into the backs of my gyros. In addition I ran my static sytem using the same material. It is easy to work with, cuts with a knife and cost me about $5 for everything. Happy Plumbing, Wayne Lanza