REFLECTOR: Vacuum Pump

Wed Nov 26 12:46:35 CST 2008

Chuck,

I'd like to share my opinions and experience on the gyro issue.  The gyros that are in my panel sat for 9 years and have been working fine for three years.  The rest of this is opinion, so be forewarned.  I think that a manufacturer that makes the 6 mo disclaimer has in fact found a neat way of getting out honoring their warrantee.  Secondly, I'd like to see how anyone could, if they wanted to, design a bearing that would self destruct during lack of use.  A shaft sitting in a bearing subject to gravity would logically force out the oil and make metal to metal contact.  What isn't logical is that it would take 6 mo.  As soon as the shaft began to move it would wipe oil into the dry spot.  If this was a real problem, which I doubt, you could solve it by inverting the gyro every month and put it back on the shelf.

Larry Coen
N136LC

From: Chuck Jensen 
Sent: Wednesday, November 26, 2008 6:12 AM
To: Velocity Aircraft Owners and Builders list 
Subject: Re: REFLECTOR: Vacuum Pump

Several of the mechanical gyro instrument manufacturers will only warrant a 6 month shelf life because bearing/lubrication issues if it sets unused for long period of time and it takes an overhaul to put them back to good condition.  Consistent with the observation that the gyros in a derelict plane often don't work, or work for long, when they are spun up after a couple years setting dead.

Chuck Jensen 
  -----Original Message-----
  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On Behalf Of John Overman
  Sent: Tuesday, November 25, 2008 1:46 PM
  To: Velocity Aircraft Owners and Builders list
  Subject: Re: REFLECTOR: Vacuum Pump

        Another factor could be that gyro instruments, even brand new ones tend to go bad if left on the shelf and not used. If you have had yours for several years, they may need an overhaul before they will work.

        --- On Tue, 11/25/08, Velocity <velocityxl at fastmail.fm> wrote:

          From: Velocity <velocityxl at fastmail.fm>
          Subject: Re: REFLECTOR: Vacuum Pump
          To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
          Date: Tuesday, November 25, 2008, 7:45 AM

Looking more and more like I might have to get A Dynon.  I bought my 6 ix pack years ago and just like the look of it. And the price was right. TILL NOWRon----- Original Message ----- From: "Alex Balic"
 <velocity_pilot at verizon.net>To: "'Velocity Aircraft Owners and Builders list'"<reflector at tvbf.org>Sent: Tuesday, November 25, 2008 8:23 AMSubject: Re: REFLECTOR: Vacuum Pump> They have the electric one right side bottom also- but for $1800 you can> just about buy a Dynon ->> -----Original Message-----> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On> Behalf Of Scott Derrick> Sent: Monday, November 24, 2008 6:44 PM> To: Velocity Aircraft Owners and Builders list> Subject: Re: REFLECTOR: Vacuum Pump>> here's what I was talking about.  Left side, bottom.>> www.aircraftspruce.com/pdf/2009Individual/Cat09385.pdf>> Scott Derrick wrote:>> They have those horn looking things that make vacuum when your moving?>>>> I've seen them on old Bonanza's and
 Mooneys.>>>> Scott>>>> Velocity wrote:>>> Has any one come up with a electric vacuum pump>>> to run there Vacuum gauges?>>>>>> I have looked at a few electric smog pumps  but they  just do notdraw>>> enough vacuum.>>>>>>>>> Before you tell me to go all electric I have heard that already .If I>>> had the money I would do all sorts>>> of things but I do not so I am trying to keep it Cheap.>>>>>> I already have the Gauges just need a way to run them.>>>>>> Oh by the way this is an LT1 engine install. So the>>> engine driven vacuum pump is a little more complicated>>> to get installed.>>>>>>
 Ron>>>>>>>>>>>>>>>------------------------------------------------------------------------>>>>>> _______________________________________________>>> To change your email address, visit> http://www.tvbf.org/mailman/listinfo/reflector>>>>>> Visit the gallery!  www.tvbf.org/gallery>>> user:pw = tvbf:jamaicangoose>>> Check new archives: www.tvbf.org/pipermail>>> Check old archives:http://www.tvbf.org/archives/velocity/maillist.html>> _______________________________________________>> To change your email address, visit> http://www.tvbf.org/mailman/listinfo/reflector>>>> Visit the gallery!  www.tvbf.org/gallery>> user:pw = tvbf:jamaicangoose>> Check new archives: www.tvbf.org/pipermail>> Check old
 archives:http://www.tvbf.org/archives/velocity/maillist.html>>> _______________________________________________> To change your email address, visit> http://www.tvbf.org/mailman/listinfo/reflector>> Visit the gallery!  www.tvbf.org/gallery> user:pw = tvbf:jamaicangoose> Check new archives: www.tvbf.org/pipermail> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html>>> _______________________________________________> To change your email address, visit > http://www.tvbf.org/mailman/listinfo/reflector>> Visit the gallery!  www.tvbf.org/gallery> user:pw = tvbf:jamaicangoose> Check new archives: www.tvbf.org/pipermail> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html> _______________________________________________To change your email address,
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