---------------------------------------------------------- RV10-List Digest Archive --- Total Messages Posted Fri 02/10/12: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:42 AM - Re: Re: Pitot tube mast (Gordon Anderson) 2. 07:49 AM - Leaking brake cylinder fitting (Les Kearney) 3. 10:37 AM - Re: Re: Pitot tube mast (Nikolaos Napoli) 4. 11:11 AM - Re: Re: Pitot tube mast (Tim Olson) 5. 12:53 PM - Re: Re: Pitot tube mast (Rob Kochman) ________________________________ Message 1 _____________________________________ Time: 04:42:58 AM PST US From: Gordon Anderson Subject: Re: RV10-List: Re: Pitot tube mast Hi Kelly, I just finished installing the Gretz mount for the Dynon pitot. The Gretz kit appears to be slightly more complicated, having a reinforcing backplate riveted to the skin and spar, plus a spacer plate and most of the nutplates and bolts required (except those to join the pitot and mast). The arrangement is obviously heavier (steel mast, more parts) but perhaps more robust (no cracking history). The mast is removable for storage and painting if wanted (eg. with the chrome mast) and is not in place when you rivet the bottom skins on. The mast is bolted afterwards to the reinforcement plate inside the wing. In consultation with my tech advisor I also added an additional length of J-stiffener along the back edge of the reinforcing plate to reduce skin flexing under load. Altogether it became a little complex (perhaps over engineered) but it shouldn't fall off=85. :-) Cheers, Gordon 41015 Switzerland ________________________________ Message 2 _____________________________________ Time: 07:49:31 AM PST US From: "Les Kearney" Subject: RV10-List: Leaking brake cylinder fitting Hi I installed by brakes per Van's plan eons ago. My only problem was a weeping leak at the bottom on one master cylinder that I couldn't fix. What I was experiencing was a zero pressure leak, just a weeping leak that would form a drop of fluid after a few days. Then I would get a drip on the floor pan. To solve, I tried changing the fittings and then, at the suggestion of Matco, I used Loctite 567 thread sealant. Still no luck. My fear was I had over tightened the compression fitting and damaged the threads. Anyway, I pulled the cylinder and installed a new one. I sent the original back to Matco for inspection. I just had a very interesting call from Matco where they explained what happened. First, they did a zero pressure test and duplicated my problem. Them they cleaned the treads and tried again. They still had a problem. Finally they disassembled the cylinder and really cleaned it with acetone. WARNING: don't use solvent if the rubber fittings are in place as they will be damaged. They found hardened sealant at the bottom of the fitting hole that was preventing the Loctite 567 from doing its job. They said there is a leak path at the bottom of compression fittings that the Loctite seals. The old hardened sealant was preventing this from happening. When completely cleaned and reinstalled using Loctite 567, the cylinder functioned perfectly. Page 38-3 of the Van's plans suggest using fuel lube or a similar thread sealant to seal the fittings. Matco's recommendation is to use Loctite 567 which is a very different product. This also matches the recommendation of my local A&Ps. The only really good thing that came out of this is I can now bleed my brakes in under 5 minutes - practise does make perfect. As a side note, they mentioned that there was dust / debris on the top of the cylinder that accumulated during my build. They cautioned that this should be cleaned off as it could cause a problem with the seal where the shaft exits the cylinder. Although I have been cleaning fairly often, I never even thought about the top of the cylinders. It is something to keep in mind. Cheers Les #40643 I can almost see the light at the end of the tunnel PS: Matco was very, very helpful throughout all of this. ________________________________ Message 3 _____________________________________ Time: 10:37:21 AM PST US From: Nikolaos Napoli Subject: Re: RV10-List: Re: Pitot tube mast I installed the gretz. Its pretty straightforward and appears sturdy. Havent flown it yet. Dont know how it compares to others. Niko On Feb 9, 2012, at 9:17 PM, Kelly McMullen wrote: > > Thanks Bill. I was beginning to wonder if my question made it to the > list. I know some used the Gretz....arguments for it? > > On Thu, Feb 9, 2012 at 5:53 PM, bill.peyton wrote: >> >> I installed the safeair. The quality looks fine and the install was not difficult. >> >> -------- >> Bill Peyton >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=365997#365997 >> >> >> >> >> >> >> >> >> >> > > > > > ________________________________ Message 4 _____________________________________ Time: 11:11:50 AM PST US From: Tim Olson Subject: Re: RV10-List: Re: Pitot tube mast While the only one I know is the Gretz, I've been happy with it. I bought it only for it's thermostatic control. I leave it on for long periods of time and I see by the lights that it only cycles as-needed. So from an energy (battery) conservation perspective, I like it. That said, I'd probably not be too unhappy with any good heated pitot. The gretz mount I liked either way. Tim On 2/10/2012 12:36 PM, Nikolaos Napoli wrote: > --> RV10-List message posted by: Nikolaos Napoli > > I installed the gretz. Its pretty straightforward and appears sturdy. Havent flown it yet. Dont know how it compares to others. > > Niko > > > On Feb 9, 2012, at 9:17 PM, Kelly McMullen wrote: > >> --> RV10-List message posted by: Kelly McMullen >> >> Thanks Bill. I was beginning to wonder if my question made it to the >> list. I know some used the Gretz....arguments for it? >> >> On Thu, Feb 9, 2012 at 5:53 PM, bill.peyton wrote: >>> --> RV10-List message posted by: "bill.peyton" >>> >>> I installed the safeair. The quality looks fine and the install was not difficult. >>> >>> -------- >>> Bill Peyton >>> ________________________________ Message 5 _____________________________________ Time: 12:53:00 PM PST US Subject: Re: RV10-List: Re: Pitot tube mast From: Rob Kochman I used the Dynon pitot in the Gretz mount. No complaints so far. As Tim notes, the thermostatic control really seems to save power. On Fri, Feb 10, 2012 at 11:09 AM, Tim Olson wrote: > > While the only one I know is the Gretz, I've been happy with it. > I bought it only for it's thermostatic control. I leave it > on for long periods of time and I see by the lights that it > only cycles as-needed. So from an energy (battery) conservation > perspective, I like it. That said, I'd probably not be too > unhappy with any good heated pitot. The gretz mount I liked > either way. > > Tim > > > On 2/10/2012 12:36 PM, Nikolaos Napoli wrote: > >> --> RV10-List message posted by: Nikolaos Napoli >> >> I installed the gretz. Its pretty straightforward and appears sturdy. >> Havent flown it yet. Dont know how it compares to others. >> >> Niko >> >> >> On Feb 9, 2012, at 9:17 PM, Kelly McMullen wrote: >> >> --> RV10-List message posted by: Kelly McMullen >>> >>> Thanks Bill. I was beginning to wonder if my question made it to the >>> list. I know some used the Gretz....arguments for it? >>> >>> On Thu, Feb 9, 2012 at 5:53 PM, bill.peyton> >>> wrote: >>> >>>> --> RV10-List message posted by: "bill.peyton">>> sbcglobal.net > >>>> >>>> I installed the safeair. The quality looks fine and the install was >>>> not difficult. >>>> >>>> -------- >>>> Bill Peyton >>>> >>>> > > -- Rob Kochman RV-10 Flying since March 2011 Woodinville, WA http://kochman.net/N819K ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv10-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV10-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv10-list Browse Digests http://www.matronics.com/digest/rv10-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.