Today's Message Index:
----------------------
1. 09:42 AM - GPS antenna mounting (Ed Godfrey)
2. 10:32 AM - Re: GPS antenna mounting (Phillip Perry)
3. 02:50 PM - Re: GPS antenna mounting (Kelly McMullen)
4. 04:43 PM - Re: GPS antenna mounting (Bob Turner)
5. 05:10 PM - Re: Re: GPS antenna mounting (David Maib)
6. 06:14 PM - Re: Re: GPS antenna mounting (Ed Godfrey)
7. 06:17 PM - Brake fluid seeping from master cylinders (Dan Charrois)
8. 06:36 PM - Re: Brake fluid seeping from master cylinders (Tim Olson)
9. 07:47 PM - Re: Brake fluid seeping from master cylinders (kearney)
10. 08:44 PM - Re: Re: GPS antenna mounting (Marcus Cooper)
11. 09:11 PM - Re: Brake fluid seeping from master cylinders (Bob Turner)
12. 09:23 PM - Re: GPS antenna mounting (Bob Turner)
13. 10:41 PM - Re: Re: Brake fluid seeping from master cylinders (Dan Charrois)
Message 1
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| Subject: | GPS antenna mounting |
I would like to ask, of those who mounted your GPS antenna on the
cabin top, are you getting the performance from it that you expected?
Did you install a ground plane? Also, what screws did you use to mount
it. I have been looking for some MS24693-C286 screws and am not coming
up with anything. Thanks.
Ed Godfrey
Message 2
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| Subject: | Re: GPS antenna mounting |
I have been very happy with my performance so far. The only thing I wish I had
considered was installing them under the glass cabin top and inside my overhead
air console. It would have been nice to not ouch a hole in the top of the
plane and also protect the antenna from the WX and UV; hopefully extending the
life of the antenna and rescuing another leak point to seal up.
But the top has served me well to this point. Others might be able to comment
on the performance inside the overhead air (if you have it). Just something
to consider.
Phil
Sent from my iPhone
> On Aug 6, 2017, at 11:42 AM, Ed Godfrey <egodfrey@ameritech.net> wrote:
>
>
> I would like to ask, of those who mounted your GPS antenna on the cabin top,
are you getting the performance from it that you expected? Did you install
a ground plane? Also, what screws did you use to mount it. I have been looking
for some MS24693-C286 screws and am not coming up with anything. Thanks.
>
> Ed Godfrey
>
>
>
Message 3
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| Subject: | Re: GPS antenna mounting |
I look at GPS antenna location based on the purpose and approval basis
of the antenna. For my GTN650 to meet IFR performance standards, I
mounted on cabin top with the recommended ground plane (partly sheet
metal, partly aluminum foil) per Garmin instructions. For the GPS that
drives my EFIS display, I mounted it in front of the firewall, perhaps
10", underneath the cowling. If mounting GPS antenna to drive ADS-B
out, I would try to follow manufacturer's recommendations.
The Garmin needs a better view of the sky and takes longer to lock on
than my Dynon, but it has more required validation to perform.
On 8/6/2017 9:42 AM, Ed Godfrey wrote:
>
> I would like to ask, of those who mounted your GPS antenna on the
> cabin top, are you getting the performance from it that you expected?
> Did you install a ground plane? Also, what screws did you use to mount
> it. I have been looking for some MS24693-C286 screws and am not coming
> up with anything. Thanks.
>
> Ed Godfrey
>
>
>
Message 4
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| Subject: | Re: GPS antenna mounting |
I mounted mine on top of the skin, a foot behind the baggage bulkhead:
1. This area has metal skin so the ground plane is there. I did use a doubler.
2. My 420W required a certain MINIMUM coax run, so there was no "extra" coax involved
in this location.
3. My guess was that there was slightly less drag in this location (top of the
cabin is convex which will speed up the airflow a bit).
Works fine.
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=471558#471558
Message 5
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| Subject: | Re: GPS antenna mounting |
I did exactly the same thing Bob Turner did. Works great.
David Maib
> On Aug 6, 2017, at 7:43 PM, Bob Turner <bobturner@alum.rpi.edu> wrote:
>
>
> I mounted mine on top of the skin, a foot behind the baggage bulkhead:
> 1. This area has metal skin so the ground plane is there. I did use a doubler.
> 2. My 420W required a certain MINIMUM coax run, so there was no "extra" coax
involved in this location.
> 3. My guess was that there was slightly less drag in this location (top of the
cabin is convex which will speed up the airflow a bit).
>
> Works fine.
>
> --------
> Bob Turner
> RV-10 QB
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=471558#471558
>
>
>
>
>
>
>
>
>
Message 6
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| Subject: | Re: GPS antenna mounting |
Bob and David,
I was considering putting it back there, but I ran into issues
with the separation of the GPS antenna, a comm antenna and the ELT antenna.
Ed
On 8/6/2017 7:09 PM, David Maib wrote:
>
> I did exactly the same thing Bob Turner did. Works great.
>
> David Maib
>
>
>> On Aug 6, 2017, at 7:43 PM, Bob Turner <bobturner@alum.rpi.edu> wrote:
>>
>>
>> I mounted mine on top of the skin, a foot behind the baggage bulkhead:
>> 1. This area has metal skin so the ground plane is there. I did use a doubler.
>> 2. My 420W required a certain MINIMUM coax run, so there was no "extra" coax
involved in this location.
>> 3. My guess was that there was slightly less drag in this location (top of the
cabin is convex which will speed up the airflow a bit).
>>
>> Works fine.
>>
>> --------
>> Bob Turner
>> RV-10 QB
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=471558#471558
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 7
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| Subject: | Brake fluid seeping from master cylinders |
A few weeks ago, I discovered that I had a small brake fluid leak on the left brake
of the pilot's side. It was on the upper (low pressure) port of the cylinder,
and very small - probably less than a drop a day. I tightened the nut on
the hose going to the elbow and that didn't seem to help, so I rotated the elbow
another 360 degrees clockwise and that seemed to do the trick (though NPT
threads mean I can't just tighten indiscriminately - I have to be careful not
to over tighten, though it has to end up pointing upwards).
In any event, I thought the problem was solved, but about a week ago I saw there
was still some slight seepage. It hasn't been enough to cause a noticeable
drip (at least not yet), but if I run my finger along the bottom lip of the cylinder,
it comes away with a bit of brake fluid residue. And I noticed something
similar on the copilot's side brakes too just recently, though they seemed
dry before. Maybe the higher temperatures of summer caused a few things to resize
a bit.
In any case, I'm hesitant to just tighten all the fittings another 360 turn since
I don't want to over tighten them and have the master cylinders crack. The
seepage isn't when the brakes are used - at least, I can't detect any leaks specifically
caused by putting pressure on the pedals. It's just that when the
plane sits in the hangar for a few days, I can see residue building up. The
current rate of seepage is so small (probably several days for one drop of brake
fluid) that I don't really worry about having the reservoir run out between
annuals or oil changes (I'm checking it every time I change oil and remove the
top cowl and it doesn't seem to noticeably decrease).
Is this something that anyone else has seen? I can live with it by just wiping
down the cylinders every week or two. But in the effort to make things perfect,
does anyone have any suggestions? I know Van's recommends strongly to not
use Teflon tape on the fittings. I'm pretty sure I used Boelube at the time,
though that was several years ago. Does its effectivity diminish over time?
I can easily remove all the fittings and put more Boelube on the NPT threads
if that likely help fix the problem, though the necessity of my having to re-bleed
the brake lines after that disassembly gives me pause, especially since I
think I used Boelube in the first place so I'm not sure it would help in the
long term anyway.
Everything is built exactly according to Van's plans, using the hoses, etc. they
provided with the kit. I know lots of people use stainless braided hoses everywhere,
but the problem seems to stem from the elbow fitting, not the hoses.
Any suggestions?
Thanks! Dan
---
Dan Charrois
President, Syzygy Research & Technology
Phone: 780-961-2213
Message 8
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| Subject: | Re: Brake fluid seeping from master cylinders |
Use the liquid teflon sealants...that will do the trick. I think I use loctite
567 but the stuff you can buy at the auto parts store or farm and barn will do
just fine.
It's NOT the same as using teflon tape.
Tim
> On Aug 6, 2017, at 8:16 PM, Dan Charrois <dan@syz.com> wrote:
>
>
> A few weeks ago, I discovered that I had a small brake fluid leak on the left
brake of the pilot's side. It was on the upper (low pressure) port of the cylinder,
and very small - probably less than a drop a day. I tightened the nut
on the hose going to the elbow and that didn't seem to help, so I rotated the
elbow another 360 degrees clockwise and that seemed to do the trick (though NPT
threads mean I can't just tighten indiscriminately - I have to be careful not
to over tighten, though it has to end up pointing upwards).
>
> In any event, I thought the problem was solved, but about a week ago I saw there
was still some slight seepage. It hasn't been enough to cause a noticeable
drip (at least not yet), but if I run my finger along the bottom lip of the
cylinder, it comes away with a bit of brake fluid residue. And I noticed something
similar on the copilot's side brakes too just recently, though they seemed
dry before. Maybe the higher temperatures of summer caused a few things to
resize a bit.
>
> In any case, I'm hesitant to just tighten all the fittings another 360 turn since
I don't want to over tighten them and have the master cylinders crack. The
seepage isn't when the brakes are used - at least, I can't detect any leaks
specifically caused by putting pressure on the pedals. It's just that when
the plane sits in the hangar for a few days, I can see residue building up. The
current rate of seepage is so small (probably several days for one drop of
brake fluid) that I don't really worry about having the reservoir run out between
annuals or oil changes (I'm checking it every time I change oil and remove
the top cowl and it doesn't seem to noticeably decrease).
>
> Is this something that anyone else has seen? I can live with it by just wiping
down the cylinders every week or two. But in the effort to make things perfect,
does anyone have any suggestions? I know Van's recommends strongly to not
use Teflon tape on the fittings. I'm pretty sure I used Boelube at the time,
though that was several years ago. Does its effectivity diminish over time?
I can easily remove all the fittings and put more Boelube on the NPT threads
if that likely help fix the problem, though the necessity of my having to re-bleed
the brake lines after that disassembly gives me pause, especially since
I think I used Boelube in the first place so I'm not sure it would help in the
long term anyway.
>
> Everything is built exactly according to Van's plans, using the hoses, etc. they
provided with the kit. I know lots of people use stainless braided hoses
everywhere, but the problem seems to stem from the elbow fitting, not the hoses.
>
> Any suggestions?
>
> Thanks! Dan
> ---
> Dan Charrois
> President, Syzygy Research & Technology
> Phone: 780-961-2213
>
>
>
>
>
Message 9
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| Subject: | Re: Brake fluid seeping from master cylinders |
Hi Dan
I used this with great success.
https://www.amazon.ca/Permatex-80632-Thread-Sealant-PTFE/dp/B000HBNTGY/ref=sr_1_7/136-4197055-7816439?ie=UTF8&qid=1502073596&sr=8-7&keywords=permatex+thread+sealant
I had a similar issue where *apparently* I had a leak on the lower fitting of a
cylinder in the starboard side. I did everything I could to fix it. As it turns
out the leak was on the reservoir fitting that was spritzing small amounts
of fluid onto the fitting. Talk about looking in the wrong place!
Cheers
Les
C-GCWZ flying
C-GROK some assembly required
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=471574#471574
Message 10
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| Subject: | Re: GPS antenna mounting |
X3, works great mounted just aft of the fiberglass with 845 hours.
Marcus
> On Aug 6, 2017, at 8:09 PM, David Maib <dmaib@mac.com> wrote:
> Do not archive
>
> I did exactly the same thing Bob Turner did. Works great.
>
> David Maib
>
>
>> On Aug 6, 2017, at 7:43 PM, Bob Turner <bobturner@alum.rpi.edu> wrote:
>>
>>
>> I mounted mine on top of the skin, a foot behind the baggage bulkhead:
>> 1. This area has metal skin so the ground plane is there. I did use a doubler.
>> 2. My 420W required a certain MINIMUM coax run, so there was no "extra" coax
involved in this location.
>> 3. My guess was that there was slightly less drag in this location (top of the
cabin is convex which will speed up the airflow a bit).
>>
>> Works fine.
>>
>> --------
>> Bob Turner
>> RV-10 QB
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=471558#471558
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
Message 11
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| Subject: | Re: Brake fluid seeping from master cylinders |
As others said: Boelube is a lubricant. You want a pipe thread sealant. Apply sparingly,
not on the first thread. You should have used a thread sealant on all
your pipe threads (not teflon tape).
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=471577#471577
Message 12
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| Subject: | Re: GPS antenna mounting |
My ELT is 4 or 5 feet further aft, and I have no com antennas on top, so separation
from com antennas may be a concern.
Ed Godfrey wrote:
> Bob and David,
> I was considering putting it back there, but I ran into issues
> with the separation of the GPS antenna, a comm antenna and the ELT antenna.
>
> Ed
>
> On 8/6/2017 7:09 PM, David Maib wrote:
>
> >
> >
> > I did exactly the same thing Bob Turner did. Works great.
> >
> > David Maib
> >
> >
> > > On Aug 6, 2017, at 7:43 PM, Bob Turner wrote:
> > >
> > >
> > >
> > > I mounted mine on top of the skin, a foot behind the baggage bulkhead:
> > > 1. This area has metal skin so the ground plane is there. I did use a doubler.
> > > 2. My 420W required a certain MINIMUM coax run, so there was no "extra" coax
involved in this location.
> > > 3. My guess was that there was slightly less drag in this location (top of
the cabin is convex which will speed up the airflow a bit).
> > >
> > > Works fine.
> > >
> > > --------
> > > Bob Turner
> > > RV-10 QB
> > >
> > >
> > >
> > >
> > > Read this topic online here:
> > >
> > > http://forums.matronics.com/viewtopic.php?p=471558#471558
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> >
> >
>
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=471578#471578
Message 13
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| Subject: | Re: Brake fluid seeping from master cylinders |
Whoops - I misspoke. It wasn't Boelube I used on my pipe threads. I had the name
on the brain because I'd recently used it to lubricate the piano hinge pins
that go into the cowling.
I can't recall exactly, but I think the stuff I used was EZ Turn Fuel lube (described
as a lubricant/sealant).. it's in a tube and *very* gooey and sticky
:-) ... not the Boelube that's blue, in a little jar, and oily.
But with that said, it may not be the best product for the job. A thread sealant
paste like Loctite 567 or Permatex 80632 as suggested here probably would be
better suited. Just so long as it can handle brake fluid properly.
Thanks, everyone!
Dan
> On 2017-Aug-06, at 10:10 PM, Bob Turner <bobturner@alum.rpi.edu> wrote:
>
>
> As others said: Boelube is a lubricant. You want a pipe thread sealant. Apply
sparingly, not on the first thread. You should have used a thread sealant on
all your pipe threads (not teflon tape).
>
> --------
> Bob Turner
> RV-10 QB
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=471577#471577
>
>
>
>
>
>
>
>
>
---
Dan Charrois
President, Syzygy Research & Technology
Phone: 780-961-2213
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