Today's Message Index:
----------------------
1. 08:50 AM - Re: vm1000 DPU orientation (Tim Bryan)
2. 09:13 AM - Re: vm1000 DPU orientation (Bruce Gray)
3. 02:14 PM - Leaking QB Tanks (James H Nelson)
4. 02:19 PM - Re: vm1000 DPU orientation (tom sargent)
5. 03:06 PM - Re: Leaking QB Tanks (Larry Pardue)
6. 04:47 PM - Re: Leaking QB Tanks (Doug Morrison)
7. 05:56 PM - Re: Leaking QB Tanks (RICHARD MILLER)
8. 06:16 PM - Re: Leaking QB Tanks (Kelly McMullen)
9. 06:30 PM - Re: Leaking QB Tanks (Kevin Horton)
10. 06:51 PM - Re: Leaking QB Tanks (Larry Pardue)
11. 06:55 PM - Re: Leaking QB Tanks (Jerry Springer)
12. 07:42 PM - Re: Leaking QB Tanks (Doug Morrison)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | vm1000 DPU orientation |
Hi Tom,
I don't recall there being any orientation to the DPU but there isn't
anything inside that would matter. I have been inside mine to change a
circuit board and there isn't anything but electronics. You probably
already know this, but there isn't much support or parts available for the
VM1000 anymore. The company website had said they were forced to move to
Texas last year and now it says they have moved to Costa Mesa, Ca. The
original owner who knew anything about the VM1000 left the company
unexpectedly. Have you checked on the ability to upgrade the unit to their
latest product? The newer VM 1000C is less money and better product. If
mine had not been already installed I would have tried to upgrade it. Just
a thought.
Tim Bryan
RV-6 Flying
N616TB over 100 hours now
> -----Original Message-----
> From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-
> server@matronics.com] On Behalf Of tom sargent
> Sent: Saturday, August 02, 2008 2:01 AM
> To: rv-list@matronics.com
> Subject: RV-List: vm1000 DPU orientation
>
>
> I have an old Vision Micro VM1000. Does any one recall if there is any
> orientation restriction on the DPU (digital processor unit) box? The
> manual doesn't indicate any preference, but the thing does have some
> socketed parts in it, which will be upside down if I mount it the way I
> want to.
>
> Thanks,
> --
> Tom S., RV-6A
>
>
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | vm1000 DPU orientation |
If you have an older VM1000C, JPI will upgrade it to the new VM1000C for
free. The new one is a JPI EMD900 in the VM1000C case.
Bruce
www.Glasair.org
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Tim Bryan
Sent: Sunday, August 03, 2008 11:44 AM
Subject: RE: RV-List: vm1000 DPU orientation
Hi Tom,
I don't recall there being any orientation to the DPU but there isn't
anything inside that would matter. I have been inside mine to change a
circuit board and there isn't anything but electronics. You probably
already know this, but there isn't much support or parts available for the
VM1000 anymore. The company website had said they were forced to move to
Texas last year and now it says they have moved to Costa Mesa, Ca. The
original owner who knew anything about the VM1000 left the company
unexpectedly. Have you checked on the ability to upgrade the unit to their
latest product? The newer VM 1000C is less money and better product. If
mine had not been already installed I would have tried to upgrade it. Just
a thought.
Tim Bryan
RV-6 Flying
N616TB over 100 hours now
> -----Original Message-----
> From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-
> server@matronics.com] On Behalf Of tom sargent
> Sent: Saturday, August 02, 2008 2:01 AM
> To: rv-list@matronics.com
> Subject: RV-List: vm1000 DPU orientation
>
>
> I have an old Vision Micro VM1000. Does any one recall if there is
> any orientation restriction on the DPU (digital processor unit) box?
> The manual doesn't indicate any preference, but the thing does have
> some socketed parts in it, which will be upside down if I mount it the
> way I want to.
>
> Thanks,
> --
> Tom S., RV-6A
>
>
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Leaking QB Tanks |
List:
I have a QB RV9-A and I have a leaking left tank. The unusual part is-
the pro seal is softening with the 100LL. On the spar end of the last
rib, the leak begins about half the way down and around the bottom and
almost to the leading edge. The pro seal is soft enough to act like
grease. You can wipe it from the aluminum skin. Not firm and stiff
like it is suppose to. I keep my tanks full after every flight so the
whole rib is subjected to fuel. It is only on the left tank and the
right one is fine. My guru / EAA inspector here has had two tanks which
leaked on other QB RV's. He is building a 9-A also and they all have
passed the balloon test. But he is now questioning the pro seal on his
tanks. Has any others had the same problem? I hope I can clean the pro
seal away and put on some new sealant and stop the problem. A message is
going to Van's also about my problem.
Jim Nelson
RV9-A
N15JN (5 hours)
____________________________________________________________
Play it loud with a new car stereo! Click here!
http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3n6nDMYKsoIPPJLox55cJRk0c37EpWd00895opHbzZFHtA4j/
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: vm1000 DPU orientation |
Bruce:
I didn't know that (kind of late for me since all the sensors are
installed). Doesn't the newer unit use a different type of sensor?
You'd be starting from scratch to switch to the new unit.
Here is a lesson to all builders: Delay the purchase of your
electronics/avionics as long as possible. I bought my vm1000 early
because I was offered a deal on it. Big mistake. (Well, I have to
admit that taking 10 years to finish the project gives you more
opportunities to make such mistakes.)
--
Tom S., RV-6A
Bruce Gray wrote:
>
> If you have an older VM1000C, JPI will upgrade it to the new VM1000C for
> free. The new one is a JPI EMD900 in the VM1000C case.
>
> Bruce
> www.Glasair.org
Message 5
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Leaking QB Tanks |
On Aug 3, 2008, at 3:09 PM, James H Nelson wrote:
>
> List:
> I have a QB RV9-A and I have a leaking left tank. The unusual part
> is-
> the pro seal is softening with the 100LL. On the spar end of the last
> rib, the leak begins about half the way down and around the bottom and
> almost to the leading edge. The pro seal is soft enough to act like
> grease. You can wipe it from the aluminum skin. Not firm and stiff
> like it is suppose to...Has any others had the same problem?
Exactly what happened to my quick-build tank. Pictures here http://
www.vansairforce.com/community/showthread.php?t=26159&highlight=sealant
Message 6
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Leaking QB Tanks |
Gentlemen,
This problem is not just related to the relatively new quick-build
tanks. Last week I found the same problem with one of the fuel tanks on
an RV-4 (1993) I recently purchased. The previous owner (original
builder) repaired a small leak in the tank a few years ago and is very
confident that the pro-seal he applied was done correctly. We were both
very surprised to find most of the pro-seal on the lower portion of the
tank soft and gooey. The pro-seal on the upper portion of the tank is
still hard. Another local builder had the same problem with one of his
-8 QB tanks. It appears that this is a somewhat common problem on tanks
that have been leaking for an extended period of time. I found the
following comments on another RV list:
The proseal on my lhs wing inner rib has gone totally sticky [can smear
it off with a finger] after flying with a leaking tank for 2 months. The
wings are quickbuilt and the inspection cover was leaking. Avgas has
leaked onto the factory applied proseal on the bottom of the inner rib.
[just below the cover]
I queried this with Vans and they said that the blue dye in avgas and
oxygen cause the proseal to soften. I cannot argue with them, but they
couldnt explain why this happened.
The proseal that did not have fuel leaking on it is ok.
I know I should have attended to the leak sooner, but flying was more
important at the time. Had I known I would have taken care of it sooner.
What I still dont understand is why the proseal went totally soft. Can
anyone explain ??
Gus at Vans said that there are no fuel fumes on the outside of the
tank, so as the fuel drips onto the proseal, it evaporates and leaves
the blue dye behind. This will lead to the proseal becoming soft and
sticky and resembles uncured proseal. At least this is how I understand it.
I asked how its possible because it is a fuel sealer, and he said they
are not quite sure.
Basically they say its my fault, [which I wont dispute as the inspection
cover had weeped fuel for 2 months] ,but i still would like a technical
explanation why this happened.[ie why the proseal softened]
Either way I have to sort it out.
It is the bead of proseal from the leading edge to the rear spar on the
outside of the inner rib that has gone soft.
I've seen this on a re-seal job that was done on our Cessna Cardinal. I
scraped it all out of our tanks and reapplied with new/good proseal.
That is NOT normal, don't believe Van's on this one.
Vans has been promising to speak to their supplier to get me the facts.
I have been patiently waiting for a answer ,but none yet. The clearly
told me they mixed it correctly and that it was my fault it went
soft.[fuel shouldnt leak on it]
I dont want to make a issue about it, but feel a bit short changed at
the moment. Vans has always been great about sorting out issues. I
wonder why they are avoiding this one ??
As I said before, if its my fault ,so be it. However everyone I speak to
says its not, and Vans doesnt seem to agree.
My plan is to gently scrape & wipe off the soft stuff, scratch up the
aluminum surface, and re-apply fresh pro-seal I purchased from Van's.
Regards,
Doug Morrison
RV-4 (N818WW)
RV-8A (N666NJ Reserved) (In the process of converting to a -8)
Larry Pardue wrote:
>
>
> On Aug 3, 2008, at 3:09 PM, James H Nelson wrote:
>
>>
>> List:
>> I have a QB RV9-A and I have a leaking left tank. The unusual part is-
>> the pro seal is softening with the 100LL. On the spar end of the last
>> rib, the leak begins about half the way down and around the bottom and
>> almost to the leading edge. The pro seal is soft enough to act like
>> grease. You can wipe it from the aluminum skin. Not firm and stiff
>> like it is suppose to...Has any others had the same problem?
>
>
> Exactly what happened to my quick-build tank. Pictures here http://
> www.vansairforce.com/community/showthread.php?t=26159&highlight=sealant
>
>
Message 7
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Leaking QB Tanks |
proseal applied and cured per the spec does not disolve with 100ll. so what
happened.
-
are you using marvel mystry oil. or any other fuel additive.
-
-if not i would have to think that the proseal was stored improperly or o
ut of date. excessive heat and time will screwup- proseal still in the ca
n. since this is a quick build with only 5 hrs on it. i would be requesting
two new tanks since the other was probably built with the same bad proseal
. and a payment for the cost of painting. remember all of the material for
the q biuld are shipped ocean cargo to the pi. and without climate controll
s on the container. it is quite possible that the material saw in excess of
150 degrees inside the container.
-
please tell us what happens, if vans does not stand behind thier q builds i
t might be a good time to have the local faa give them a chat.
-
i have repaired more of this type of tank then you can shake a stick at, so
call me if you have to do it yourself. be happy to help with advice.
-
ps
i am replacing the bonded doublers on a exec helicopter rotor blades right
now , it is my thought that the epoxy used was probably out of date and fai
led as a result. having way to much fun removing it.
-
rick miller
559-270-7113
a+p, i/a
-
--- On Sun, 8/3/08, Doug Morrison <rv8a.doug@net-lynx.com> wrote:
From: Doug Morrison <rv8a.doug@net-lynx.com>
Subject: Re: RV-List: Leaking QB Tanks
Gentlemen,
This problem is not just related to the relatively new quick-build tanks. L
ast week I found the same problem with one of the fuel tanks on an RV-4 (19
93) I recently purchased. The previous owner (original builder) repaired a
small leak in the tank a few years ago and is very confident that the pro-s
eal he applied was done correctly. We were both very surprised to find most
of the pro-seal on the lower portion of the tank soft and gooey. The pro-s
eal on the upper portion of the tank is still hard. Another local builder h
ad the same problem with one of his -8 QB tanks. It appears that this is a
somewhat common problem on tanks that have been leaking for an extended per
iod of time. I found the following comments on another RV list:
The proseal on my lhs wing inner rib has gone totally sticky [can smear it
off with a finger] after flying with a leaking tank for 2 months. The wings
are quickbuilt and the inspection cover was leaking. Avgas has leaked onto
the factory applied proseal on the bottom of the inner rib. [just below th
e cover]
I queried this with Vans and they said that the blue dye in avgas and oxyge
n cause the proseal to soften. I cannot argue with them, but they couldnt e
xplain why this happened.
The proseal that did not have fuel leaking on it is ok.
I know I should have attended to the leak sooner, but flying was more impor
tant at the time. Had I known I would have taken care of it sooner.
What I still dont understand is why the proseal went totally soft. Can anyo
ne explain ??
Gus at Vans said that there are no fuel fumes on the outside of the tank, s
o as the fuel drips onto the proseal, it evaporates and leaves the blue dye
behind. This will lead to the proseal becoming soft and sticky and resembl
es uncured proseal. At least this is how I understand it.
I asked how its possible because it is a fuel sealer, and he said they are
not quite sure.
Basically they say its my fault, [which I wont dispute as the inspection co
ver had weeped fuel for 2 months] ,but i still would like a technical expla
nation why this happened.[ie why the proseal softened]
Either way I have to sort it out.
It is the bead of proseal from the leading edge to the rear spar on the out
side of the inner rib that has gone soft.
I've seen this on a re-seal job that was done on our Cessna Cardinal. I scr
aped it all out of our tanks and reapplied with new/good proseal. That is N
OT normal, don't believe Van's on this one.
Vans has been promising to speak to their supplier to get me the facts. I h
ave been patiently waiting for a answer ,but none yet. The clearly told me
they mixed it correctly and that it was my fault it went soft.[fuel shouldn
t leak on it]
I dont want to make a issue about it, but feel a bit short changed at the m
oment. Vans has always been great about sorting out issues. I wonder why th
ey are avoiding this one ??
As I said before, if its my fault ,so be it. However everyone I speak to sa
ys its not, and Vans doesnt seem to agree.
My plan is to gently scrape & wipe off the soft stuff, scratch up the alumi
num surface, and re-apply fresh pro-seal I purchased from Van's.
Regards,
Doug Morrison
RV-4 (N818WW)
RV-8A (N666NJ Reserved) (In the process of converting to a -8)
Larry Pardue wrote:
On Aug 3, 2008, at 3:09 PM, James H Nelson wrote:
List:
I have a QB RV9-A and I have a leaking left tank.- The unusual part- is
-
the pro seal is softening with the 100LL.- On the spar end of the last
rib, the leak begins about half the way down and around the bottom and
almost to the leading edge.- The pro seal is soft enough to act like
grease.- You can wipe it from the aluminum- skin.- Not firm and stiff
like it is suppose to...Has any others had the same problem?
Exactly what happened to my quick-build tank. Pictures here http:// www.van
sairforce.com/community/showthread.php?t=26159&highlight=sealant
=0A=0A=0A
Message 8
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Leaking QB Tanks |
Any chance mogas was used in any of these tanks? I've seen Proseal
reduced to jelly/peanut butter by mogas.
Doug Morrison wrote:
> Gentlemen,
>
> This problem is not just related to the relatively new quick-build
> tanks. Last week I found the same problem with one of the fuel tanks
> on an RV-4 (1993) I recently purchased. The previous owner (original
> builder) repaired a small leak in the tank a few years ago and is very
> confident that the pro-seal he applied was done correctly. We were
> both very surprised to find most of the pro-seal on the lower portion
> of the tank soft and gooey. The pro-seal on the upper portion of the
> tank is still hard. Another local builder had the same problem with
> one of his -8 QB tanks. It appears that this is a somewhat common
> problem on tanks that have been leaking for an extended period of
> time. I found the following comments on another RV list:
>
> The proseal on my lhs wing inner rib has gone totally sticky [can
> smear it off with a finger] after flying with a leaking tank for 2
> months. The wings are quickbuilt and the inspection cover was leaking.
> Avgas has leaked onto the factory applied proseal on the bottom of the
> inner rib. [just below the cover]
> I queried this with Vans and they said that the blue dye in avgas and
> oxygen cause the proseal to soften. I cannot argue with them, but they
> couldnt explain why this happened.
> The proseal that did not have fuel leaking on it is ok.
> I know I should have attended to the leak sooner, but flying was more
> important at the time. Had I known I would have taken care of it sooner.
> What I still dont understand is why the proseal went totally soft. Can
> anyone explain ??
>
> Gus at Vans said that there are no fuel fumes on the outside of the
> tank, so as the fuel drips onto the proseal, it evaporates and leaves
> the blue dye behind. This will lead to the proseal becoming soft and
> sticky and resembles uncured proseal. At least this is how I
> understand it.
> I asked how its possible because it is a fuel sealer, and he said they
> are not quite sure.
> Basically they say its my fault, [which I wont dispute as the
> inspection cover had weeped fuel for 2 months] ,but i still would like
> a technical explanation why this happened.[ie why the proseal softened]
> Either way I have to sort it out.
> It is the bead of proseal from the leading edge to the rear spar on
> the outside of the inner rib that has gone soft.
>
> I've seen this on a re-seal job that was done on our Cessna Cardinal.
> I scraped it all out of our tanks and reapplied with new/good proseal.
> That is NOT normal, don't believe Van's on this one.
>
> Vans has been promising to speak to their supplier to get me the
> facts. I have been patiently waiting for a answer ,but none yet. The
> clearly told me they mixed it correctly and that it was my fault it
> went soft.[fuel shouldnt leak on it]
> I dont want to make a issue about it, but feel a bit short changed at
> the moment. Vans has always been great about sorting out issues. I
> wonder why they are avoiding this one ??
> As I said before, if its my fault ,so be it. However everyone I speak
> to says its not, and Vans doesnt seem to agree.
>
>
> My plan is to gently scrape & wipe off the soft stuff, scratch up the
> aluminum surface, and re-apply fresh pro-seal I purchased from Van's.
>
> Regards,
>
> Doug Morrison
>
> RV-4 (N818WW)
> RV-8A (N666NJ Reserved) (In the process of converting to a -8)
>
>
> Larry Pardue wrote:
>>
>>
>> On Aug 3, 2008, at 3:09 PM, James H Nelson wrote:
>>
>>>
>>> List:
>>> I have a QB RV9-A and I have a leaking left tank. The unusual part
>>> is-
>>> the pro seal is softening with the 100LL. On the spar end of the last
>>> rib, the leak begins about half the way down and around the bottom and
>>> almost to the leading edge. The pro seal is soft enough to act like
>>> grease. You can wipe it from the aluminum skin. Not firm and stiff
>>> like it is suppose to...Has any others had the same problem?
>>
>> Exactly what happened to my quick-build tank. Pictures here http://
>> www.vansairforce.com/community/showthread.php?t=26159&highlight=sealant
>>
>>
>>
>>
>>
>>
>>
Message 9
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Leaking QB Tanks |
On 3 Aug 2008, at 20:50, RICHARD MILLER wrote:
> please tell us what happens, if vans does not stand behind thier q
> builds it might be a good time to have the local faa give them a chat.
>
These are not type-certificated aircraft, so FAR 39 (Airworthiness
Directives) does not apply. If the local FAA wanted to talk to Van's
about this, which FAR subparagraph should they discuss?
--
Kevin Horton
RV-8 (FInal Assembly)
Ottawa, Canada
http://www.kilohotel.com/rv8
Message 10
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Leaking QB Tanks |
On Aug 3, 2008, at 7:11 PM, Kelly McMullen wrote:
>
> Any chance mogas was used in any of these tanks? I've seen Proseal
> reduced to jelly/peanut butter by mogas.
My tanks have never had anything in them but 100LL avgas.
Larry Pardue
>
>>> <n5lp@warpdriveonline.com>
>>>
>>>
>>> Exactly what happened to my quick-build tank. Pictures here
>>> http:// www.vansairforce.com/community/showthread.php?
>>> t=26159&highlight=sealant
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>
>
Message 11
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Leaking QB Tanks |
RICHARD MILLER wrote:
>
> time to have the local faa give them a chat.
>
>
> rick miller
> 559-270-7113
> a+p, i/a
>
Give them a chat, what for? The FAA did not build it.
Message 12
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Leaking QB Tanks |
List,
I'll use Richard's message to answer his and John's, Kelly's, &
Kevin's. Remember the comment in red below are from a Vansairforce.net
thread. They are not my comments.
1) Use of a plastic scraper and MEK to remove the soft pro-seal sounds
like a good idea.
2) I am fairly confident that oil additives and mogas have never been
used in my -4 (circa 1993) or my friends -8 QB. The only commonality is
that the tanks were leaking for an extended period of time.
3) The previous owner of my -4 is fairly confident that the pro-seal he
used was fresh and mixed in the proper ratio.
4) The pro-seal on the QB tanks of the -8A I have under construction is
full cured. Only time will tell if the pro-seal will soften up when
exposed to fuel in the tank.
5) I am very satisfied with the workmanship of my -8A QB. If the tanks
begin to leak due to outdated pro-seal used at the time of manufacturer,
I will fix the problem and move on. Of course I will advise Van's of the
problem so they can revise their manufacture procedure and hopefully
prevent the problem in the future. To be safe, I will probably fill the
tanks with fuel (with the tanks off the wing) and let them sit for a few
months before I begin painting and final assembly. Any leaks or pro-seal
softening should show up during that time.
As far as I am concerned, the -8A kit is a real bargain, even with the
inevitable anomalies. Each of you will have to decide if you want to
press the issue with Van's. Personally, I am prepared to accept a few
minor problems and just move on. Also, getting the FAA involved would be
the last thing I would do.
Thanks for everyone's comments.
Regards,
Doug Morrison
RICHARD MILLER wrote:
> proseal applied and cured per the spec does not disolve with 100ll. so
> what happened.
>
> are you using marvel mystry oil. or any other fuel additive.
>
> if not i would have to think that the proseal was stored improperly
> or out of date. excessive heat and time will screwup proseal still in
> the can. since this is a quick build with only 5 hrs on it. i would be
> requesting two new tanks since the other was probably built with the
> same bad proseal. and a payment for the cost of painting. remember all
> of the material for the q biuld are shipped ocean cargo to the pi. and
> without climate controlls on the container. it is quite possible that
> the material saw in excess of 150 degrees inside the container.
>
> please tell us what happens, if vans does not stand behind thier q
> builds it might be a good time to have the local faa give them a chat.
>
> i have repaired more of this type of tank then you can shake a stick
> at, so call me if you have to do it yourself. be happy to help with
> advice.
>
> ps
> i am replacing the bonded doublers on a exec helicopter rotor blades
> right now , it is my thought that the epoxy used was probably out of
> date and failed as a result. having way to much fun removing it.
>
> rick miller
> 559-270-7113
> a+p, i/a
>
>
>
> --- On Sun, 8/3/08, Doug Morrison <rv8a.doug@net-lynx.com> wrote:
>
> From: Doug Morrison <rv8a.doug@net-lynx.com>
> Subject: Re: RV-List: Leaking QB Tanks
> To: rv-list@matronics.com
> Date: Sunday, August 3, 2008, 4:41 PM
>
> Gentlemen,
>
> This problem is not just related to the relatively new quick-build
> tanks. Last week I found the same problem with one of the fuel
> tanks on an RV-4 (1993) I recently purchased. The previous owner
> (original builder) repaired a small leak in the tank a few years
> ago and is very confident that the pro-seal he applied was done
> correctly. We were both very surprised to find most of the
> pro-seal on the lower portion of the tank soft and gooey. The
> pro-seal on the upper portion of the tank is still hard. Another
> local builder had the same problem with one of his -8 QB tanks. It
> appears that this is a somewhat common problem on tanks that have
> been leaking for an extended period of time. I found the following
> comments on another RV list:
>
> The proseal on my lhs wing inner rib has gone totally sticky [can
> smear it off with a finger] after flying with a leaking tank for 2
> months. The wings are quickbuilt and the inspection cover was
> leaking. Avgas has leaked onto the factory applied proseal on the
> bottom of the inner rib. [just below the cover]
> I queried this with Vans and they said that the blue dye in avgas
> and oxygen cause the proseal to soften. I cannot argue with them,
> but they couldnt explain why this happened.
> The proseal that did not have fuel leaking on it is ok.
> I know I should have attended to the leak sooner, but flying was
> more important at the time. Had I known I would have taken care of
> it sooner.
> What I still dont understand is why the proseal went totally soft.
> Can anyone explain ??
>
> Gus at Vans said that there are no fuel fumes on the outside of
> the tank, so as the fuel drips onto the proseal, it evaporates and
> leaves the blue dye behind. This will lead to the proseal becoming
> soft and sticky and resembles uncured proseal. At least this is
> how I understand it.
> I asked how its possible because it is a fuel sealer, and he said
> they are not quite sure.
> Basically they say its my fault, [which I wont dispute as the
> inspection cover had weeped fuel for 2 months] ,but i still would
> like a technical explanation why this happened.[ie why the proseal
> softened]
> Either way I have to sort it out.
> It is the bead of proseal from the leading edge to the rear spar
> on the outside of the inner rib that has gone soft.
>
> I've seen this on a re-seal job that was done on our Cessna
> Cardinal. I scraped it all out of our tanks and reapplied with
> new/good proseal. That is NOT normal, don't believe Van's on this one.
>
> Vans has been promising to speak to their supplier to get me the
> facts. I have been patiently waiting for a answer ,but none yet.
> The clearly told me they mixed it correctly and that it was my
> fault it went soft.[fuel shouldnt leak on it]
> I dont want to make a issue about it, but feel a bit short changed
> at the moment. Vans has always been great about sorting out
> issues. I wonder why they are avoiding this one ??
> As I said before, if its my fault ,so be it. However everyone I
> speak to says its not, and Vans doesnt seem to agree.
>
>
> My plan is to gently scrape & wipe off the soft stuff, scratch up
> the aluminum surface, and re-apply fresh pro-seal I purchased from
> Van's.
>
> Regards,
>
> Doug Morrison
>
> RV-4 (N818WW)
> RV-8A (N666NJ Reserved) (In the process of converting to a -8)
>
>
> Larry Pardue wrote:
>
>> <n5lp@warpdriveonline.com>
>>
>>
>> On Aug 3, 2008, at 3:09 PM, James H Nelson wrote:
>>
>>>
>>> List:
>>> I have a QB RV9-A and I have a leaking left tank. The unusual
>>> part is-
>>> the pro seal is softening with the 100LL. On the spar end of
>>> the last
>>> rib, the leak begins about half the way down and around the
>>> bottom and
>>> almost to the leading edge. The pro seal is soft enough to act
>>> like
>>> grease. You can wipe it from the aluminum skin. Not firm and
>>> stiff
>>> like it is suppose to...Has any others had the same problem?
>>
>>
>> Exactly what happened to my quick-build tank. Pictures here
>> http://
>> www.vansairforce.com/community/showthread.php?t=26159&highlight=sealant
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|