Today's Message Index:
----------------------
1. 04:23 AM - Re: testing static system (Ralph E. Capen)
2. 04:41 AM - Re: testing static system (Fred Stucklen)
3. 05:52 AM - Re: testing static system (Kevin Horton)
4. 05:59 AM - Re: testing static system (Kelly McMullen)
5. 06:08 AM - Re: testing static system (Ralph E. Capen)
6. 06:33 AM - Re: testing static system (Bob Collins)
7. 08:55 AM - Re: testing static system (D Paul Deits)
8. 11:22 AM - Engraving clarification (Steve T)
9. 03:31 PM - Glitch that affected some customers (Steve T)
Message 1
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Subject: | Re: testing static system |
I put a test fitting in mine that I connect one of those JC Whitney brake bleeder
vacuum gizmos to.
I tape over both static fittings....
-----Original Message-----
From: thomas sargent
Sent: Jul 11, 2012 2:10 AM
Subject: RV-List: testing static system
I've read a lot about static system tests, but how do you do it exactly? I assume
I tape up one static port and then attach ... what to the other one? How
do I temporarily bond a vinyl tube to a static port with no leaks? RTV?
--
Tom Sargent, RV-6A
Message 2
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Subject: | Re: testing static system |
Tom,
The best way to test the static system is by using a small automotive hand
vacuum pump (like the ones used to test carburetors). Sears used to carry
these as well as most of the auto parts stores. The vacuum pump comes with a
variety of fittings, including a suction cup that can be put directly over
the static port. Tape the opposite side static port off first, then apply a
suction (not over 1000' indicated on the altimeter) to the other side. The
static system should be able to hold the altitude within 100' for over a
minute.
One of the problems you might run into is suction leakage from around the
static port - between the static port and the skin. I had to apply a
silicone seal on the inside of the skin to avoid this issue.
All other leaks can usually be found around other fittings within the
static system. When I can't get a leak-free system, I find that breaking the
static line such that I isolate the rear of the aircraft from the front
area, it's easier to isolate the problem to specific areas.
Fred Stucklen
RV-7A N924RV 740 Hrs Flying
RV-6A N926RV 875 Hrs sold
RV-6A N925RV 2008 Hrs Sold
Time:
11:11:58 PM PST US
Subject:
testing static system
From:
thomas sargent <sarg314@gmail.com>
I've read a lot about static system tests, but how do you do it
exactly? I
assume I tape up one static port and then attach ... what to the other
one? How do I temporarily bond a vinyl tube to a static port with no
leaks? RTV?
--
Tom Sargent, RV-6A
Message 3
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Subject: | Re: testing static system |
How do you verify that your test fitting doesn't leak when it is not in use?
Kevin Horton
On 2012-07-11, at 07:22 , Ralph E. Capen wrote:
>
> I put a test fitting in mine that I connect one of those JC Whitney brake bleeder
vacuum gizmos to.
>
> I tape over both static fittings....
>
> -----Original Message-----
> From: thomas sargent
> Sent: Jul 11, 2012 2:10 AM
> To: rv-list
> Subject: RV-List: testing static system
>
> I've read a lot about static system tests, but how do you do it exactly? I assume
I tape up one static port and then attach ... what to the other one? How
do I temporarily bond a vinyl tube to a static port with no leaks? RTV?
>
Message 4
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Subject: | Re: testing static system |
Keep several things in mind. You do not want to pull more than 1000 ft
on your altimeter. Lowering the pressure on the static side without
similar reduction to the pitot puts a pressure on the airspeed
indicator. Also, other than ensuring you have a leak free system, you
cannot certify the static system. You will need to have the system
certified if you want to fly anywhere an encoder is required, like Class
B or controlled airspace above 10,000 ft. It takes a shop with a repair
station license to certify your transponder, encoder and static system.
Doubly so if you want to fly IFR. One of those few items you can't do
for yourself on a homebuilt.
On 7/11/2012 4:40 AM, Fred Stucklen wrote:
>
> Tom,
>
> The best way to test the static system is by using a small automotive
> hand vacuum pump (like the ones used to test carburetors). Sears used
> to carry these as well as most of the auto parts stores. The vacuum
> pump comes with a variety of fittings, including a suction cup that
> can be put directly over the static port. Tape the opposite side
> static port off first, then apply a suction (not over 1000 indicated
> on the altimeter) to the other side. The static system should be able
> to hold the altitude within 100 for over a minute.
>
> One of the problems you might run into is suction leakage from around
> the static port between the static port and the skin. I had to apply
> a silicone seal on the inside of the skin to avoid this issue.
>
> All other leaks can usually be found around other fittings within the
> static system. When I cant get a leak-free system, I find that
> breaking the static line such that I isolate the rear of the aircraft
> from the front area, its easier to isolate the problem to specific areas.
>
>
-----
No virus found in this message.
Checked by AVG - www.avg.com
Message 5
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Subject: | Re: testing static system |
When I get the official check, they don't use the test port - as they have their
own procedure...I didn't know that when I put the test port in.
-----Original Message-----
>From: Kevin Horton <khorton02@gmail.com>
>Sent: Jul 11, 2012 8:51 AM
>To: rv-list@matronics.com
>Subject: Re: RV-List: testing static system
>
>
>How do you verify that your test fitting doesn't leak when it is not in use?
>
>Kevin Horton
>
>On 2012-07-11, at 07:22 , Ralph E. Capen wrote:
>
>>
>> I put a test fitting in mine that I connect one of those JC Whitney brake bleeder
vacuum gizmos to.
>>
>> I tape over both static fittings....
>>
>> -----Original Message-----
>> From: thomas sargent
>> Sent: Jul 11, 2012 2:10 AM
>> To: rv-list
>> Subject: RV-List: testing static system
>>
>> I've read a lot about static system tests, but how do you do it exactly? I
assume I tape up one static port and then attach ... what to the other one? How
do I temporarily bond a vinyl tube to a static port with no leaks? RTV?
>>
>
>
Message 6
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Subject: | testing static system |
I didn't do anything fancy.
I went to Fleet Farm (a farm supply store) and got a plastic syringe (the
package said "veterinary use only," and when the kid at the counter said
"what's this going to be used for," I said...."ummm.... Errrrr.... It's for
my dog.... And my cat (I had two sizes because I didn't know what size to
use)... They wouldn't take their pills so I've got some liquid medication. I
felt like a meth dealer).
I also bought some "medical tubing" (which made me look like a heroin
addict) and attached it to the syringe and used safety wire to secure it. I
attached the other end to a piece of the rigid plastic tubing I used in the
pitot/static system (SafeAir system). I also secured that connection with
safety wire, and removed a line from a junction and installed the tubing in
its place. Do not connect it directly to an instrument.
Image here:
http://tinyurl.com/6tjx48v
I taped over the static ports -- use electrical tape because duct tape will
not work... Too pourous.
I similarly plugged the pitot tube and applied a SMALL vacuum to 1,000 feet
and watched the instruments. I reinstalled the line I replaced and then
disconnected another location and repeated the process to check all
instruments.
I had a leak and -- as many others have found -- it was at a fitting at one
of the instruments. The other "leak" was a poor job of plugging the pitot
tube. Both were adjusted and rechecked. Zero change in "altitude."
I used 23.1325 as my guide:
(i) Unpressurized airplanes. Evacuate the static pressure system to a
pressure differential of approximately 1 inch of mercury or to a reading on
the altimeter, 1,000 feet above the aircraft elevation at the time of the
test. Without additional pumping for a period of 1 minute, the loss of
indicated altitude must not exceed 100 feet on the altimeter.
Cost: About $10 and a bad reputation at Fleet Farm.
There's another method -- a manometer -- which you can learn about here:
http://www.iflyez.com/manometer.shtml
Do not archive
Message 7
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Subject: | testing static system |
Please unsubscribe for now. Thank you very much
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Bob Collins
Sent: Wednesday, July 11, 2012 6:33 AM
Subject: RE: RV-List: testing static system
I didn't do anything fancy.
I went to Fleet Farm (a farm supply store) and got a plastic syringe (the
package said "veterinary use only," and when the kid at the counter said
"what's this going to be used for," I said...."ummm.... Errrrr.... It's for
my dog.... And my cat (I had two sizes because I didn't know what size to
use)... They wouldn't take their pills so I've got some liquid medication. I
felt like a meth dealer).
I also bought some "medical tubing" (which made me look like a heroin
addict) and attached it to the syringe and used safety wire to secure it. I
attached the other end to a piece of the rigid plastic tubing I used in the
pitot/static system (SafeAir system). I also secured that connection with
safety wire, and removed a line from a junction and installed the tubing in
its place. Do not connect it directly to an instrument.
Image here:
http://tinyurl.com/6tjx48v
I taped over the static ports -- use electrical tape because duct tape will
not work... Too pourous.
I similarly plugged the pitot tube and applied a SMALL vacuum to 1,000 feet
and watched the instruments. I reinstalled the line I replaced and then
disconnected another location and repeated the process to check all
instruments.
I had a leak and -- as many others have found -- it was at a fitting at one
of the instruments. The other "leak" was a poor job of plugging the pitot
tube. Both were adjusted and rechecked. Zero change in "altitude."
I used 23.1325 as my guide:
(i) Unpressurized airplanes. Evacuate the static pressure system to a
pressure differential of approximately 1 inch of mercury or to a reading on
the altimeter, 1,000 feet above the aircraft elevation at the time of the
test. Without additional pumping for a period of 1 minute, the loss of
indicated altitude must not exceed 100 feet on the altimeter.
Cost: About $10 and a bad reputation at Fleet Farm.
There's another method -- a manometer -- which you can learn about here:
http://www.iflyez.com/manometer.shtml
Do not archive
Message 8
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Subject: | Engraving clarification |
I have received many inquiries and I just wanted to clarify that the Usher c
aps we engrave are the standard caps that Vans uses on all their models. In
addition, we can do Andair caps and also the Newton deluxe caps that vans s
ells.
If there are any other types, we are happy to accommodate you. It may add a
few days to the turnaround as we will need to make a custom
Holder but will do this at no additional cost to our customers.
Have a great afternoon.
Hope to meet some of you at Oshkosh!
Steve
Www.aircraftspecialty.com
Www.kitplanemods.com
Www.kitplanehoses.com
Sent from my iPhone
Sent from my iPhone
Message 9
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Subject: | Glitch that affected some customers |
To those of you who placed orders for fuel cap engraving, thank you!
For those that tried and experienced a technical glitch, the problem has been resolved
and ordering is again available.
Have a great day
Steve :)
Sent from my iPhone
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