Today's Message Index:
----------------------
1. 04:25 AM - Re: Z-13/8 Questions (MMiller)
2. 04:26 AM - Electric Fuel Pressure Gauge (Ed Leineweber)
3. 05:47 AM - Re: Electric Fuel Pressure Gauge (Charlie England)
4. 08:17 AM - Re: Electric Fuel Pressure Gauge (Robert L. Nuckolls, III)
5. 08:37 AM - Short DB-9 shell? (Art Zemon)
6. 09:00 AM - Re: Short DB-9 shell? (Daniel Hooper)
7. 09:29 AM - Re: Short DB-9 shell? (Eric Page)
8. 09:36 AM - Re: Short DB-9 shell? (Bill Putney)
9. 10:47 AM - Re: Short DB-9 shell? (Art Zemon)
10. 05:40 PM - Silent-Hektik Regulator (Ken Ryan)
11. 06:12 PM - Re: Electric Fuel Pressure Gauge (Ed Leineweber)
Message 1
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Subject: | Re: Z-13/8 Questions |
Charlie, Yes I agree with you, that was my first thought also. But the more I looked
at these, the more my option evolved. I lean towards vibration on this version
for several reasons;
1). Sample 1of the post 2010 version photos had many failed solder joints but the
ultimate failure was lead stress that sheared the gate pin at the body of the
SCR. The same logic would suggest " how can this happen in a potted device."
2). This failure mode is nonexistent on the older versions without the gel type
potting compound.
3). These don't fail out of the box, they run about 125 hours before failure...on
average for these samples.
ceengland7(at)gmail.com wrote:
>
> ...The post-2010 failure pics all look like what electronics techs call 'cold
solder joints'. ...
> ...
> I have no reason to doubt your word that the components can move if
> embedded in 'soft' potting compound, but.... in my opinion, a properly
> soldered joint on a pc board pad like that would not fail due to
> vibration. The pad/trace would peal up from the substrate, or the lead
> would break, before the solder joint to the lead would fail. Properly
> executed solder joints are much stronger than most people think.
>
> Charlie
>
>
>
>
>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=458033#458033
Message 2
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Subject: | Electric Fuel Pressure Gauge |
How does an electric fuel pressure gauge work? Specifically, what power
supply must be provided? What amperage?
I am installing a Holly brand fuel pressure gauge on the fuel pressure
regulator servicing the Bing 94 carburetor on my Rotec R2800 radial engine.
The installation will be temporary during the Phase 1 flight test period.
My idea is to power the gauge via the 12V accessory (cigarette lighter)
outlet. Should this be an adequate power supply?
Thanks.
Ed Leineweber
Message 3
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Subject: | Re: Electric Fuel Pressure Gauge |
On Sun, Jul 10, 2016 at 6:24 AM, Ed Leineweber <edleine61@gmail.com> wrote:
> How does an electric fuel pressure gauge work? Specifically, what power
> supply must be provided? What amperage?
>
>
> I am installing a Holly brand fuel pressure gauge on the fuel pressure
> regulator servicing the Bing 94 carburetor on my Rotec R2800 radial
> engine. The installation will be temporary during the Phase 1 flight test
> period. My idea is to power the gauge via the 12V accessory (cigarette
> lighter) outlet. Should this be an adequate power supply?
>
>
> Thanks.
>
>
> Ed Leineweber
>
What does the installation guide for the gauge say? If it's a typical
off-the-shelf gauge that's sold for installation in cars, then 12V supply
would be likely. Current consumption should be insignificant; milliamps
rather than amps.
Older 'can type' sensors work by pressure moving a diaphragm, which moves
the 'wiper' of what amounts to a volume control, varying the voltage to the
meter. Newer solid state sensors with 3 wires use a 'strain gauge' in the
case. A lot of the solid state sensors expect to be supplied with 5V, but a
dedicated gauge would likely supply the reduced voltage to the sensor.
Charlie
Message 4
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Subject: | Re: Electric Fuel Pressure Gauge |
At 07:46 AM 7/10/2016, you wrote:
>On Sun, Jul 10, 2016 at 6:24 AM, Ed Leineweber
><<mailto:edleine61@gmail.com>edleine61@gmail.com> wrote:
>
>How does an electric fuel pressure gauge
>work?=C2 Specifically, what power supply must be provided? What amperage?
>
>=C2
>
>I am installing a Holly brand fuel pressure
>gauge on the fuel pressure regulator servicing
>the Bing 94 carburetor on my Rotec R2800 radial
>engine.=C2 The installation will be temporary
>during the Phase 1 flight test period.=C2 My idea
>is to power the gauge via the 12V accessory
>(cigarette lighter) outlet. Should this be an adequate power supply?
I believe the vast majority of OEM and after market automotive
instruments are of the 'moving magnet' variety. A
magnet is mounted to a shaft such that it lies within
the effects of two stationary, electromagnets. Energizing
electromagnet 1 moves a pointer to one end of the
scale, energizing EM2 moves it toward the other end
of the scale.
Emacs!
The position of the pointer is the vector sum of the
fields generated by the two electromagnets. Hence,
the pointer depicts some ratio of the two energizing
currents. The cool thing about this technique is
simplicity of manufacture. The pointer doesn't need
to have return springs. The magnet can be immersed in
a damping fluid that causes it to integrate small
fluctuations in the measured current thus giving
a steady reading when the signal (like fuel sloshing
in a tank) is wiggly. The positioning forces are
large meaning that the pointer shaft need not
be supported on low-friction bearings . . . often
simply stuck through a hole in sheet metal or
plastic.
http://tinyurl.com/zlsovbe
I've just installed a new 'sender' in my truck to
replace one that blew a gasket and was leaking oil
under 40psi pressure! The sender's specs call for
a resistance of 10-180 ohms resistance over a 0 to
150 psi stimulus.
http://tinyurl.com/jqh4umt
This means that the instrument reading this variable
resistance is designed to indicate 0 psi when current
thru 10 ohms is impressed on the left-most coil and
allowing the pointer to move toward the right-most
coil as the resistance goes up to 180 ohms with
increasing pressure. My new sender isn't the stock
GMC part, so the instrument that came with the sender
will have to be installed also.
The instructions with this, and most after-market
instruments will show three terminals on the
back . . . one of which goes to 14v bus, one to
ground, the other to the 'sender' which is grounded
through its fitting to engine's crankcase.
These two-coil instruments are generally limited to a
small stroke scale . . . on the order of 90 degrees
maximum and their accuracy is generally on the order
of 5 to 10 percent of reading. Multi coil insturments
can offer longer arcs . . . like speedometers. Further,
when driven by software in ECUs, they can be much more
accurate . . . perhaps 1-2 percent.
In the case of the oil pressure instrument, the 'sender'
(transducer) and instrument must be matched to each
other. They consume very lo currents from the bus . . .
on the order of 50 milliamps.
Bob . . .
Message 5
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Subject: | Short DB-9 shell? |
Folks,
Is there such a thing as a short DB-9 shell? The wire from this box is
shoved up against the spar, as you can see in this photo
https://goo.gl/photos/4K1n8VVHZKYNhioj6
If so, where would I get one?
If not, what would you think of installing the connector without the shell
but putting a cushion clamp near the box to provide strain relief?
Thanks,
-- Art Z.
--
http://CheerfulCurmudgeon.com/ <http://cheerfulcurmudgeon.com/>
*"If I am not for myself, who is for me? And if I am only for myself, what
am I? And if not now, when?" Hillel*
Message 6
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Subject: | Re: Short DB-9 shell? |
Maybe something like this will work for you, a side-entry DB9 backshell:
Mouser Part #:
706-165X10439XE
Manufacturer Part #:
165X10439XE
> On Jul 10, 2016, at 10:35 AM, Art Zemon <art@zemon.name> wrote:
>
> Folks,
>
> Is there such a thing as a short DB-9 shell? The wire from this box is shoved
up against the spar, as you can see in this photo https://goo.gl/photos/4K1n8VVHZKYNhioj6
>
> If so, where would I get one?
>
> If not, what would you think of installing the connector without the shell but
putting a cushion clamp near the box to provide strain relief?
>
> Thanks,
> -- Art Z.
>
> --
> http://CheerfulCurmudgeon.com/
>
> "If I am not for myself, who is for me? And if I am only for myself, what am
I? And if not now, when?" Hillel
Message 7
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Subject: | Re: Short DB-9 shell? |
He is a link to Digi-Key's in-stock inventory of DB-9 backshells:
http://tinyurl.com/jzxpt6z
If you see one that looks short enough, just click the PDF icon in the left c
olumn to view the datasheet, which should contain a drawing with dimensions.
Eric
> On Jul 10, 2016, at 11:35 AM, Art Zemon <art@zemon.name> wrote:
> Folks,
>
> Is there such a thing as a short DB-9 shell? The wire from this box is sho
ved up against the spar, as you can see in this photo https://goo.gl/photos/
4K1n8VVHZKYNhioj6
>
> If so, where would I get one?
>
> If not, what would you think of installing the connector without the shell
but putting a cushion clamp near the box to provide strain relief?
>
> Thanks,
> -- Art Z.
>
> --
> http://CheerfulCurmudgeon.com/
>
> "If I am not for myself, who is for me? And if I am only for myself, what a
m I? And if not now, when?" Hillel
Message 8
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Subject: | Re: Short DB-9 shell? |
Digikey has a lot of 90 exit DB9 shells. Shield and non-shielded,
plastic and metal, one piece and two piece.
http://www.digikey.com/product-detail/en/norcomp-inc/981-009-130R121/981-09RCE-ND/1632178
Bill Putney - WB6RFW
Chief Engineer
KPTZ - Port Townsend, WA
PP-SEL/A&P-IA
"...you know me to be a very smart man. Don't you think if I were wrong, I'd know
it?" -Sheldon Cooper
On 7/10/16 8:35 AM, Art Zemon wrote:
> Folks,
>
> Is there such a thing as a short DB-9 shell? The wire from this box is
> shoved up against the spar, as you can see in this photo
> https://goo.gl/photos/4K1n8VVHZKYNhioj6
>
> If so, where would I get one?
>
> If not, what would you think of installing the connector without the
> shell but putting a cushion clamp near the box to provide strain relief?
>
> Thanks,
> -- Art Z.
>
> --
> http://CheerfulCurmudgeon.com/ <http://cheerfulcurmudgeon.com/>
>
> /"If I am not for myself, who is for me? And if I am only for myself,
> what am I? And if not now, when?" Hillel/
Message 9
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Subject: | Re: Short DB-9 shell? |
Excellent! Thank you Daniel and Bill. Now that I know what it's called and
where to shop, I can buy something that will work.
-- Art Z.
On Sun, Jul 10, 2016 at 11:34 AM, Bill Putney <billp@wwpc.com> wrote:
> Digikey has a lot of 90=C2=B0 exit DB9 shells. Shield and non-shielded, p
lastic
> and metal, one piece and two piece.
>
>
> <http://www.digikey.com/product-detail/en/norcomp-inc/981-009-130R121/981
-09RCE-ND/1632178>
> http://www.digikey.com/product-detail/en/norcomp-inc/981-009-130R121/981-
09RCE-ND/1632178
>
> Bill Putney - WB6RFW
> Chief Engineer
> KPTZ - Port Townsend, WA
>
> PP-SEL/A&P-IA
>
> "...you know me to be a very smart man. Don't you think if I were wrong,
I'd know it?" -Sheldon Cooper
>
>
> On 7/10/16 8:35 AM, Art Zemon wrote:
>
> Folks,
>
> Is there such a thing as a short DB-9 shell? The wire from this box is
> shoved up against the spar, as you can see in this photo
> https://goo.gl/photos/4K1n8VVHZKYNhioj6
>
> If so, where would I get one?
>
> If not, what would you think of installing the connector without the shel
l
> but putting a cushion clamp near the box to provide strain relief?
>
> Thanks,
> -- Art Z.
>
> --
> http://CheerfulCurmudgeon.com/ <http://cheerfulcurmudgeon.com/>
>
> *"If I am not for myself, who is for me? And if I am only for myself, wha
t
> am I? And if not now, when?" Hillel*
>
>
--
http://CheerfulCurmudgeon.com/ <http://cheerfulcurmudgeon.com/>
*"If I am not for myself, who is for me? And if I am only for myself, what
am I? And if not now, when?" Hillel*
Message 10
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Subject: | Silent-Hektik Regulator |
Okay, so I've decided I will take Bob's advice and not use the Ducati
regulator and instead use the Silent-Hektik. I have a German connection
that should be able to get one for me.
There are (at least) two questions that I need answered to complete my
wiring diagram for starting/charging/fuel pumps.
1. Does the Silent-Hektik need to be disconnected from the battery when the
engine is not running, like the Ducati does (to keep from running down the
battery).
2. Is there a prohibition (again, like the Ducati) against disconnecting
the sensing wire from the bus while the engine is running?
I have not been able to find any specific information on this regulator,
other than its amp rating and its dimensions. Any help would be appreciated.
Ken Ryan
Message 11
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Subject: | Electric Fuel Pressure Gauge |
Thanks for the help. It turns out to have been a grounding issue. The
information in your post lead me to the answer.
Thanks again.
Ed Leineweber
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L.
Nuckolls, III
Sent: Sunday, July 10, 2016 10:16 AM
Subject: Re: AeroElectric-List: Electric Fuel Pressure Gauge
At 07:46 AM 7/10/2016, you wrote:
On Sun, Jul 10, 2016 at 6:24 AM, Ed Leineweber <edleine61@gmail.com
<mailto:edleine61@gmail.com> > wrote:
How does an electric fuel pressure gauge work?=C2 Specifically, what
power
supply must be provided? What amperage?
=C2
I am installing a Holly brand fuel pressure gauge on the fuel pressure
regulator servicing the Bing 94 carburetor on my Rotec R2800 radial
engine.=C2
The installation will be temporary during the Phase 1 flight test
period.=C2
My idea is to power the gauge via the 12V accessory (cigarette lighter)
outlet. Should this be an adequate power supply?
I believe the vast majority of OEM and after market automotive
instruments are of the 'moving magnet' variety. A
magnet is mounted to a shaft such that it lies within
the effects of two stationary, electromagnets. Energizing
electromagnet 1 moves a pointer to one end of the
scale, energizing EM2 moves it toward the other end
of the scale.
The position of the pointer is the vector sum of the
fields generated by the two electromagnets. Hence,
the pointer depicts some ratio of the two energizing
currents. The cool thing about this technique is
simplicity of manufacture. The pointer doesn't need
to have return springs. The magnet can be immersed in
a damping fluid that causes it to integrate small
fluctuations in the measured current thus giving
a steady reading when the signal (like fuel sloshing
in a tank) is wiggly. The positioning forces are
large meaning that the pointer shaft need not
be supported on low-friction bearings . . . often
simply stuck through a hole in sheet metal or
plastic.
http://tinyurl.com/zlsovbe
I've just installed a new 'sender' in my truck to
replace one that blew a gasket and was leaking oil
under 40psi pressure! The sender's specs call for
a resistance of 10-180 ohms resistance over a 0 to
150 psi stimulus.
http://tinyurl.com/jqh4umt
This means that the instrument reading this variable
resistance is designed to indicate 0 psi when current
thru 10 ohms is impressed on the left-most coil and
allowing the pointer to move toward the right-most
coil as the resistance goes up to 180 ohms with
increasing pressure. My new sender isn't the stock
GMC part, so the instrument that came with the sender
will have to be installed also.
The instructions with this, and most after-market
instruments will show three terminals on the
back . . . one of which goes to 14v bus, one to
ground, the other to the 'sender' which is grounded
through its fitting to engine's crankcase.
These two-coil instruments are generally limited to a
small stroke scale . . . on the order of 90 degrees
maximum and their accuracy is generally on the order
of 5 to 10 percent of reading. Multi coil insturments
can offer longer arcs . . . like speedometers. Further,
when driven by software in ECUs, they can be much more
accurate . . . perhaps 1-2 percent.
In the case of the oil pressure instrument, the 'sender'
(transducer) and instrument must be matched to each
other. They consume very lo currents from the bus . . .
on the order of 50 milliamps.
Bob . . .
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