Today's Message Index:
----------------------
0. 12:28 AM - Make Sure You're Listed! List of Contributors Coming Soon! (Matt Dralle)
1. 01:28 AM - Re: Original Sight Gauge Replication (Pete Lawless)
2. 01:46 AM - Re: Original Sight Gauge Replication (Jim McAvoy)
3. 01:59 AM - Re: Original Sight Gauge Replication (Max Cointe (Free))
4. 03:01 AM - Re: Original Sight Gauge Replication (GRAHAM SINGLETON)
5. 08:00 AM - cooling duct (Alain Chabert)
6. 08:47 AM - Re: Original Sight Gauge Replication (Andrew Sarangan)
7. 09:17 AM - Re: Re: Saggy outriggers (Fred Klein)
8. 09:46 AM - Mono dolly (Mike Gamble)
9. 10:04 AM - Re: Re: Saggy outriggers (Jerry Rehn)
10. 10:21 AM - Re: Mono dolly (Fred Klein)
11. 10:31 AM - Re: Original Sight Gauge Replication (Paul McAllister)
12. 10:56 AM - Re: Mono dolly (hagargs)
13. 11:04 AM - Re: Carburettor icing Rotax 912S (John Wighton)
14. 11:30 AM - Re: Mono dolly (David Joyce)
15. 12:18 PM - Re: Original Sight Gauge Replication (Jan de Jong)
16. 04:19 PM - Re: Original Sight Gauge Replication (Andrew Sarangan)
17. 04:51 PM - Re: Original Sight Gauge Replication (Jan de Jong)
18. 07:17 PM - More Mod 78 Fun! (djaflyact)
19. 08:04 PM - Re: Original Sight Gauge Replication (Andrew Sarangan)
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Subject: | Make Sure You're Listed! List of Contributors Coming Soon! |
Dear Listers,
There's just a few more days left in this year's List Fund Raiser and that means
the List of Contributors (LOC) is just around the corner! In December I post
a list of everyone that so generously made a Contribution to support the Lists.
Its my way of publicly thanking everyone that took a minute to show their
appreciation for the Lists.
Won't you take minute and assure that your name is on the upcoming LOC? Tell others
that you appreciate the Lists. Making a Contribution to support the Lists
is fast and easy using your Visa, MasterCard, or Paypal account:
http://www.matronics.com/contribution
Or, drop a personal check in the mail to:
Matt Dralle / Matronics
581 Jeannie Way
Livermore CA 94550
I would like to thank everyone that has so generously made a Contribution thus
far during this year's List Fund Raiser! Remember that its YOUR support that
keeps these Lists running and improving! Don't forget to include a little comment
about how the Lists have helped you!
Thank you!
Matt Dralle
Matronics Email List Administrator
Message 1
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Subject: | Original Sight Gauge Replication |
Hi Tony
It would be useful to have a sight gauge that worked in the air as well.
On
AC I have a fuel computer and tank capacitance gauge but no sight gauge.
This makes me ask the question 'What would I do if one or the other
showed a
sudden loss in volume?' probably assume it was an instrument problem
rather
than a major fuel leak? Under that circumstance a third, all be it
somewhat
inaccurate, indication would be invaluable.
Regards
Pete
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Tony
Renshaw
Sent: 27 November 2013 07:37
Subject: {Spam?} Europa-List: Original Sight Gauge Replication
Gidday,
I am interested in installing a fuel sight gauge for "PRE-flight"
interpretation. I am wondering if there is any recommendation that makes
the
setup more effective or accurate. I'm also wondering if there is any
value
in having two small ball valves to be able to isolate it, both in a
rollover
or to simply turn it off. I am using flexible Aeroquip fuel hose, and
will
be using a fuel computer as my primary means of knowing my fuel state,
PLUS,
I have a Fuel tank capacitance gauge. Maybe with the capacitance I don't
need a sight gauge at all, but I have the plumbing in my fuel tank
outlet
fittings, so it seems sensible to use it. Any help much appreciated.
Regards
Tony Renshaw
Sydney Aussie
This is a picture of the small valves I "could" use, and the 1/4" ID
line I
intend to use on a sight gauge setup.
--
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Subject: | Re: Original Sight Gauge Replication |
Tony
I have the original sight gauge and would not do it again
After a few years I added a sight gauge behind the FOs seat that is used for re-fuelling,
and it is better than the original. It's calibrated for tail down and
tail up. This would serve fine for your use as a " emergency confidence" check
in flight.
It just links the reserve outlet to the very top of the tank, a closed circuit.
Don't like the fuel in the reccomended position and the requirement for pipes all
the way back to the vent.
Regards
Jim McAvoy
> On 27 Nov 2013, at 3:36 pm, Tony Renshaw <tonyrenshaw268@gmail.com> wrote:
>
> Gidday,
> I am interested in installing a fuel sight gauge for "PRE-flight" interpretation.
I am wondering if there is any recommendation that makes the setup more effective
or accurate. I'm also wondering if there is any value in having two small
ball valves to be able to isolate it, both in a rollover or to simply turn
it off. I am using flexible Aeroquip fuel hose, and will be using a fuel computer
as my primary means of knowing my fuel state, PLUS, I have a Fuel tank capacitance
gauge. Maybe with the capacitance I don't need a sight gauge at all,
but I have the plumbing in my fuel tank outlet fittings, so it seems sensible
to use it. Any help much appreciated.
> Regards
> Tony Renshaw
> Sydney Aussie
>
> This is a picture of the small valves I "could" use, and the 1/4" ID line I intend
to use on a sight gauge setup.
>
>
> <IMG_6863.jpeg>
Message 3
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Subject: | Original Sight Gauge Replication |
Tony,
I've a fuel gauge on panel but don't trust much the indication it gives so
I've reinstalled the sight gauge behind the port backrest and look at it it
after each flight to verify the quantity of fuel available - so to confirm
my estimation.
Still have in mind to install a fuel flow to replace the gauge on the
panel...
Max Cointe
mcointe@free.fr
F-PMLH Europa XS_TriGear
Kit #560-2003 912ULS/AirmasterAP332 490 hours
F-PLDJ DynAro MCR 4S
Kit #27-2002 912ULSFR/MTProp MTV7A 1600 heures
-----Message d'origine-----
De: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] De la part de Jim McAvoy
Envoy: mercredi 27 novembre 2013 10:46
: europa-list@matronics.com
Objet: Re: Europa-List: Original Sight Gauge Replication
Tony
I have the original sight gauge and would not do it again After a few years
I added a sight gauge behind the FOs seat that is used for re-fuelling, and
it is better than the original. It's calibrated for tail down and tail up.
This would serve fine for your use as a " emergency confidence" check in
flight.
It just links the reserve outlet to the very top of the tank, a closed
circuit.
Don't like the fuel in the reccomended position and the requirement for
pipes all the way back to the vent.
Regards
Jim McAvoy
> On 27 Nov 2013, at 3:36 pm, Tony Renshaw <tonyrenshaw268@gmail.com> wrote:
>
> Gidday,
> I am interested in installing a fuel sight gauge for "PRE-flight"
interpretation. I am wondering if there is any recommendation that makes the
setup more effective or accurate. I'm also wondering if there is any value
in having two small ball valves to be able to isolate it, both in a rollover
or to simply turn it off. I am using flexible Aeroquip fuel hose, and will
be using a fuel computer as my primary means of knowing my fuel state, PLUS,
I have a Fuel tank capacitance gauge. Maybe with the capacitance I don't
need a sight gauge at all, but I have the plumbing in my fuel tank outlet
fittings, so it seems sensible to use it. Any help much appreciated.
> Regards
> Tony Renshaw
> Sydney Aussie
>
> This is a picture of the small valves I "could" use, and the 1/4" ID line
I intend to use on a sight gauge setup.
>
>
> <IMG_6863.jpeg>
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Subject: | Re: Original Sight Gauge Replication |
Tony=0Ahave a look at this, works reliably. The large breather pipe helps f
illing too, the air can get out easier=0Aunlike the standard 1/4" pipe whic
h causes fuel to splutter out of the filler.=0AGraham=0A=0A=0A=0A__________
______________________=0A From: Tony Renshaw <tonyrenshaw268@gmail.com>=0A
=0A =0A=0A=0AGidday,=0AI am interested in installing a fuel sight gauge for
"PRE-flight" interpretation. I am wondering if there is any recommendation
that makes the setup more effective or accurate. I'm also wondering if the
re is any value in having two small ball valves to be able to isolate it, b
oth in a rollover or to simply turn it off. I am using flexible Aeroquip fu
el hose, and will be using a fuel computer as my primary means of knowing m
y fuel state, PLUS, I have a Fuel tank capacitance gauge. Maybe with the ca
pacitance I don't need a sight gauge at all, but I have the plumbing in my
fuel tank outlet fittings, so it seems sensible to use it. -Any help much
appreciated.-=0ARegards=0ATony Renshaw=0ASydney Aussie=0A=0AThis is a pi
cture of the small valves I "could" use, and the 1/4" ID line I intend to u
se on a sight gauge setup.-
Message 5
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Hello,
Does anyone have plans with the quotations of elements that make up the
radiator support (CD1, CD2...CD5) for Europa XS cooling duct.
Regards
--
*Alain CHABERT
Europa F-PSLY N275*
__
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Subject: | Re: Original Sight Gauge Replication |
Some time back there was a discussion of using a pressure transducer on the
tank outlet fitting for sensing the hydrostatic pressure, which can then be
calibrated for fuel volume. This is what I plan on doing. In order to work
properly, the tank vent line has to be connected to the other side of the
transducer so it can get the correct differential pressure. I believe Paul
McAllister did something similar to this.
On Wed, Nov 27, 2013 at 6:00 AM, GRAHAM SINGLETON <
grahamsingleton@btinternet.com> wrote:
> Tony
> have a look at this, works reliably. The large breather pipe helps filling
> too, the air can get out easier
> unlike the standard 1/4" pipe which causes fuel to splutter out of the
> filler.
> Graham
>
> ------------------------------
> *From:* Tony Renshaw <tonyrenshaw268@gmail.com>
>
>
> Gidday,
> I am interested in installing a fuel sight gauge for "PRE-flight"
> interpretation. I am wondering if there is any recommendation that makes
> the setup more effective or accurate. I'm also wondering if there is any
> value in having two small ball valves to be able to isolate it, both in a
> rollover or to simply turn it off. I am using flexible Aeroquip fuel hose,
> and will be using a fuel computer as my primary means of knowing my fuel
> state, PLUS, I have a Fuel tank capacitance gauge. Maybe with the
> capacitance I don't need a sight gauge at all, but I have the plumbing in
> my fuel tank outlet fittings, so it seems sensible to use it. Any help
> much appreciated.
> Regards
> Tony Renshaw
> Sydney Aussie
>
> This is a picture of the small valves I "could" use, and the 1/4" ID line
> I intend to use on a sight gauge setup.
>
>
Message 7
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Subject: | Re: Saggy outriggers |
On Nov 26, 2013, at 8:26 PM, Martin Tuck wrote:
>
> Hi Fred,
>
> How much are you asking for the eccentric OR10s?
Martin,
I've been assured, now that there's a program stored in the CNC machine,
that the costs for additional pieces will be nominal.
I've just now emailed the guy asking for confirmation of cost and
minimal quantities for additional pieces...I'll let you know just as
soon as I find out.
Fred
PS: BTW, I often go to your YouTube video when I need a bit of
inspiration to complete my build.
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I seem to recollect a posting showing suggestions for a dolly which would
hold a mono upright whilst de-rigging and then allow movement of the a/c.
I am considering moving the ship into the garage for the bad weather months
this winter. This will only be possible off the trailer and minus the prop
and the rudder.
Simple suggestions will be most welcome.
Mike Gamble
XS mono G-CFMP
Message 9
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Subject: | Re: Saggy outriggers |
Fred
I've had saggy outriggers for 13 years! Guess I need to get on your list!
I can pick mine up:)
Thanks
Regards
Jerry
Sent from my iPad
On Nov 27, 2013, at 10:16 AM, Fred Klein <fklein@orcasonline.com> wrote:
>
> On Nov 26, 2013, at 8:26 PM, Martin Tuck wrote:
>
>>
>> Hi Fred,
>>
>> How much are you asking for the eccentric OR10s?
>
> Martin,
>
> I've been assured, now that there's a program stored in the CNC machine, t
hat the costs for additional pieces will be nominal.
>
> I've just now emailed the guy asking for confirmation of cost and minimal q
uantities for additional pieces...I'll let you know just as soon as I find o
ut.
>
> Fred
>
> PS: BTW, I often go to your YouTube video when I need a bit of inspiration
to complete my build.
>
>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
Message 10
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On Nov 27, 2013, at 9:45 AM, Mike Gamble wrote:
> I seem to recollect a posting showing suggestions for a dolly which
would hold a mono upright whilst de-rigging and then allow movement of
the a/c.
>
Mike...Steve Hagar designed a beaut...I suspect he would send you some
CAD dwgs for dimensions etc. as he did for me.
Fred
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Subject: | Re: Original Sight Gauge Replication |
Hello everyone,
I have been using this in my aircraft since 2004. Tony K did the original
design work and it is based on a PIC micro processor. It is calibrated in
1/10th increments from empty to full and displays on a 10 segment LED or an
analogue display.
There isn't any PCB design and most people who have built them seemed to
have trouble in getting them up an running. It's not complex to build but
they do require a bit of tinkering to get them working, installed and
calibrated. In my case I set up a water manometer on my bench to get it
debugged and working.
The only issue I have had is that despite having a static vent on the
differential side, the gauge does read high when climbing and low when
descending and it takes a few minutes to stabilize in these scenarios. It
hasn't been enough of a problem for me to bother with trying to fix it.
Other than this it has functioned reliably for the last 9 years.
I use this in conjunction with my fuel totalizer and I do not have a sight
gauge.
I do have the source code so I could burn some PIC's for people, but before
doing this I will need Tony K's permission. I guess if there was enough
interest I could create a PCB design and build a batch of them. I will
need to think on this some more before I sign up for this. :)
Regards, Paul
Message 12
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Here is a video overview of the unit I made
http://www.youtube.com/watch?v=BHYtCRwemiA
Steve Hagar
A143 Mesa AZ
-----Original Message-----
>From: Mike Gamble <mp.gamble@talktalk.net>
>Sent: Nov 27, 2013 10:45 AM
>To: europa-list@matronics.com
>Subject: Europa-List: Mono dolly
>
>I seem to recollect a posting showing suggestions for a dolly which would
>hold a mono upright whilst de-rigging and then allow movement of the a/c.
>
>I am considering moving the ship into the garage for the bad weather months
>this winter. This will only be possible off the trailer and minus the prop
>and the rudder.
>
>Simple suggestions will be most welcome.
>
>Mike Gamble
>
>XS mono G-CFMP
>
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Subject: | Re: Carburettor icing Rotax 912S |
Jonathan,
Just fit the standard heaters and enjoy your flying without worrying about icing.
One of many joys in flying the Europa is that you dont have to worry about
icing (or mixture or cowl flaps or how much fuel you are using, etc) so l would
think it is a no brainer.
Perhaps consider a full firewall fwd installation?
Regards
John
--------
John Wighton
Europa XS trigear G-IPOD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=414355#414355
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Mike, I have a great dolly which was manufactured by Roger
Targett, which holds my plane perfectly for rigging and
being height adjustable, it also allows the U/C to be
raised & lowered for work on Tyres, Brakes & wheel arch.
It depends on a strong fibreglass splash moulding of the
lower fuselage from the firewall back a couple of feet
with a cut out for the U/C, which is lined with soft
material for the fus to sit in, and it is through bolted
to the fuselage to nuts bonded into the hull. The whole
thing fixes into the covered trailer for transport. I will
send you pictures in the next 2/7. Roger did this as a one
off but it would be within the competence of many,
possibly most builders to make something similar.
Regards, David Joyce, G-XSDJ
On Wed, 27 Nov 2013 17:45:34 -0000
"Mike Gamble" <mp.gamble@talktalk.net> wrote:
> I seem to recollect a posting showing suggestions for a
>dolly which would
> hold a mono upright whilst de-rigging and then allow
>movement of the a/c.
>
> I am considering moving the ship into the garage for
>the bad weather months
> this winter. This will only be possible off the trailer
>and minus the prop
> and the rudder.
>
> Simple suggestions will be most welcome.
>
> Mike Gamble
>
> XS mono G-CFMP
>
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Subject: | Re: Original Sight Gauge Replication |
What has always puzzled me.
According to the specifications of the sensor the uncertainty in the
initial zero offset is +/- about 25 % of our full scale of 0.5 psi (35
cm of water). Which in the general case would require a generous bias
(using an opamp) to the output of the instrumentation amplifier.
Ofcourse, maybe Honeywell is way too pessimistic in its specification.
Tony K must have decided so?
Jan de Jong
On 11/27/2013 7:30 PM, Paul McAllister wrote:
> Hello everyone,
>
> I have been using this in my aircraft since 2004. Tony K did the
> original design work and it is based on a PIC micro processor. It is
> calibrated in 1/10th increments from empty to full and displays on a
> 10 segment LED or an analogue display.
>
> There isn't any PCB design and most people who have built them seemed
> to have trouble in getting them up an running. It's not complex to
> build but they do require a bit of tinkering to get them working,
> installed and calibrated. In my case I set up a water manometer on my
> bench to get it debugged and working.
>
> The only issue I have had is that despite having a static vent on the
> differential side, the gauge does read high when climbing and low when
> descending and it takes a few minutes to stabilize in these scenarios.
> It hasn't been enough of a problem for me to bother with trying to fix
> it. Other than this it has functioned reliably for the last 9 years.
>
> I use this in conjunction with my fuel totalizer and I do not have a
> sight gauge.
>
> I do have the source code so I could burn some PIC's for people, but
> before doing this I will need Tony K's permission. I guess if there
> was enough interest I could create a PCB design and build a batch of
> them. I will need to think on this some more before I sign up for
> this. :)
>
> Regards, Paul
>
Message 16
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Subject: | Re: Original Sight Gauge Replication |
I don't remember which chip TonyK used originally, but there are MEMS
based membrane pressure sensors out there with 0.5 psi full scale (or
even smaller scales). I plan to do this with a Atmel controller, and
when I get around to it, I will post it here for everyone's benefit.
Here is one: http://www.mouser.com/ProductDetail/Silicon-Microstructures-Inc/SM5852-003-G-3-NR/?qs=sGAEpiMZZMvhQj7WZhFIAE1JN4kSCAy2w%2fQb30WxsAg%3d
On Wed, Nov 27, 2013 at 3:17 PM, Jan de Jong <jan_de_jong@casema.nl> wrote:
>
>
> What has always puzzled me.
> According to the specifications of the sensor the uncertainty in the initial
> zero offset is +/- about 25 % of our full scale of 0.5 psi (35 cm of water).
> Which in the general case would require a generous bias (using an opamp) to
> the output of the instrumentation amplifier. Ofcourse, maybe Honeywell is
> way too pessimistic in its specification. Tony K must have decided so?
>
> Jan de Jong
>
>
> On 11/27/2013 7:30 PM, Paul McAllister wrote:
>>
>> Hello everyone,
>>
>> I have been using this in my aircraft since 2004. Tony K did the original
>> design work and it is based on a PIC micro processor. It is calibrated in
>> 1/10th increments from empty to full and displays on a 10 segment LED or an
>> analogue display.
>>
>> There isn't any PCB design and most people who have built them seemed to
>> have trouble in getting them up an running. It's not complex to build but
>> they do require a bit of tinkering to get them working, installed and
>> calibrated. In my case I set up a water manometer on my bench to get it
>> debugged and working.
>>
>> The only issue I have had is that despite having a static vent on the
>> differential side, the gauge does read high when climbing and low when
>> descending and it takes a few minutes to stabilize in these scenarios. It
>> hasn't been enough of a problem for me to bother with trying to fix it.
>> Other than this it has functioned reliably for the last 9 years.
>>
>> I use this in conjunction with my fuel totalizer and I do not have a sight
>> gauge.
>>
>> I do have the source code so I could burn some PIC's for people, but
>> before doing this I will need Tony K's permission. I guess if there was
>> enough interest I could create a PCB design and build a batch of them. I
>> will need to think on this some more before I sign up for this. :)
>>
>> Regards, Paul
>>
>
>
Message 17
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Subject: | Re: Original Sight Gauge Replication |
Tony K used the original large version of 26PC01??? , now available as
26PC01SMT at both Mouser and Digikey.
Two important properties:
- temperature compensation for the range 0 to 50 degrees C
- fuel compatible (fluorosilicone seal I believe)
On 11/28/2013 1:18 AM, Andrew Sarangan wrote:
>
> I don't remember which chip TonyK used originally, but there are MEMS
> based membrane pressure sensors out there with 0.5 psi full scale (or
> even smaller scales). I plan to do this with a Atmel controller, and
> when I get around to it, I will post it here for everyone's benefit.
>
> Here is one: http://www.mouser.com/ProductDetail/Silicon-Microstructures-Inc/SM5852-003-G-3-NR/?qs=sGAEpiMZZMvhQj7WZhFIAE1JN4kSCAy2w%2fQb30WxsAg%3d
>
>
> On Wed, Nov 27, 2013 at 3:17 PM, Jan de Jong <jan_de_jong@casema.nl> wrote:
>>
>>
>> What has always puzzled me.
>> According to the specifications of the sensor the uncertainty in the initial
>> zero offset is +/- about 25 % of our full scale of 0.5 psi (35 cm of water).
>> Which in the general case would require a generous bias (using an opamp) to
>> the output of the instrumentation amplifier. Ofcourse, maybe Honeywell is
>> way too pessimistic in its specification. Tony K must have decided so?
>>
>> Jan de Jong
>>
>>
>> On 11/27/2013 7:30 PM, Paul McAllister wrote:
>>> Hello everyone,
>>>
>>> I have been using this in my aircraft since 2004. Tony K did the original
>>> design work and it is based on a PIC micro processor. It is calibrated in
>>> 1/10th increments from empty to full and displays on a 10 segment LED or an
>>> analogue display.
>>>
>>> There isn't any PCB design and most people who have built them seemed to
>>> have trouble in getting them up an running. It's not complex to build but
>>> they do require a bit of tinkering to get them working, installed and
>>> calibrated. In my case I set up a water manometer on my bench to get it
>>> debugged and working.
>>>
>>> The only issue I have had is that despite having a static vent on the
>>> differential side, the gauge does read high when climbing and low when
>>> descending and it takes a few minutes to stabilize in these scenarios. It
>>> hasn't been enough of a problem for me to bother with trying to fix it.
>>> Other than this it has functioned reliably for the last 9 years.
>>>
>>> I use this in conjunction with my fuel totalizer and I do not have a sight
>>> gauge.
>>>
>>> I do have the source code so I could burn some PIC's for people, but
>>> before doing this I will need Tony K's permission. I guess if there was
>>> enough interest I could create a PCB design and build a batch of them. I
>>> will need to think on this some more before I sign up for this. :)
>>>
>>> Regards, Paul
>>>
>>
>>
>>
>>
>
>
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Subject: | More Mod 78 Fun! |
Today, I have determined that the next wing to go into the fuselage will not work.
I made a board the right thickness and did a trial run. It looked like it
it wasn't going to fit and the board verified. The problem is the aileron control
arm bolts (CS08). It looks like it might clear the CS08 arm, but not the bolt
heads.
There are some possibilities to address this new problem. Replace the AN bolts
with counter sunk screws. That might not be enough and the CS08 bracket might
be too close to the spar.
How about bending (adjusting) the CS08 bracket? The starboard CS08 has plenty of
clearance and could be bent forward to allow more clearance of the cross link
with the fuel tank. The port S08 could be bent toward the rear to allow more
clearance to the new spar. It has plenty of clearance with the fuel tank.
Anybody know if the CS08 arms can be removed? That would make modifying them easier.
Any ideas for tweaking them in place?
As Rozanna Rozanna Danna used to say - "If its not one thing, its something else!"
Thanks,
Dave
A227
Mini U2
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=414373#414373
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Subject: | Re: Original Sight Gauge Replication |
A simpler approach would be to directly connect one of these
differential sensors to a programmable panel meter, like this one:
http://www.jameco.com/Jameco/workshop/ProductNews/panelmeters.html
Then you wouldn't have to build any circuits or boards.
On Wed, Nov 27, 2013 at 7:51 PM, Jan de Jong <jan_de_jong@casema.nl> wrote:
>
> Tony K used the original large version of 26PC01??? , now available as
> 26PC01SMT at both Mouser and Digikey.
> Two important properties:
> - temperature compensation for the range 0 to 50 degrees C
> - fuel compatible (fluorosilicone seal I believe)
>
> On 11/28/2013 1:18 AM, Andrew Sarangan wrote:
>>
>>
>>
>> I don't remember which chip TonyK used originally, but there are MEMS
>> based membrane pressure sensors out there with 0.5 psi full scale (or
>> even smaller scales). I plan to do this with a Atmel controller, and
>> when I get around to it, I will post it here for everyone's benefit.
>>
>> Here is one:
>> http://www.mouser.com/ProductDetail/Silicon-Microstructures-Inc/SM5852-003-G-3-NR/?qs=sGAEpiMZZMvhQj7WZhFIAE1JN4kSCAy2w%2fQb30WxsAg%3d
>>
>>
>> On Wed, Nov 27, 2013 at 3:17 PM, Jan de Jong <jan_de_jong@casema.nl>
>> wrote:
>>>
>>>
>>>
>>> What has always puzzled me.
>>> According to the specifications of the sensor the uncertainty in the
>>> initial
>>> zero offset is +/- about 25 % of our full scale of 0.5 psi (35 cm of
>>> water).
>>> Which in the general case would require a generous bias (using an opamp)
>>> to
>>> the output of the instrumentation amplifier. Ofcourse, maybe Honeywell is
>>> way too pessimistic in its specification. Tony K must have decided so?
>>>
>>> Jan de Jong
>>>
>>>
>>> On 11/27/2013 7:30 PM, Paul McAllister wrote:
>>>>
>>>> Hello everyone,
>>>>
>>>> I have been using this in my aircraft since 2004. Tony K did the
>>>> original
>>>> design work and it is based on a PIC micro processor. It is calibrated
>>>> in
>>>> 1/10th increments from empty to full and displays on a 10 segment LED or
>>>> an
>>>> analogue display.
>>>>
>>>> There isn't any PCB design and most people who have built them seemed to
>>>> have trouble in getting them up an running. It's not complex to build
>>>> but
>>>> they do require a bit of tinkering to get them working, installed and
>>>> calibrated. In my case I set up a water manometer on my bench to get it
>>>> debugged and working.
>>>>
>>>> The only issue I have had is that despite having a static vent on the
>>>> differential side, the gauge does read high when climbing and low when
>>>> descending and it takes a few minutes to stabilize in these scenarios.
>>>> It
>>>> hasn't been enough of a problem for me to bother with trying to fix it.
>>>> Other than this it has functioned reliably for the last 9 years.
>>>>
>>>> I use this in conjunction with my fuel totalizer and I do not have a
>>>> sight
>>>> gauge.
>>>>
>>>> I do have the source code so I could burn some PIC's for people, but
>>>> before doing this I will need Tony K's permission. I guess if there was
>>>> enough interest I could create a PCB design and build a batch of them.
>>>> I
>>>> will need to think on this some more before I sign up for this. :)
>>>>
>>>> Regards, Paul
>>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>
>
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