Today's Message Index:
----------------------
1. 12:17 AM - Re: GPI bladder fuel tanks (Jan Mevis)
2. 07:00 AM - Re: GPI bladder fuel tanks (tjyak50)
3. 07:18 AM - Re: Re: GPI bladder fuel tanks (Jan Mevis)
4. 07:41 AM - Re: GPI bladder fuel tanks (tjyak50)
5. 07:55 AM - Re: Re: GPI bladder fuel tanks (A. Dennis Savarese)
6. 08:14 AM - Re: Re: GPI bladder fuel tanks (Jan Mevis)
7. 09:27 AM - Re: Re: GPI bladder fuel tanks (Walter Lannon)
8. 09:36 AM - Re: Re: GPI bladder fuel tanks (A. Dennis Savarese)
9. 10:44 AM - Re: Re: GPI bladder fuel tanks (Gill Gutierrez)
10. 11:51 AM - Re: Re: GPI bladder fuel tanks (A. Dennis Savarese)
11. 12:59 PM - Re: Re: GPI bladder fuel tanks (Tom Elliott)
12. 02:33 PM - Looking for yak52 rear cockpit gear selector (Nigel Willson)
13. 02:56 PM - Re: Looking for yak52 rear cockpit gear selector (Robin Hou)
14. 03:00 PM - Re: Looking for yak52 rear cockpit gear selector (A. Dennis Savarese)
15. 03:23 PM - Re: Looking for yak52 rear cockpit gear selector (George Coy)
16. 03:34 PM - Re: Looking for yak52 rear cockpit gear selector (Roger Baker)
17. 10:59 PM - Re: Another day in a Viper (Tim Gagnon)
Message 1
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| Subject: | Re: GPI bladder fuel tanks |
We installed Dennis' fuel bladders in our Yak 52. It is great, having an
additional 50 extra liters.
But for the fuel senders: the bladders are deeper, so the first 8
centimeters (more or less, I don't remember exactly) are not measured.
When the indicators are in the red, there's still some 40 liters on board.
This also means that there's no simple linear and accurate modification, so
we think about installing a fuel flow meter.
Then the fuel gauges merely serve as a quick check.
Jan
PS: the installation of these fuel bladders has been discussed with the
Yakovlev Design Bureau, and they did not see any problem because nothing
changed on the balance.
The only limitation is that we must not do any aerobatics with more than 12
0
liters of fuel.
But it is not an "officially "accepted modification by YDB.
As far as I know, they will never officially accept a foreign modification.
From: Walter Lannon <wlannon@shaw.ca>
Subject: Re: Yak-List: GPI bladder fuel tanks
>From your numbers the bladder holds 36 litres more than the standard tank.
The fuel level sending unit is a float type and senses the vertical positio
n
of the fuel surface. The fuel guage shows a maximum of 60 litres in the
standard tank (probably because that is the maximum travel of the float arm
in that particular sending unit) and with it installed in the larger tank i
t
will also show 60 litres when the fuel surface is at the same height. The
actual fuel quantity in the bladder will be something more than 60 litres.
Whatever that number is it will represent the maximum guage reading for tha
t
particular system.
It would be necessary to calibrate the system by adding fuel in 5 (or 10?)
litre increments and noting the guage reading for each increment. With
that information a calibration card could be produced showing the actual
fuel quantity for each guage reading. That information could also be used
to fabricate a new dial plate for the guage.
In any case I doubt that the sending unit range is adequate to read the ful
l
fuel quantity.
Walt
PS: I note your spelling is in proper accordance with the King=B9s
English!!!!!!
From: Dr. Robert Schroeder <mailto:Firedog@visi.com>
Sent: Sunday, March 17, 2013 3:44 PM
Subject: Yak-List: GPI bladder fuel tanks
Yaksters...
Kelley Monroe and I just installed a set of GPI bladder fuel tanks in my CJ
.
We are now at the fuel level calibration stage. My interpretation of the
'dialing in" instructions suggest that the pilot will only be able to tell
how much fuel is in each tank(s) when their respective levels are below 63
litres...and that the gauge will not show or display the full 113 litre or
30 gallon available. How have the rest of you (~50 kits sold to date)
addressed this problem? Send the fuel gauge out to be renumbered? Ignore
the lack of real time fuel consumption data and stay cool until the needle
starts to move off the "6"? Please give me some guidance.
All the best,
Robert
N6343U
MIC based...Minnesota...home of the cold and untanned!
Dr. Robert A. Schroeder
Schroeder Fire Inc.
612.922.2349
href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com
/
Navigator?Yak-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 2
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| Subject: | Re: GPI bladder fuel tanks |
The indicating system is not a simple resitance value to the indicator?
If it was you could use parallel or series resistors to make the needle show full
/ empty then reface the indicator.
It may be a different type or I guess this would already have bewn tried.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=396463#396463
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| Subject: | Re: GPI bladder fuel tanks |
The Yak fuel gauge system is quite sophisticated. It's made by the
military for the military.
I think that someone described it some time ago on this list. (Rob ?).
Jan
On 18/03/13 14:57, "tjyak50" <tomjohnson@cox.net> wrote:
>
>The indicating system is not a simple resitance value to the indicator?
>
>If it was you could use parallel or series resistors to make the needle
>show full / empty then reface the indicator.
>
>It may be a different type or I guess this would already have bewn tried.
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=396463#396463
>
>
Message 4
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| Subject: | Re: GPI bladder fuel tanks |
Jan I think we are talking only about the Nanchang fuel indicating system, which
is different from the Yak fuel indicating system on account of its an indigenous
design.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=396471#396471
Message 5
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| Subject: | Re: GPI bladder fuel tanks |
The CJ bladders which were referred to in the original post use a
totally new fuel sender. Unlike the Yak 52 bladders which use the
original fuel senders. The CJ6 fuel senders do require calibration for
both full and a low fuel level determined by the owner/installer.
Therefore, the tanks will have to be filled and then drained down to the
low level desired and the potentiometers set on the fuel senders.
Fuel instruments are not intended to be precise fuel remaining
indicators, just like in automobiles with Full, 3/4, 1/2, 14, Empty
marks. These instruments show approximately how much fuel remains in
the tank. Once the new CJ fuel senders are calibrated, the pilot knows
the approximate amount of fuel remaining in the tank by 1 - reading the
fuel instrument and 2 - by the light coming on which the owner/installer
set during the calibration. Lets say 15 liters.
If one wants a more accurate reading, then I always recommend installed
a JPI FS450G fuel flow instrument (or similar instrument), calibrating
the K factor during the first 4-5 fill ups, and now one will know within
a couple of tenths of a liter how much fuel has been used and how much
fuel remains in the tanks, plus of course instant fuel flow based on the
current power setting.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/18/2013 9:15 AM, Jan Mevis wrote:
>
> The Yak fuel gauge system is quite sophisticated. It's made by the
> military for the military.
> I think that someone described it some time ago on this list. (Rob ?).
>
> Jan
>
> On 18/03/13 14:57, "tjyak50" <tomjohnson@cox.net> wrote:
>
>>
>> The indicating system is not a simple resitance value to the indicator?
>>
>> If it was you could use parallel or series resistors to make the needle
>> show full / empty then reface the indicator.
>>
>> It may be a different type or I guess this would already have bewn tried.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=396463#396463
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 6
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| Subject: | Re: GPI bladder fuel tanks |
Sorry, I missed the line of the topic.
Jan
On 18/03/13 15:39, "tjyak50" <tomjohnson@cox.net> wrote:
>
>Jan I think we are talking only about the Nanchang fuel indicating
>system, which is different from the Yak fuel indicating system on account
>of its an indigenous design.
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=396471#396471
>
>
Message 7
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| Subject: | Re: GPI bladder fuel tanks |
Hi Dennis;
I had assumed from Robert's post that he was considering re-calibration of
the existing CJ6 fuel senders. I was not aware that the bladders came with
a new sending unit.
Walt
-----Original Message-----
From: A. Dennis Savarese
Sent: Monday, March 18, 2013 7:52 AM
Subject: Re: Yak-List: Re: GPI bladder fuel tanks
<dsavarese0812@bellsouth.net>
The CJ bladders which were referred to in the original post use a
totally new fuel sender. Unlike the Yak 52 bladders which use the
original fuel senders. The CJ6 fuel senders do require calibration for
both full and a low fuel level determined by the owner/installer.
Therefore, the tanks will have to be filled and then drained down to the
low level desired and the potentiometers set on the fuel senders.
Fuel instruments are not intended to be precise fuel remaining
indicators, just like in automobiles with Full, 3/4, 1/2, 14, Empty
marks. These instruments show approximately how much fuel remains in
the tank. Once the new CJ fuel senders are calibrated, the pilot knows
the approximate amount of fuel remaining in the tank by 1 - reading the
fuel instrument and 2 - by the light coming on which the owner/installer
set during the calibration. Lets say 15 liters.
If one wants a more accurate reading, then I always recommend installed
a JPI FS450G fuel flow instrument (or similar instrument), calibrating
the K factor during the first 4-5 fill ups, and now one will know within
a couple of tenths of a liter how much fuel has been used and how much
fuel remains in the tanks, plus of course instant fuel flow based on the
current power setting.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/18/2013 9:15 AM, Jan Mevis wrote:
>
> The Yak fuel gauge system is quite sophisticated. It's made by the
> military for the military.
> I think that someone described it some time ago on this list. (Rob ?).
>
> Jan
>
> On 18/03/13 14:57, "tjyak50" <tomjohnson@cox.net> wrote:
>
>>
>> The indicating system is not a simple resitance value to the indicator?
>>
>> If it was you could use parallel or series resistors to make the needle
>> show full / empty then reface the indicator.
>>
>> It may be a different type or I guess this would already have bewn tried.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=396463#396463
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 8
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| Subject: | Re: GPI bladder fuel tanks |
Hi Walt,
Totally understand that. Perfectly logical assumption. If I did not
know they came with new fuel senders, I would have assumed the same thing.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/18/2013 11:23 AM, Walter Lannon wrote:
>
> Hi Dennis;
>
> I had assumed from Robert's post that he was considering
> re-calibration of the existing CJ6 fuel senders. I was not aware
> that the bladders came with a new sending unit.
>
> Walt
>
> -----Original Message----- From: A. Dennis Savarese
> Sent: Monday, March 18, 2013 7:52 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Re: GPI bladder fuel tanks
>
> <dsavarese0812@bellsouth.net>
>
> The CJ bladders which were referred to in the original post use a
> totally new fuel sender. Unlike the Yak 52 bladders which use the
> original fuel senders. The CJ6 fuel senders do require calibration for
> both full and a low fuel level determined by the owner/installer.
> Therefore, the tanks will have to be filled and then drained down to the
> low level desired and the potentiometers set on the fuel senders.
>
> Fuel instruments are not intended to be precise fuel remaining
> indicators, just like in automobiles with Full, 3/4, 1/2, 14, Empty
> marks. These instruments show approximately how much fuel remains in
> the tank. Once the new CJ fuel senders are calibrated, the pilot knows
> the approximate amount of fuel remaining in the tank by 1 - reading the
> fuel instrument and 2 - by the light coming on which the owner/installer
> set during the calibration. Lets say 15 liters.
>
> If one wants a more accurate reading, then I always recommend installed
> a JPI FS450G fuel flow instrument (or similar instrument), calibrating
> the K factor during the first 4-5 fill ups, and now one will know within
> a couple of tenths of a liter how much fuel has been used and how much
> fuel remains in the tanks, plus of course instant fuel flow based on the
> current power setting.
>
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
> On 3/18/2013 9:15 AM, Jan Mevis wrote:
>>
>> The Yak fuel gauge system is quite sophisticated. It's made by the
>> military for the military.
>> I think that someone described it some time ago on this list. (Rob ?).
>>
>> Jan
>>
>> On 18/03/13 14:57, "tjyak50" <tomjohnson@cox.net> wrote:
>>
>>>
>>> The indicating system is not a simple resitance value to the indicator?
>>>
>>> If it was you could use parallel or series resistors to make the needle
>>> show full / empty then reface the indicator.
>>>
>>> It may be a different type or I guess this would already have bewn
>>> tried.
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=396463#396463
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
Message 9
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| Subject: | Re: GPI bladder fuel tanks |
All
G&C CJ6 bladders are supplied with capitance fuel level sender probe which
provides accurate level measurement within its calibration range. It
provides a resistance value in the circuit that the fuel gauge reads. Not
all the fuel can be measured because of the dihedral wing in which the fuel
cavity is located. The original metal tanks had the same measurement
limitation in that the first 15 liters were not measured by the float level
sender. The recommended use for the senders in the bladders allows that the
additional are not measured and only the last 60 liters is measured because
that what CJ pilots are used to. It is possible to reface the gauge to
reflect more of the fuel and calibrate the sender accordingly, but as the
system designer I have not checked the linearity of the gauge in its
response to the signal from the sender. A quick look at the gauge face
suggests that the gauge is not totally linear in its response. It would be
easier to install a digital gauge/display or do as Dennis suggests, all of
which are available. Dennis' approach will account for all the fuel but not
by individual bladder.
Gill
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
Sent: Monday, March 18, 2013 9:33 AM
Subject: Re: Yak-List: Re: GPI bladder fuel tanks
--> <dsavarese0812@bellsouth.net>
Hi Walt,
Totally understand that. Perfectly logical assumption. If I did not know
they came with new fuel senders, I would have assumed the same thing.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/18/2013 11:23 AM, Walter Lannon wrote:
>
> Hi Dennis;
>
> I had assumed from Robert's post that he was considering
> re-calibration of the existing CJ6 fuel senders. I was not aware
> that the bladders came with a new sending unit.
>
> Walt
>
> -----Original Message----- From: A. Dennis Savarese
> Sent: Monday, March 18, 2013 7:52 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Re: GPI bladder fuel tanks
>
> <dsavarese0812@bellsouth.net>
>
> The CJ bladders which were referred to in the original post use a
> totally new fuel sender. Unlike the Yak 52 bladders which use the
> original fuel senders. The CJ6 fuel senders do require calibration
> for both full and a low fuel level determined by the owner/installer.
> Therefore, the tanks will have to be filled and then drained down to
> the low level desired and the potentiometers set on the fuel senders.
>
> Fuel instruments are not intended to be precise fuel remaining
> indicators, just like in automobiles with Full, 3/4, 1/2, 14, Empty
> marks. These instruments show approximately how much fuel remains in
> the tank. Once the new CJ fuel senders are calibrated, the pilot
> knows the approximate amount of fuel remaining in the tank by 1 -
> reading the fuel instrument and 2 - by the light coming on which the
> owner/installer set during the calibration. Lets say 15 liters.
>
> If one wants a more accurate reading, then I always recommend
> installed a JPI FS450G fuel flow instrument (or similar instrument),
> calibrating the K factor during the first 4-5 fill ups, and now one
> will know within a couple of tenths of a liter how much fuel has been
> used and how much fuel remains in the tanks, plus of course instant
> fuel flow based on the current power setting.
>
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
> On 3/18/2013 9:15 AM, Jan Mevis wrote:
>>
>> The Yak fuel gauge system is quite sophisticated. It's made by the
>> military for the military.
>> I think that someone described it some time ago on this list. (Rob ?).
>>
>> Jan
>>
>> On 18/03/13 14:57, "tjyak50" <tomjohnson@cox.net> wrote:
>>
>>>
>>> The indicating system is not a simple resitance value to the indicator?
>>>
>>> If it was you could use parallel or series resistors to make the
>>> needle show full / empty then reface the indicator.
>>>
>>> It may be a different type or I guess this would already have bewn
>>> tried.
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=396463#396463
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
Message 10
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| Subject: | Re: GPI bladder fuel tanks |
Now that is straight from the designer of the CJ bladders! Thanks Gill.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/18/2013 12:41 PM, Gill Gutierrez wrote:
>
> All
>
> G&C CJ6 bladders are supplied with capitance fuel level sender probe which
> provides accurate level measurement within its calibration range. It
> provides a resistance value in the circuit that the fuel gauge reads. Not
> all the fuel can be measured because of the dihedral wing in which the fuel
> cavity is located. The original metal tanks had the same measurement
> limitation in that the first 15 liters were not measured by the float level
> sender. The recommended use for the senders in the bladders allows that the
> additional are not measured and only the last 60 liters is measured because
> that what CJ pilots are used to. It is possible to reface the gauge to
> reflect more of the fuel and calibrate the sender accordingly, but as the
> system designer I have not checked the linearity of the gauge in its
> response to the signal from the sender. A quick look at the gauge face
> suggests that the gauge is not totally linear in its response. It would be
> easier to install a digital gauge/display or do as Dennis suggests, all of
> which are available. Dennis' approach will account for all the fuel but not
> by individual bladder.
>
> Gill
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
> Sent: Monday, March 18, 2013 9:33 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Re: GPI bladder fuel tanks
>
> --> <dsavarese0812@bellsouth.net>
>
> Hi Walt,
> Totally understand that. Perfectly logical assumption. If I did not know
> they came with new fuel senders, I would have assumed the same thing.
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
> On 3/18/2013 11:23 AM, Walter Lannon wrote:
>>
>> Hi Dennis;
>>
>> I had assumed from Robert's post that he was considering
>> re-calibration of the existing CJ6 fuel senders. I was not aware
>> that the bladders came with a new sending unit.
>>
>> Walt
>>
>> -----Original Message----- From: A. Dennis Savarese
>> Sent: Monday, March 18, 2013 7:52 AM
>> To: yak-list@matronics.com
>> Subject: Re: Yak-List: Re: GPI bladder fuel tanks
>>
>> <dsavarese0812@bellsouth.net>
>>
>> The CJ bladders which were referred to in the original post use a
>> totally new fuel sender. Unlike the Yak 52 bladders which use the
>> original fuel senders. The CJ6 fuel senders do require calibration
>> for both full and a low fuel level determined by the owner/installer.
>> Therefore, the tanks will have to be filled and then drained down to
>> the low level desired and the potentiometers set on the fuel senders.
>>
>> Fuel instruments are not intended to be precise fuel remaining
>> indicators, just like in automobiles with Full, 3/4, 1/2, 14, Empty
>> marks. These instruments show approximately how much fuel remains in
>> the tank. Once the new CJ fuel senders are calibrated, the pilot
>> knows the approximate amount of fuel remaining in the tank by 1 -
>> reading the fuel instrument and 2 - by the light coming on which the
>> owner/installer set during the calibration. Lets say 15 liters.
>>
>> If one wants a more accurate reading, then I always recommend
>> installed a JPI FS450G fuel flow instrument (or similar instrument),
>> calibrating the K factor during the first 4-5 fill ups, and now one
>> will know within a couple of tenths of a liter how much fuel has been
>> used and how much fuel remains in the tanks, plus of course instant
>> fuel flow based on the current power setting.
>>
>> Dennis
>>
>> A. Dennis Savarese
>> 334-285-6263
>> 334-546-8182 (mobile)
>> www.yak-52.com
>> Skype - Yakguy1
>>
>> On 3/18/2013 9:15 AM, Jan Mevis wrote:
>>>
>>> The Yak fuel gauge system is quite sophisticated. It's made by the
>>> military for the military.
>>> I think that someone described it some time ago on this list. (Rob ?).
>>>
>>> Jan
>>>
>>> On 18/03/13 14:57, "tjyak50" <tomjohnson@cox.net> wrote:
>>>
>>>>
>>>> The indicating system is not a simple resitance value to the indicator?
>>>>
>>>> If it was you could use parallel or series resistors to make the
>>>> needle show full / empty then reface the indicator.
>>>>
>>>> It may be a different type or I guess this would already have bewn
>>>> tried.
>>>>
>>>>
>>>>
>>>>
>>>> Read this topic online here:
>>>>
>>>> http://forums.matronics.com/viewtopic.php?p=396463#396463
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 11
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| Subject: | Re: GPI bladder fuel tanks |
I have had Gill's tanks and level senders for seven years. My recommendation
is leave the gauge
alone
after modifying the wiring per the instructions and calibrating the Capacitance
sender the accuracy
is outstanding
far better than any span can I have ever owned. When I pull into the gas pit 98%
of the time I can
tell within +- 1 gallon
how much fuel it will take to top off. I have checked this over several hundred
hours of operation.
As to calibration as you only need to set the full and empty points leave the senders
out of the
tank and
get beaker jar or a tall flower vase fill with fuel and you can very quickly Cal.
and verify the
sender.
Without the pain in the ass of draining and filling the tanks several times.
Tom Elliott
CJ-6A NX63727
777 Quartz Ave
PMB 7004
Sandy Valley NV
89019
Cell 541-297-5497
N13472@AOL.COM
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of
Gill Gutierrez
Sent: Monday, March 18, 2013 10:42 AM
Subject: RE: Yak-List: Re: GPI bladder fuel tanks
All
G&C CJ6 bladders are supplied with capitance fuel level sender probe which provides
accurate level
measurement within its calibration range. It provides a resistance value in the
circuit that the
fuel gauge reads. Not all the fuel can be measured because of the dihedral wing
in which the fuel
cavity is located. The original metal tanks had the same measurement limitation
in that the first
15 liters were not measured by the float level sender. The recommended use for
the senders in the
bladders allows that the additional are not measured and only the last 60 liters
is measured because
that what CJ pilots are used to. It is possible to reface the gauge to reflect
more of the fuel and
calibrate the sender accordingly, but as the system designer I have not checked
the linearity of the
gauge in its response to the signal from the sender. A quick look at the gauge
face suggests that
the gauge is not totally linear in its response. It would be easier to install
a digital
gauge/display or do as Dennis suggests, all of which are available. Dennis' approach
will account
for all the fuel but not by individual bladder.
Gill
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
Sent: Monday, March 18, 2013 9:33 AM
Subject: Re: Yak-List: Re: GPI bladder fuel tanks
--> <dsavarese0812@bellsouth.net>
Hi Walt,
Totally understand that. Perfectly logical assumption. If I did not know they
came with new fuel
senders, I would have assumed the same thing.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/18/2013 11:23 AM, Walter Lannon wrote:
>
> Hi Dennis;
>
> I had assumed from Robert's post that he was considering
> re-calibration of the existing CJ6 fuel senders. I was not aware
> that the bladders came with a new sending unit.
>
> Walt
>
> -----Original Message----- From: A. Dennis Savarese
> Sent: Monday, March 18, 2013 7:52 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Re: GPI bladder fuel tanks
>
> <dsavarese0812@bellsouth.net>
>
> The CJ bladders which were referred to in the original post use a
> totally new fuel sender. Unlike the Yak 52 bladders which use the
> original fuel senders. The CJ6 fuel senders do require calibration
> for both full and a low fuel level determined by the owner/installer.
> Therefore, the tanks will have to be filled and then drained down to
> the low level desired and the potentiometers set on the fuel senders.
>
> Fuel instruments are not intended to be precise fuel remaining
> indicators, just like in automobiles with Full, 3/4, 1/2, 14, Empty
> marks. These instruments show approximately how much fuel remains in
> the tank. Once the new CJ fuel senders are calibrated, the pilot
> knows the approximate amount of fuel remaining in the tank by 1 -
> reading the fuel instrument and 2 - by the light coming on which the
> owner/installer set during the calibration. Lets say 15 liters.
>
> If one wants a more accurate reading, then I always recommend
> installed a JPI FS450G fuel flow instrument (or similar instrument),
> calibrating the K factor during the first 4-5 fill ups, and now one
> will know within a couple of tenths of a liter how much fuel has been
> used and how much fuel remains in the tanks, plus of course instant
> fuel flow based on the current power setting.
>
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
> On 3/18/2013 9:15 AM, Jan Mevis wrote:
>>
>> The Yak fuel gauge system is quite sophisticated. It's made by the
>> military for the military.
>> I think that someone described it some time ago on this list. (Rob ?).
>>
>> Jan
>>
>> On 18/03/13 14:57, "tjyak50" <tomjohnson@cox.net> wrote:
>>
>>>
>>> The indicating system is not a simple resitance value to the indicator?
>>>
>>> If it was you could use parallel or series resistors to make the
>>> needle show full / empty then reface the indicator.
>>>
>>> It may be a different type or I guess this would already have bewn
>>> tried.
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=396463#396463
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
much more:
Message 12
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| Subject: | Looking for yak52 rear cockpit gear selector |
All,
Looking for a replacement rear cockpit gear selector for a yak52.
Current one has begun to cause problems with air leakage, and exercise of it has
a limited fault curing success rate.
I can confirm this is the selector at fault, and not a ram seal problem feeding
back through the selector.
Any bright ideas considered, but my understanding is that there are no seals inside
it, just machined plates with holes positioned for selection purposes.
So... If anyone has a GOOD one they are willing to part with, please contact me
off list.
I am in the uk.
Regards
Nigel Willson
Nigel@yakdisplay.com
Message 13
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| Subject: | Re: Looking for yak52 rear cockpit gear selector |
I think M14P, Inc. can overhaul them. Call Jill at 928-681-4400=0A=0A=0A___
_____________________________=0A From: Nigel Willson <nigel@yakdisplay.com>
=0ATo: "yak-list@matronics.com" <yak-list@matronics.com> =0ASent: Monday, M
arch 18, 2013 2:29 PM=0ASubject: Yak-List: Looking for yak52 rear cockpit g
display.com>=0A=0AAll,=0A=0ALooking for a replacement rear cockpit gear sel
ector for a yak52.=0ACurrent one has begun to cause problems with air leaka
ge, and exercise of it has a limited fault curing success rate.=0AI can con
firm this is the selector at fault, and not a ram seal problem feeding back
through the selector.=0AAny bright ideas considered, but my understanding
is that there are no seals inside it, just machined plates with holes posit
ioned for selection purposes.=0ASo... If anyone has a GOOD one they are wil
ling to part with, please contact me off list.=0AI am in the uk.=0A=0ARegar
- - - - - - - - - - - - -Matt Dralle, List Admin.
====
Message 14
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| Subject: | Re: Looking for yak52 rear cockpit gear selector |
Fabricate a bypass (there are 3 sets of "in's and out's. ie: 6 fittings
on the rear selector) and eliminate it completely from the system. It
is totally unnecessary and only another point of failure due to lack of
use as many people have found out. Photo attached is of a Yak 52
without a rear gear selector.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 3/18/2013 4:29 PM, Nigel Willson wrote:
>
> All,
>
> Looking for a replacement rear cockpit gear selector for a yak52.
> Current one has begun to cause problems with air leakage, and exercise of it
has a limited fault curing success rate.
> I can confirm this is the selector at fault, and not a ram seal problem feeding
back through the selector.
> Any bright ideas considered, but my understanding is that there are no seals
inside it, just machined plates with holes positioned for selection purposes.
> So... If anyone has a GOOD one they are willing to part with, please contact
me off list.
> I am in the uk.
>
> Regards
>
> Nigel Willson
> Nigel@yakdisplay.com
>
>
Message 15
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| Subject: | Re: Looking for yak52 rear cockpit gear selector |
We have some
George Coy
Sent from my iPhone
On Mar 18, 2013, at 5:53 PM, Robin Hou <rmhou@yahoo.com> wrote:
> I think M14P, Inc. can overhaul them. Call Jill at 928-681-4400
>
> From: Nigel Willson <nigel@yakdisplay.com>
> To: "yak-list@matronics.com" <yak-list@matronics.com>
> Sent: Monday, March 18, 2013 2:29 PM
> Subject: Yak-List: Looking for yak52 rear cockpit gear selector
>
>
> All,
>
> Looking for a replacement rear cockpit gear selector for a yak52.
> Current one has begun to cause problems with air leakage, and exercise of i
t has a limited fault curing success rate.
> I can confirm this is the selector at fault, and not a ram seal problem fe
eding back through the selector.
> Any bright ideas considered, but my understanding is that there are no sea
ls inside it, just machined plates with holes positioned for selection purpo
ses.
> So... If anyone has a GOOD one they are willing to part with, please conta
ct me off list.
> I am in the uk.
>
> Regards
>
> Nigel Willson
> Nigel@yakdisplay.com
>
>
>
>
>
>
>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
>
Message 16
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| Subject: | Re: Looking for yak52 rear cockpit gear selector |
I have done several hundred hours of instructing in the 52....checkouts, acro training,
and spin training. I am unwilling to work in a rear cockpit in which
the rear gear selector has been blocked off in neutral, removed or otherwise
emasculated.
My choice, of course. But the airplane was designed to be fully flyable by an
IP in the rear seat...and that's the way I like it to be. YMMV
Roger Baker
On Mar 18, 2013, at 2:58 PM, "A. Dennis Savarese" <dsavarese0812@bellsouth.net>
wrote:
> Fabricate a bypass (there are 3 sets of "in's and out's. ie: 6 fittings on the
rear selector) and eliminate it completely from the system. It is totally
unnecessary and only another point of failure due to lack of use as many people
have found out. Photo attached is of a Yak 52 without a rear gear selector.
>
> Dennis
>
> A. Dennis Savarese
> 334-285-6263
> 334-546-8182 (mobile)
> www.yak-52.com
> Skype - Yakguy1
>
> On 3/18/2013 4:29 PM, Nigel Willson wrote:
>>
>> All,
>>
>> Looking for a replacement rear cockpit gear selector for a yak52.
>> Current one has begun to cause problems with air leakage, and exercise of it
has a limited fault curing success rate.
>> I can confirm this is the selector at fault, and not a ram seal problem feeding
back through the selector.
>> Any bright ideas considered, but my understanding is that there are no seals
inside it, just machined plates with holes positioned for selection purposes.
>> So... If anyone has a GOOD one they are willing to part with, please contact
me off list.
>> I am in the uk.
>>
>> Regards
>>
>> Nigel Willson
>> Nigel@yakdisplay.com
>>
>>
>>
>>
>>
>
> <CIMG4148.JPG>
Message 17
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| Subject: | Re: Another day in a Viper |
He is on this board..and owns a Yak-50. He is in the F-22 now.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=396570#396570
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