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Paul A. Franz, P.E.
Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA
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 Posted: Wed Apr 08, 2009 4:35 pm Post subject: Fuel Flow Display |
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On Wed, April 8, 2009 11:55 am, akflyer wrote:
I just had a look and was surprised to read this:
# Instant fuel flow: 2.5 to 130 Liters/hour, 1.3 to 36 US gallons/hour
I wonder if they can be furnished with a bit lower flow range. What happens at idle?
Do you get a zero reading? It would seem to me that the capacity range would be more
ideal if it were from 0.1 to 10 gal/hr.
I don't know what to do for fuel gauges. The wing tanks I have are aluminum but fairly
flat and the are aligned parallel with the bottom of the wing so no float type gauge
is going to work especially in the top or bottom quarter of the tank and in between it
would be so non-linear that wouldn't work. I could put site glasses on them but that
would mean disconnecting the lines to them to remove my wings. The other alternative
is to use the full immersion type sensor that you can calibrate but that would cost
%500/tank or more. So I considering using just one of these flow sensors, keeping
track of fill points. might be a problem is you just add some fuel but don't fill the
tanks. Not sure if you could reset the gauge to a particular setting.
Must be more than one of you has thought through this problem. Even if you haven't
finished the process, your ideas so far would be appreciated.
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
"Every child in America should be acquainted with his own country.
He should read books that furnish him with ideas that will be useful
to him in life and practice. As soon as he opens his lips, he should
rehearse the history of his own country."
-- Noah Webster, On the Education of Youth in America, 1788
"To take from one, because it is thought his own industry and that
of his fathers has acquired too much, in order to spare to others,
who, or whose fathers, have not exercised equal industry and
skill, is to violate arbitrarily the first principle of
association, the guarantee to everyone the free exercise of his
industry and the fruits acquired by it."
-- Thomas Jefferson
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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office |
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akflyer
Joined: 07 May 2007
Posts: 574
Location: Soldotna AK
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| Posted: Wed Apr 08, 2009 5:46 pm Post subject: Re: Fuel Flow Display |
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at 1600 rpm idle it shows a steady .5 GPH. It will cover you for all that you need in the plane. As with any instrument, it will have a range that it is most accurate in, but lets be realistic, you will probably start up and idle for 5 minutes or so till she's warm, then you will be well above the the range specified for flight, then maybe 5 or 6 minutes of idle time to land and taxi in and shut down. The fuel burned in that small amount of time is not really going to affect you measurements, as you reset the fuel on board each time you fill up or put gas in (at least I do) and that means for me every flight. I don't fill the tanks to the brim when I am planning a short flight of say an hour. Why have 6 hrs of fuel on board. I put in what I need, and a little reserve for each flight.
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_________________
DO NOT ARCHIVE
Leonard Perry aka SNAKE
Soldotna AK
Avid "C" / Mk IV
582 (147 hrs and counting on the rebuild)
IVO IFA
Full Lotus 1450
#1 snake oil salesman since 1-22-2009
I would rather die trying to live, than to live trying not to die.... |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Thu Apr 09, 2009 1:50 am Post subject: Fuel Flow Display |
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Mine shows down to .1 or .2 when I'm on final or taxiing....can't
recall which, as I'm doing other things at the time, but it's low.
This is the Northstar F210 that I'm talking about. Of course, my idle
is about 500-800 rpm.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 624.3 hrs
Sensenich 62x46
Electroair direct-fire ignition system
Status: flying
On Apr 8, 2009, at 9:46 PM, akflyer wrote:
| Quote: |
at 1600 rpm idle it shows a steady .5 GPH. It will cover you for
all that you need in the plane. As with any instrument, it will
have a range that it is most accurate in, but lets be realistic,
you will probably start up and idle for 5 minutes or so till she's
warm, then you will be well above the the range specified for
flight, then maybe 5 or 6 minutes of idle time to land and taxi in
and shut down. The fuel burned in that small amount of time is not
really going to affect you measurements, as you reset the fuel on
board each time you fill up or put gas in (at least I do) and that
means for me every flight. I don't fill the tanks to the brim
when I am planning a short flight of say an hour. Why have 6 hrs
of fuel on board. I put in what I need, and a little reserve for
each flight.
--------
DO NOT ARCHIVE
Leonard Perry aka SNAKE
Soldotna AK
Avid "C" / Mk IV
582 IVO IFA
Full Lotus 1260
#1 snake oil salesman since 1-22-2009
hander outer of humorless darwin awards
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 38417#238417
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Dick Maddux
Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl
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| Posted: Thu Apr 09, 2009 3:50 am Post subject: Fuel Flow Display |
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Thanks for the update Steve ! Mine has worked fine so far although I had to adjust the fuel flow up a bit on the instrument to equal the actual fuel being used. It is really a handy unit to have especially during turbulent conditions.It's nice to see a steady fuel quantity.
Dick Maddux
Fox 4-1200
912 UL
Pensacola,Fl
Feeling the pinch at the grocery store? Make dinner for $10 or less.
[quote][b]
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Dick Maddux
Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl
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| Posted: Thu Apr 09, 2009 4:12 am Post subject: Fuel Flow Display |
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I too, like Leonard , indicate about . 5 gal per hour at idle. When I am at cruise the factory preset indication was showing about 3.5 gph which was working out a little low so I adjusted it up to about 4 gph. I am still in the process of tweaking it but it is really close enough.
I keep my plane in a hanger at my airpark so when I put in an additional 5 gal from my gas bowser I adjust the total on board quantity on the gauge to match the wing tank sight gauge indications as the plane sits on the ground. I have drained the tanks about 4 times and the sight gauge indication (ground) is very close to the actual fuel on board.
As mentioned previously my sight gauges bounce all over the place in flight so it is nice to look at a digital fuel quantity on a gauge. So far, the Northstar has worked out really well and was a good economical addition.
Dick Maddux
Pensacola,Fl
Feeling the pinch at the grocery store? Make dinner for $10 or less.
[quote][b]
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pwmac(at)sisna.com
Guest
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| Posted: Thu Apr 09, 2009 5:28 am Post subject: Fuel Flow Display |
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An in tank version that seems popular is the capacitance type. It can
be cut to fit your tank. Check the suppliers.
As far as the Northstar goes. I think if you are concerned just run
a calibration test. Use your shutoff valve to throttle the gravity
flow into a calibrated catch can. Then compare what you get from the reading.
Paul
=========
At 06:34 PM 4/8/2009, you wrote:
| Quote: |
<paul(at)eucleides.com>
On Wed, April 8, 2009 11:55 am, akflyer wrote:
>
>
> for anyone intersted in these units, here is a site that has them
for $116.95 alot
> less than I paid for mine a couple years ago.
>
> http://www.roguewavemarine.com/store/northstar-fuel-210-f210-pr-12173.html
I just had a look and was surprised to read this:
# Instant fuel flow: 2.5 to 130 Liters/hour, 1.3 to 36 US gallons/hour
I wonder if they can be furnished with a bit lower flow range. What
happens at idle?
Do you get a zero reading? It would seem to me that the capacity
range would be more
ideal if it were from 0.1 to 10 gal/hr.
I don't know what to do for fuel gauges. The wing tanks I have are
aluminum but fairly
flat and the are aligned parallel with the bottom of the wing so no
float type gauge
is going to work especially in the top or bottom quarter of the tank
and in between it
would be so non-linear that wouldn't work. I could put site glasses
on them but that
would mean disconnecting the lines to them to remove my wings. The
other alternative
is to use the full immersion type sensor that you can calibrate but
that would cost
%500/tank or more. So I considering using just one of these flow
sensors, keeping
track of fill points. might be a problem is you just add some fuel
but don't fill the
tanks. Not sure if you could reset the gauge to a particular setting.
Must be more than one of you has thought through this problem. Even
if you haven't
finished the process, your ideas so far would be appreciated.
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
"Every child in America should be acquainted with his own country.
He should read books that furnish him with ideas that will be useful
to him in life and practice. As soon as he opens his lips, he should
rehearse the history of his own country."
-- Noah Webster, On the Education of Youth in America, 1788
"To take from one, because it is thought his own industry and that
of his fathers has acquired too much, in order to spare to others,
who, or whose fathers, have not exercised equal industry and
skill, is to violate arbitrarily the first principle of
association, the guarantee to everyone the free exercise of his
industry and the fruits acquired by it."
-- Thomas Jefferson
|
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Fox5flyer
Guest
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| Posted: Thu Apr 09, 2009 6:27 am Post subject: Fuel Flow Display |
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Another one that might be considered for those who are seeking options is FloScan. The company has been around a long time and has been producing flow instruments for boats and (I think) a certified unit for airplanes. I bought one in 2000 that has been working fine since then and required no calibration. Very accurate right out of the box. Mine is an analog unit which I prefer as I don't have to read it. Just a glance tells me what my flow is. They have many models including digital. Mine has a span of 0-10 gallons which works well for me as I use about 9gph when at full power climb, then at cruise about 4gph.
I did have to replace the transducer though. At about the 250 hour point the rubber seals in it began to dissolve which showed up in the sump checks. After speaking with the tech support they told me that it was because of the new additives in fuel and sent me a new unit with different seals which was a plug and play swap. Also it appears to be a more robust unit.
Most boat vendors will have it in stock. Googling will get tons of hits.
Deke
[quote] ---
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