Fuel Flow instrument

"Blueskies" wrote in message
om...

"MikeR" wrote in message
...

"Blueskies" wrote in message
. com...

"MikeR" wrote in message
...


No wheel in this one (electrical impulses).



Impulses from what?


Ref: http://203.167.230.122/qiss/scripts/FAQFrame.htm


Title: How does the flow transducer work?
Question/Symptom:
How does the flow transducer work?


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Answer/Solution:
NAVMAN flow transducers are of an optical type. Within the
transducer
are a transmitter and receiver that output an infrared beam through the
body
of the transducer. Inside the transducer is a very precisely dimensioned
turbine running on jewelled bearings. As the fuel flows it spins the
turbine
and the blades cut the infrared beam, which transmits a pulsed signal to
the
fuel computer.



OK, normal stuff. Thanks for the link. The concern from the other folks is
what happens to pressure drop if the (turbine
in this case) wheel seizes up. Usually it will add some pressure drop with
a corresponding restriction to the flow, but
the turbine types pass fluid pretty well even if seized...


They try to address that issue he
http://203.167.230.122/qiss/scripts/FAQFrame.htm

Title: Will the fuel transducer restrict fuel flow?
Question/Symptom:
Will the fuel flow transducer obstruct the fuel supply to my engine?




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Answer/Solution:
The current one-piece flow transducer is rated at a maximum flow rate
of 130 litres per hour (32 US gallons per hour). In modern terms this is a
relatively large amount of fuel especially with the advent of far more
economical engines. In cases where users suspect the flow transducer of
being the cause of a fuel supply problem then it is generally found that the
design of the fuel delivery system is marginal to start with, in other words
adding the flow transducer may be the straw that breaks the camels back but
it is not the cause of the problem. The critical measurement in any outboard
engine fuel system is the total backpressure at full throttle. This is
measured in 'Inches of Mercury'. The absolute maximum acceptable limit
amongst most manufacturers is 7.0 inches of mercury and ideally should be
far less (Always consult your outboard manufacturer for detailed
recommendations). Our fuel transducer creates a maximum backpressure of 1.0
inch of mercury backpressure so even if your manufacturer specified a
maximum of 4.0 inches backpressure then you have plenty of margin for the
fuel delivery system components

On Tue, 15 Mar 2005 19:48:14 -0500, "Billc851"
wrote:

has anyone considered trying a marine fuel flow instrument in home built.
http://www.navman.com/marine/product...100/index.html

I was considering the EI-fp-5 but at $750 it a bit pricy for my budget.. The
marine unit does the same thing for $150

Any thoughts?
Bill

Sounds like a good idea - Now, anyone have any information on a Faure
Herman Flowmeter? I have the indicator head (basically a 1MA meter,
calibrated 1-7 (pphX100)

What does IT run off of???

G'day Bill

I have a Navman in my Murphy Rebel with a 100hp Rotax and it works just
fine. Its accurate to less than 3% and is easy to use.
Navman make a modified unit for aviation and definitely recommend that the
marine version not be used in an aircraft.

Regards

Ian Donaldson




"Greg Piney" wrote in message
...
Bill,

You may want to take a look at the Aveo MaxiSingles model FF-3. It is $172
plus $125 for the sender. I have 2 of their instruments and like them
alot.

http://www.aveousa.com/avionics/inst...gles/index.htm

Greg Piney

Billc851 wrote:
has anyone considered trying a marine fuel flow instrument in home built.
http://www.navman.com/marine/product...100/index.html

I was considering the EI-fp-5 but at $750 it a bit pricy for my budget..
The marine unit does the same thing for $150

Any thoughts?
Bill

On Tue, 15 Mar 2005, Billc851 wrote:

has anyone considered trying a marine fuel flow instrument in home built.

I have been flying for almost two years with the Navman unit.
It works OK as an indicator of fuel flow. I don't like the two
button control for setting fuel remaining, and other features.

The instructions say to include a fuel filter upstream of the
sender, so that junk will not clog it.

George Graham
RX-7 Powered Graham-EZ, N4449E
Homepage http://bfn.org/~ca266

Optical/electrical impulses from a TURBINE WHEEL.

"MikeR" wrote in message
...

"John Kunkel" wrote in message
...

"Billc851" wrote in message
...
has anyone considered trying a marine fuel flow instrument in home
built.
http://www.navman.com/marine/product...100/index.html

I was considering the EI-fp-5 but at $750 it a bit pricy for my
budget..
The marine unit does the same thing for $150

I'd check put the design of the transmitter, aircraft certified FF
transmitters will allow full fuel flow even if the transmitter
malfunctions;
some commercial units reportedly will restrict fuel flow if the internal
wheel seizes up.

No wheel in this one (electrical impulses).

"MikeR" wrote in message ...

Our fuel transducer creates a maximum backpressure of 1.0
inch of mercury backpressure so even if your manufacturer specified a
maximum of 4.0 inches backpressure then you have plenty of margin for the
fuel delivery system components



That is low, and a 32 GPM rated? No issues that I can see...

Thanks Mike!

G'day

I have had the Navman (Mizer) in use for more than two years, and unlike
Graham found it quite easy to use.

I really like the instant fuel flow reading and the trip usage meter. The
fuel gauges in my plane are grossly inaccurate, but the Mizer makes fuel
management a breeze.

I fitted mine upstream of the gascolator. Doing it this way there is no need
to add a separate filter in the system.


Regards

Ian Donaldson


I have been flying for almost two years with the Navman unit.
It works OK as an indicator of fuel flow. I don't like the two
button control for setting fuel remaining, and other features.

The instructions say to include a fuel filter upstream of the
sender, so that junk will not clog it.

George Graham
RX-7 Powered Graham-EZ, N4449E
Homepage http://bfn.org/~ca266

On Fri, 18 Mar 2005, IAN DONALDSON wrote:

I have had the Navman (Mizer) in use for more than two years, and unlike
Graham found it quite easy to use.

That is good to know Ian, I've suspected that my unit might be defective.
The buttons just do not work well.

BTW, I see that www.BoatersWorld.com is selling them for $129.99
including shipping.


George Graham
RX-7 Powered Graham-EZ, N4449E
Homepage http://bfn.org/~ca266

G'day George



I just reread my post and see that I referred to you as "Graham".
Sorry about that. I guess that I got confused! No offence was meant.


Regards

Ian Donaldson.



"George A. Graham" wrote in message
...
On Fri, 18 Mar 2005, IAN DONALDSON wrote:

I have had the Navman (Mizer) in use for more than two years, and unlike
Graham found it quite easy to use.

That is good to know Ian, I've suspected that my unit might be defective.
The buttons just do not work well.

BTW, I see that www.BoatersWorld.com is selling them for $129.99
including shipping.


George Graham
RX-7 Powered Graham-EZ, N4449E
Homepage http://bfn.org/~ca266