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s.vestuti(at)virgin.net
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 Posted: Sun Jul 29, 2007 1:11 pm Post subject: Return Fuel Flow Compensation query |
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Hi, on my Standard Rotax 912S installation there is a return line to the fuel tank, i have callibrated my Fuel Flow meter to read quit accuratly, however, there is an error when the Fuel pump is switched on as the Fuel Flow is intrepeted as being "conciderably higher" when there is in fact no change, anyway, i came across this device http://www.matronics.com/fuelchec/RFC/index.htm which looks as though it may solve my problems so, has any one fitted one and is it any good?
Steve Vestuti G-CEBV #573
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josok-e(at)ukolo.fi
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| Posted: Sun Jul 29, 2007 1:16 pm Post subject: Return Fuel Flow Compensation query |
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Hi Steve,
It's good and i have it. It's not cheap, and you will need a second flow sensor in the return line as well. For the 912 it's possible to go without, have a look at the Dynon avionics pages, there is a much cheaper solution in the D180 installation manual.
Regards,
Jos Okhuijsen
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tonyk(at)kaon.co.nz
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| Posted: Sun Jul 29, 2007 1:36 pm Post subject: Return Fuel Flow Compensation query |
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http://www.matronics.com/fuelchec/RFC/index.htm which looks as though it
may solve my problems so, has any one fitted one and is it any good?
Yes, it's very good. We fitted one to 912 powered ZK-UBD as an input to
the datalogger when we were flight testing the Airmaster prop so we
could get accurate measurements on fuel burn for each of the pitch
settings.
As the datalogger also includes a gps input I have a very useful miles
per gallon and available range indication for long distance trips as a
result.
Tony
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paul.mcallister
Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA
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| Posted: Sun Jul 29, 2007 1:37 pm Post subject: Return Fuel Flow Compensation query |
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Steve,
If you are using the fuel flow system for the Grand Rapids EIS it is
possible to add a flow second sensor.
With that said, it is my understanding that the return flow is minuscule and
the error should be very small.
Paul
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rehn(at)rockisland.com
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| Posted: Sun Jul 29, 2007 2:04 pm Post subject: Return Fuel Flow Compensation query |
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I have the Grand Rapids EIS and tried 1 flow sensor on my 914, it was very
erratic and I couldn't get it to work properly. I contacted Grand Rapids and
they told me I needed the second flow sensor for the 914 which I then
installed and now I have a very accurate fuel flow sensor. I think that the
fuel return can very some especially with the second fuel pump on. Anyway
two works for me, maybe somebody can make a single work.
Jerry
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s.vestuti(at)virgin.net
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| Posted: Sun Jul 29, 2007 2:28 pm Post subject: Return Fuel Flow Compensation query |
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Thanks for the Pos. feedback ,it looks as though ill be fitting the matronics device as my instrument does not allow for two fuel sender inputs ,and as for the Dynon... ,well , i think that will be fitted on my next project...
Steve Vestuti #573 G-CEBV
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