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Fuel Flow sensor Install

in General Tech Discussion 6 years ago

  • Re: Fuel Flow sensor Install

    by » 6 years ago

    Hi Ed,
    So long as the return line is downstream of the FT60 then you don't need a second FT60 because the fuel has been accounted for once and not coming back through the FT60 again. If your return line is upstream of the FT60 then you would need a second one.
    The idea of the 6" straight is to try and keep air bubbles and vapor from influencing the transducer.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: Ed LeBlanc
      
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  • Re: Fuel Flow sensor Install

    by » 6 years ago

    Hello!

    Are you speaking about applying that thing: http://appretailor.com/accessories/2/ PN: 10143?
    Found it on forum: http://dynonavionics.com/cgi-bin/yabb2/YaBB.pl?num=1165011860

    I have a rotax 914, and want to install ft-60 transducer. Installing two of them to the supply and return line with a ffdm-1 differential module is too expensive, so I search the variants.

    Another variant is to install transducer to a carb fuel line between the fuel divider and stbd carb. And just multiply the flow by 2. But it is not recommended to install ft-60 ner the engine.
    10143_wLFdTJa.jpg (You do not have access to download this file.)
      
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  • Re: Fuel Flow sensor Install

    by » 6 years ago

    I have the FT-60 installed on my 912uls in the fuel line from header tank to engine. Its under the seat in a nice cool vibration free area. It does measure the sum of engine fuel + return fuel, but this has not been a problem for me. By far, most of your flight time is in cruise mode, so I just calibrated the "K" factor to give accurate fuel flow to the engine only at cruise. Here's how I did it: On a cross country of about 100 miles I started with fuel tanks topped off full. At the destination I filled the tanks to the top and recorded the gallons and the exact time of the flight in hours. Gallons/hours = average gal/hr and knowing the exact actual fuel burn I could compare this with the indicated fuel burn from the FT-60. Of course the indicated fuel burn was more than the actual because it was also measuring return flow. I then just reset the "K" factor using the ratio actual gallons/indicated gallons x original "K" factor = new "K" factor.Its been giving accurate results ever since. If you spend a lot of time idling or taxiing, or a lot of time climbing or descending of course the readings will be less accurate. I find I depend on the FT-60 readings mostly on longer x-countries rather than on short hops.
    Thank you said by: RotaxOwner Admin
      
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  • Re: Fuel Flow sensor Install

    by » 6 years ago

    I too am installing an FT-60 on my Rotax 912 S. My Europa Monowheel has a return line. I am going to try and install just 1, FT-60 and see if it works for my needs. Big question here; Did anyone try to move their tank return line ahead of the FT-60 and put the FT-60 just before the Carburetor split (T-line) to measure only fuel going to the carbs as Roger Lee suggested? I don't want to have to buy a second transducer if I don't have to. The FT-60 manufacturer says we do need two sensors but that seems mighty convenient for them to sell $250.00 more worth of a sensor. I have included a sketch of Roger's idea for clarification. A picture is worth a thousand words and fuel for many more questions and critiques. Thank for any help you can give us.
    FT-602sensorbypass.jpg (You do not have access to download this file.)
    Thank you said by: Robert Laird
      
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  • Re: Fuel Flow sensor Install

    by » 6 years ago

    I have that setup on my Remos GX comes stock from the factory.
      
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