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K Factor Fuel flow metre

in General Tech Discussion 12 years ago
Hi all
I have fitted a Trio Auto Pilot to my Searey and it comes with a fuel flow metre
I am having trouble working out how you set the K Factor for the 914 Rotax engine
I was hoping some one out there might be able to steer me in the right direction
regards Markhttp://www.rotax-owner.com/components/com_kunena/template/default/images/emoticons/smile.png

  • Re: K Factor Fuel flow metre

    by » 12 years ago

    Hi Mark,

    What fuel flow transducer do you have? In the installation instructions for the flow transducer it usually list the K factor and then you go into your instrument setup menus and set it. Then keep a really good log for the next 10-15 hrs of flight on the real fuel usage and the K factor may need to be tweaked up or down a tad.

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

      
    Report

  • Re: K Factor Fuel flow metre

    by » 12 years ago

    Hi Roger
    Thank you for your reply the K factor that was in the instructions was entered but when I ran the aircraft up at 2000 RPM it was telling me that I was using 131 litres per hour obviously not right I might have to check that the unit is not faulty unless I have done somthing wrong
    regards
    Mark
      
    Report

  • Re: K Factor Fuel flow metre

    by » 12 years ago

    Hi Mark,

    I would just do the quick and easy double checks. make sure the wires are hooked up correctly, it isn't in backwards, it lays flat for at least 4"-6" prior and after the transducer. All air is out of the hose, it isn't at a high point in the hose and it has the correct voltage.

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

      
    Report

  • Re: K Factor Fuel flow metre

    by » 12 years ago

    Thanks once again Roger I will check the whole system again today
    Can you explain what you mean regards the unit being flat 4" to 6"prior and after the Transducer I did not read anything in the instalation instructions regarding this
    I am sorry if i sound nieve I have enstalled a fuel flow unit before and had no problems what so ever
    thanks once again for all your help
    Mark :)
      
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  • Re: K Factor Fuel flow metre

    by » 12 years ago

    Hi Mark,

    No such thing as nieve and no such thing a a stupid question. Everyone has been there when they first start to learn and for the most part we all stay there because we are always learning. So it just boils down to information gathering filling up our mental file cabinet. So ask all the questions you want.

    Usually when mounting a fuel flow transducer you want the inlet hose line and out to be horizontal for at least 4"-6". This helps keep air bubbles down and makes sure you have a good liquid flow. You don't want the transducer at a high spot where bubbles can accumulate. You also usually want a fuel filter before the transducer because even small debris can cause it to malfunction. These items are usually standard practice, but I'm sure there are some variances.

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

      
    Report
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