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  • Re: Another in flight adjustable question

    by » 5 weeks ago


    At WOT max rpm you'd be better off seeing 5500 rpm. Don't over stress the engine at WOT and only 5200.


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


  • Re: Another in flight adjustable question

    by » 5 weeks ago


    Before Rotax released the chart showing the envelope we may fly in there seemed to be and almost endless discussion going on about wether it makes a difference to fly real high WOT (with consequently reduced MAP) or lower with a pitched prop, thus lower revs and consequently reduced MAP. Eventually the conclusion was that there is no difference, technically speaking. Soon after that the chart was released by Rotax to answer all questions regarding the engines capabilities.

    If you gain speed or not depends on other and more factors, quite so.

    Stay within the envelope and figure out what feels best for you plane - and have fun!


  • Re: Another in flight adjustable question

    by » 5 weeks ago


    PETER - That was my thoughts.  I have read so many articles stating don't run below a certain RPM at WOT etc, but the ROTAX chart shows otherwise.

    If that was the case, wouldn't ROTAX state that.

    This topic has confused the crap out of me because there are so many different versions of what not to do, that it's impossible now to sort fact from fiction.


  • Re: Another in flight adjustable question

    by » 5 weeks ago


    At the end of the performance data table posted earlier, it refers to Service Letter SL-912-016 which somewhat confuses the situation. It has another graph in section 3.4.1 showing the maximum MAP for different fuel types.

    https://rotax-docs.secure.force.com/DocumentsSearch/sfc/servlet.shepherd/version/download/0681H00000FTeDYQA1?asPdf=false

    Later in the same document, in section 3.5.1 it states:

    Choose take off RPM at WOT according to the selected fuel (refer to section 3.4.1)

    and

    Choose RPM for continuous operation of engine at WOT according to the selected fuel (refer to section 3.4.1)

    I don't see how the graph in section 3.4.1 (attached image) gives you the respective RPM for take-off and continuous operation depending on the fuel type.

    So, at WOT, does the use of RON95 mean that take off and continuous RPM should be anything other than 5800 and 5500 respectively?

     

     

    29313_2_MAP-RPM-Fuel.jpg (You do not have access to download this file.)

  • Re: Another in flight adjustable question

    by » 4 weeks ago


    LIke I said RIchard, it's no imossible to really understand what is truth and what is not!  So confusing!

    I wish someone from ROTAX would just make it simple.


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