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  • Re: RPM Drop in 912ULS

    by » one month ago


    Assuming adequate fuel return lines fitted, vapour lock would be removed/corrected by switching on the Boost pump😈


  • Re: RPM Drop in 912ULS

    by » one month ago


    Thank you, Harold!  I have been using Mogas (98 Octane from Texaco); it´s the fuel I have used for 700 hours with no problem.  Although 100LL is available at my home airport, I stay away from it because of the lead buildup in the engine, which increases maintenance requirements.  Vapor lock my indeed produce the symptom I have, but is very unlikely given the temperatures we operate.   Most of the operations of this Aircam and many other Rotax are near this Airport.  I will report back when I find something else.  Thanks again!


  • Re: RPM Drop in 912ULS

    by » one month ago


    Thanks @Jeff, two events occurred at high altitude and the first one at 5000".  I have always been using Mogas as per Rotax recommendation.  Thanks again!


  • Re: RPM Drop in 912ULS

    by » one month ago


    Francisco,

    I don’t know much about Mogas in Colombia, but here in the USA this is the time of year when automotive fuel in most states changes from summer gas to winter gas. Summer gas has a vapor pressure of about 7 PSI (similar to Avgas) and winter gas can be as high as 13.  So this is the time (here) to be careful because temperatures can still be warm and make using Winter fuel more risky.  I’m with Harold on this, run one full tank of Avgas and see if the problem is resolved. 


  • Re: RPM Drop in 912ULS

    by » one month ago


    Francisco is driving 912ULS (carburettors). Unless there is something very peculiar in his fuel reticulation system (design), in-flight fuel vaporisation, is  unlikly.😈


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