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Hello dear forum,

I am doing flight training on an aircraft which installed with Rotax 912S engine with an Airbox.

I'm trying to understand what is the purpose of this Airbox, advenatages and how it works. I couldn't find enough detailed information online.

If anyone can spread some more light for me on this topic I would be very glad!

 

Thanks,

Bogdan

  • Re: Rotax 912S Airbox purpose

    by » 4 weeks ago


    What Aircraft?
    An Airbox ...
    • Simplifies sourcing the air for both carburettors.
    • Depending on the installation, the air temperature and/or pressure within the cowling may be significantly different on each side.
    • It makes it easy to run a single intake hose to a point on the aircraft where prefered ambient air can be optained.
    • It makes is simpler to provide the same carb heat air to each carburetor.
    - - -
    It has be argued by many that the engine would have been better served if it was originally designed with a single carb, or even dual carb's, feeding a singe intake manifold supplying all 4 cylinders.
    Overall, the airbox removes SOME of the difficulties created by having two independent induction systems.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Bogdan

  • Re: Rotax 912S Airbox purpose

    by » 4 weeks ago


    Thanks Bill!

    I'm doing training on Tecnam 2006 and Tecnam 2008.

    Both are installed with Rotax 912S with airbox.

    So each engine of Rotax has 2 carburetors for the total 4 cylinders?

     

    And I also understood that somehow the airbox is raising the air temperature and thus decreasing the possibility of carb icing. Does it make sense? If so, can you tell me some details how does the air temperature increases in the airbox please?

     

    Thanks


  • Re: Rotax 912S Airbox purpose

    by » 4 weeks ago


    Both of those aircraft have Manual Carb Heat.
    The carb heat air is traditionally being taken from a shroud surrounding the exhaust system to capture the wasted heat produced. 

    For specific details about the construction and plan form of the engine, I suggest that you look over the Installation Manual and/or the Operators Manual at a minimum.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Bogdan

  • Re: Rotax 912S Airbox purpose

    by » 4 weeks ago


    Thanks again, Bill.

    I indeed reviewed the OM of our engine before and couldn't find too much information about the airbox specifically, using the same manual as the link you provided here. I also reviewed the installation link now, which provided a bit information about the structure layout of the airbox.

    Yet now I'm confused rather the 912s engine has 2 carburators for the total 4 cylinders or 1 carburator.

    Because the airbox layout seems to have 2 outlet necks.

     

    Bogdan


  • Re: Rotax 912S Airbox purpose

    by » 4 weeks ago


    Yes, each engine has two carburetors, feeding two cylinders each.  You should really actually read the manuals that Bill suggested...


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