Just rebuilt the carburetors and am having trouble getting it to idle.  I now have the wings off and the fuselage in the garage.  Can I run the unit without the prop being on the plane until I get it running better?

The engine is not sitting level as the t-0bird two was made from a trick to a tail dragger,  How important is it that the engine is level while tuning?

Thanks for any help!

Newbie on the block.  



    by » 5 months ago

    I would not run the engine without a prop. When regular GA engine shops run newly overhauled engines, they do it with a short, fat propellor usually refered to as a "club."  I can't explain the mechanics for you, but maybe someone will come along shortly who can. Maybe it's ok with a ROTAX, but I wouldn't risk it.



    by » 5 months ago

    Do not run the engine without a propeller.
    The idle will be unstable without the flywheel effect of the prop. 
    Without the air load or the momentum of the prop, you risk over reving the engine a split second after cracking the throttle off of idle.
    It will rev up even faster than an unloaded motorcycle engine and overheat quickly without the cooling air flow.

    Aircraft engine do not have or need the extra weight of a flywheel to smooth out the power pulses, the propeller serves that purpose.
    Engine test stands will use a "Club" prop for the mass and load while minimizing the dangers of a full size prop.
    The cooling airflow is often provided by separate electric blowers.

    Be extra carefull,  Propellers can KILL!

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

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