fbpx
Login

 

Jump to Forum..

Low max RPM

in 912 / 914 Technical Questions 13 years ago
Hello, my airplane develop only 5000 RPM in take off with a 912UL, I checked the carburetor and it is wide open with full throttle, then I believe that the cause is the propeller pitch. Is it a problem ?

Ricardo Urio

  • Re: Low max RPM

    by » 13 years ago

    If your prop pitch is too coarse, even by a couple of degrees, your engine will not reach max recommended rpm. Why would you think that that was the problem unless you have recently changed the pitch Ricardo?
    John
      
    Report

  • Re: Low max RPM

    by » 13 years ago

    Hello John, I bought this airplane some weeks ago, but never could see the real RPM because the original Rotax tachometer, #1211009750A, has unsolveable stability problem, then I installed a digital tachometer and could see that the engine reach only 5000 RPM. I didn´t change the prop pitch, it is as I bought. My consern is if this condition will put the engine in a load or condition not good for it working. I have no problem with power at take off and climbing speed, and the fuel consumption is very good. Thanks :)
    Ricardo
      
    Report

  • Re: Low max RPM

    by » 13 years ago

    A quick look in the POH handbook will give you all the info on max, cruise and idle rpm Ricardo, and also the degrees of set for the prop blades. The Rotax engine is designed to work efficiently within narrow parameters; when purchasing a used engine the parameters need to be checked. Sometimes people tweek engines without really knowing the consequences.

    John
      
    Report

  • Re: Low max RPM

    by » 13 years ago

    Where I can found the POH handbook ? Is it http://www.rotax-aircraft-engines.com/portaldata/5/dokus/d04997.pdf ?

    Ricardo
      
    Report

  • Re: Low max RPM

    by » 13 years ago

    That looks like it Ricardo; it says Take off rpm 5800. Looking for pitch setting.
    John
    Thank you said by: Ricardo Urio
      
    Report
You do not have permissions to reply to this topic.
Related Topics
Title Category Replies
915is > 250 RPM drop on lane check 915iS Technical Questions 1
Max takeoff fuel consumption 915iS Technical Questions 2
RPM issue, first start, new engine 912 / 914 Technical Questions 8
914 throttle lag, mag rpm drop 912 / 914 Technical Questions 4
High flow radiator? 912 / 914 Technical Questions 3
Follow Us

Recent Videos

Safety First!

 

To receive critical-to-safety information on your ROTAX Engine, please subscribe to
ROTAX-OWNER.COM

ROTALK News



ROTALK NEWS Episode 5
Rotax-powered Sling aircraft from The Aircraft Factory, the AVMAP Navigation and engine monitoring system, and the Rotax powered Tucano Experimental and Light-Sport Aircraft.



ROTALK NEWS Episode 4
ROTAX's 915iS-powered Aquila A211 test aircraft, the Scheibe SF-25C Falke (first-ever 912-equipped aircraft!) and ROTAX factory in Gunskirchen, Austria.


ROTALK NEWS Episode 3
Michael Smith's Rotax-Powered Searey Circumnavigation, the amazing Rotax-Powered Lockwood Aircam and Anthony Caere's chimpanzee rescue operations.

Prize Giveaway!


SUBSCRIBE NOW
to automatically enter this years draw!

Login