fbpx
Login

 

Jump to Forum..

912 ULS Oil Leak

in 912 / 914 Technical Questions 9 years ago

  • Re: 912 ULS Oil Leak

    by » 9 years ago

    WOT 5250-5300 rpm.
    On cruise I was flying on 5000.
    I don't know what was with previous owner, probably lower (I was changing prop pitch for higher rpm).
      
    Report

  • Re: 912 ULS Oil Leak

    by » 9 years ago

    I set RPM due to this what rotax want (so higher) but in aeroplane manual you can read:
    Neuform CR3 3 blade (1,75 m Ø)
    Pitch 27º @ 310mm from hub edge
    Full throttle ground static RPM 4700 rpm (prop = 1934 rpm)

    http://www.mainairflyingschool.co.uk/uploads/documents/POH%20C42%20Iss%2014.pdf


    Why aeroplane manual says to set full rpm to 4700?
      
    Report

  • Re: 912 ULS Oil Leak

    by » 9 years ago

    If your max WOT rpm in flat and level flight was only 5200-5300 this may have caused these cracks from over stressing the engine. The 912 series engine should be no less than 5500+ WOT. I prefer 5600-5650 for a ground adjustable prop. Kind of balances the overall flight and performance characteristics. The older crankcases approximately May-June 2006 and older were prone to cracking from over stressing the crankcase because owners over pitched their props.
    Aircraft MFG's get things wrong too. I have seen it many times. Some get the message right away and correct things and some don't.

    Rob,
    Do you think these cracks may have come from over pitching and stressing the case?

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

      
    Report

  • Re: 912 ULS Oil Leak

    by » 9 years ago

    I had 5200RPM WOT on the ground. I don't remember now what I had in the air but for sure more.
    Previously (before me) was for sure more loaded because it was made according to Comco manual.
      
    Report

  • Re: 912 ULS Oil Leak

    by » 3 years ago

    Hi Ron, I just lookeed at your post from 6 years ago. It seems I have exactly the same problem. Have you been able to fix yours? I have the (same kind of) leak on cylinder one and three? Any help would be much appreciated.

     

      
    Report
You do not have permissions to reply to this topic.
Related Topics
Title Category Replies
How to Remove Outlet Line from Turbo Oil Sump 912 / 914 Technical Questions 2
Need to find 912iS Fuel Filter General Tech Discussion 0
Need to find 912iS Fuel Filter General Tech Discussion 8
Blended 100LL/Unleaded Fuel & Oil Change Interval 912iS Technical Questions 2
pin cramp for ignition 912 912 / 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