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912 ULS 3000 RPM Vibration

in 912 / 914 Technical Questions 11 years ago

  • Re: 912 ULS 3000 RPM Vibration

    by » 11 years ago

    Tony: Thanks for the suggestion and pictures. I changed these tubes during my 500 hr rubber goods change, but I will change them again since it takes a small amount of time and I have extra tubing. So far, nothing has helped so perhaps this is it.

    Doug
      
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  • Re: 912 ULS 3000 RPM Vibration

    by » 11 years ago

    I'm having the same problem on a tacnam Bravo. Pretty bad vibration at around 4000 rpm. Carbs are good. It has a Sensenich g/a prop. It is the last resort. I'm pulling the prop and putting the wood on back on. I just keep reading these props are having more trouble.
      
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  • Re: 912 ULS 3000 RPM Vibration

    by » 11 years ago

    I use and sell a number of Sensenich props and have had no problem. Flight Design is using them along with other Light Sport aircraft Mfg's. if the blades track and the pitch is equal and you have done a dynamic balance on the prop then it isn't the prop and it is your engine. It could be a few things. It could be the rubber engine isolators, engine mount bolt torque, bad carb setup, poor gearbox shimming.

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

      
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  • Re: 912 ULS 3000 RPM Vibration

    by » 11 years ago

    Tony: I changed the vent tubes but did not see an improvement. It was worth a try but no luck.
      
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  • Re: 912 ULS 3000 RPM Vibration

    by » 11 years ago

    Roger: My vibration issue has been resolved, and was due to the gearbox. I installed new disc springs and re-shimmed the gearbox. The vibration at 3000 rpm is gone. I wanted to be sure I posted the resolution to my problem. My thanks to everyone for their help.
      
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