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  1. #1

    Join Date
    Jun 2009
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    OS 55AX Noisy

    When flying aroud half to quarter throttle i get a noise that sounds like lots of knocks. Some guys say it sounds as if it detonating but the noise is normal. from another post i read was wondering if the same applied http://www.rcuniverse.com/forum/fb.asp?m=9831530

  2. #2
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    RE: OS 55AX Noisy

    The LA-series of engines do not have crankshafts supported by ball bearings. The AX-series of engines, do. You cannot get noise from the same source. The crank of an AX-series engine should not move around. If it does, then the bearings could be bad. Usually, though, in mid-to-low throttle settings, you get additional exhaust noise caused by unburned fuel exiting the engine and burning in the exhaust port and/or muffler. It will vary, depending upon the exhaust system, fuel used, and propeller. It's common on larger engines, but not unheard of with engines as small as the .55.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com


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