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Throttle creep and return springs.

in General Tech Discussion 12 years ago

  • Re: Throttle creep and return springs.

    by » 6 years ago

    "But ideally I'd like to find a way to have, in broken cable scenario, it drop to, say, somewhere between 5000 and 5400.
    Any ideas how to kludge or engineer that?"

    An inflight adjustable variable pitch propeller would allow you to coarse the blade pitch angle and decrease rpm to the desired range.
      
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  • Re: Throttle creep and return springs.

    by » 6 years ago

    That would be hard to do using cables.
    If you re-engineered the throttle linkages to rigid Push-Pull tubes you could have the springs open it up to 90% and then use the throttle to Push it the rest of the way when needed,

    But...
    There is no reason to go through all the effort.
    Cables do not break without warning.
    Proper inspections will reveal the problem long before it ever becomes an actual problem.
    There is a 99% chance that you will never see this failure in your lifetime.

    Coarsing the prop to load the engine down is way worse than running at 5800 for an hour. Bad Idea!
    If the throttle goes wide open, just climb.
    Once you gain a few thousand feet, 5500rpm will no longer be reachable at altitude and WOT will be less than continuous cruise power.
    You can fly till the tank goes dry under these conditions.
    Once you arrive over the airport at 5-10 times the pattern altitude, declare an emergency, kill the ignitions and make a dead stick landing.
    No-one is going to get upset.

    No matter what, it is going to be a dead stick landing, followed by a closed runway until you get out and physically push the plane clear of the runway.
    There is not going to be any powered taxiing to the ramp involved.

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

      
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  • Re: Throttle creep and return springs.

    by » 6 years ago

    Why do you want it to only go between 5K - 5.4K rpm? If you're above 5500, but below 5800 fly to where ever you want.

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

      
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