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Thread: New trim lever

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  1. #1

    Join Date
    Dec 2019
    Location
    Idaho
    Posts
    118

    Default Re: New trim lever

    20 seconds to adjust trim sounds like a really long time. Could there be something wrong with the trim control motor/mechanism? I'd
    rather get that working than the solution you built. Anything that can get in the way of the stick seems like an accident waiting to
    happen.
    Building SS7
    915iS
    Garmin G3x

  2. #2
    Senior Member 109JB's Avatar
    Join Date
    Mar 2019
    Location
    Morris, IL
    Posts
    491

    Default Re: New trim lever

    Yank the electric servo and run a 1/4 turn locking push-pull cable to the tab. That is how my Sonerai is rigged and going from neutral to either stop is as fast as you can push or pull the cable. It works very smoothly and once you get used to it you just know where it needs to be for the most common flight configurations.
    John Brannen
    Morris, IL
    Sonerai IIL (Single Seat)
    Kitfox 3/4 1050 - Rotax 582 (Back Flying and sold)
    Kitfox IV 1050 - Rotax 582 (sold)
    Kitfox IV 1200 Speedster - Rotax 912 UL (rebuilt and now flying)
    Piper Twin Comanche (Sold)
    Glasair 1 FT (Waiting to start)

  3. #3
    Senior Member
    Join Date
    Jun 2008
    Location
    wales,ny
    Posts
    715

    Default Re: New trim lever

    Quote Originally Posted by VictorV View Post
    20 seconds to adjust trim sounds like a really long time. Could there be something wrong with the trim control motor/mechanism? I'd
    rather get that working than the solution you built. Anything that can get in the way of the stick seems like an accident waiting to
    happen.
    Jim , I gotta agree with Victor here, too much going on on your what should be your primary flight control , your control stick. Some other solution with a secondary control not on the stick should be your answer. Glad you and the airplane survived this "learning experience" unscathed Bruce N199CL

  4. #4
    Senior Member
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    Apr 2009
    Location
    Chisholm Mn
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    1,578

    Default Re: New trim lever

    Thanks for the replys everyone. As far as a trim cable, I have one on my Avid Flyer, and had the cable break off once. It would bend a bit each time it was used and eventually got brittle and cracked. A trim tab will flap up and down if not connected, and that was an exciting experience as well. Talk about a stick shaker. I really do like the trim adjust I made, but should have put stops on it right away.

  5. #5
    Senior Member 109JB's Avatar
    Join Date
    Mar 2019
    Location
    Morris, IL
    Posts
    491

    Default Re: New trim lever

    If flexing broke the cable, one of 2 things happened. First it was a cheap cable. Second the sheath was attached too close to the bellcrank on the trim tab. In either case it was a design flaw, not a cable problem. On my Sonerai the cable wire is 0.085" diameter, not the 1/16" most cheaper cables come with. You can even get thicker than that. I got mine at McMaster Carr. Push-pull cables are used for primary controls on many ultralights, are used for the controls on the Velocity aircraft, and are used to retract landing gear on some Pipers. A properly designed and maintained push pull cable system will not break.
    John Brannen
    Morris, IL
    Sonerai IIL (Single Seat)
    Kitfox 3/4 1050 - Rotax 582 (Back Flying and sold)
    Kitfox IV 1050 - Rotax 582 (sold)
    Kitfox IV 1200 Speedster - Rotax 912 UL (rebuilt and now flying)
    Piper Twin Comanche (Sold)
    Glasair 1 FT (Waiting to start)

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