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  • #1

    What causes this?

    Hi All. My first post so please be gentle with me. LOL

    I have a Trex 500 EFL Pro and very much a beginner, still at the hovering, gentle forward, backwards, sideways with the occasional very ropey spot turn thrown in. Early days yet but I have a strange out of balance oscillation that occurs every now and then.
    From the ground to the initial hover every thing is smooth as silk, but if a put a cyclic input in at anything other than a tiny amount, I get a "wobble" that seems to rotate with the disc until it settles down.
    Now I know that the blades are balanced. The initial hover is rock solid and the tracking (visually checked seems good)??
    Any ideas. Could it be something in the setup of the 3gx?
    Align Trex 500 EFL Pro
    Blade MCPx V2
    Tags: None
  • #2
    Hey.

    This sounds like an overall gain or lock gain slider being too high on the cyclic gyros. This will give a behaviour similar to what you describe where the models fuselage almost appears to be wobbling under the rotor disk due to the gyros inputting to much corrective commands. This is the same as what would happen to the tail rotor if the gain was set too high and the tail starts hunting/wagging.

    You're using a 3GX FBL controller, what firmware is it running at present?
    If you are running V1.1 or V1.2, then my posted settings files for the 3GX will work well on the Trex500 also. These may also require slight gain adjustments, but will work much better than the stock settings.
    .
    Ian Contessa
    Robbe SchluterUK / Midland Helicopters / Align



    Coolice Power Supplies
    Coolice Custom Built Charge Case's

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    • #3
      Whats your gains set to?
      NONE OF THE BELOW HELI'S ARE OWNED BY ME ANY MORE
      TT Raptor G4 + Vbar       | MCPX V1 + HP05 Brushless & All the upgrades | 130x Stock | Henseleit TDR 2013 +Vbar | 450L DOMINATOR 6S + Mini Kbar | Logo 550SX +Vbar Mini
      Proud wearer of the EGS award!

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      • #4
        Thanks for the quick reply guys.
        I did the build myself but the setup was done by the guy from the store and it all passed in a blur.
        Where and how do I check the gain? I guess I am running v2.0 as it was only setup a couple of weeks ago, but again,
        is there anyway to check?
        Align Trex 500 EFL Pro
        Blade MCPx V2

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        • #5
          There are two little white dials on the top f the unit. They should be around the 12 o'clock Ish position, maybe a little higher or lower depending on set up.

          Also check your blade grips rotate smoothly when you remove the pitch links. I had a bit of bobbling on mine caused by a slightly binding blade grip
          NONE OF THE BELOW HELI'S ARE OWNED BY ME ANY MORE
          TT Raptor G4 + Vbar           | MCPX V1 + HP05 Brushless & All the upgrades | 130x Stock | Henseleit TDR 2013 +Vbar | 450L DOMINATOR 6S + Mini Kbar | Logo 550SX +Vbar Mini
          Proud wearer of the EGS award!

          Comment

          • #6
            Hey.

            If you connect the 3GX to the pc and open the software, it will show you the currently installed firmware along the top of the interface.
            .
            Ian Contessa
            Robbe SchluterUK / Midland Helicopters / Align



            Coolice Power Supplies
            Coolice Custom Built Charge Case's

            Comment

            • #7
              Thanks both.
              I'll check that out.
              The gains on top of the unit are approx in the 12 o'clock and I'll connect up to the computer
              and check the version.
              Align Trex 500 EFL Pro
              Blade MCPx V2

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              • #8
                normally in the 3gx units i have setup the elevator needs less gain
                Santander Factory Team

                Proud wearer of 5 x EGS

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                • #9
                  Spot on guys, I dialed back the Elevator Gain to 11 o'clock position and now it's perfect. Thanks all.
                  Last edited by Cap Loz; 08-04-2012, 09:26 AM.
                  Align Trex 500 EFL Pro
                  Blade MCPx V2

                  Comment

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