Roban - World Class Scale Helicopters

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  • #41
    Originally posted by Astronome View Post

    Hello F106DeltaDart
    That's exactly what I did.
    Balanced blades
    Verified Center of Gravity: Vibrations still present blades removed.
    Head removed: ditto
    Well at this point, if you still that much vibration with the head off... either one of the torque drive shafts is caddy wompus, or just the main shaft is bent?

    Comment


    • #42
      Yes sfcfury, that's what I think too, but 5/100th of a millimeter is perhaps normal for machining the rotor shaft.

      Don't forget to pick me up if my English is too bad

      Daniel

      Comment


      • #43
        Originally posted by Astronome View Post
        Yes sfcfury, that's what I think too, but 5/100th of a millimeter is perhaps normal for machining the rotor shaft.

        Don't forget to pick me up if my English is too bad

        Daniel
        Did you try it with head on but no tail shafts or tail blades or anything else hooked up??? Can you get us a video of the vibration??

        Comment


        • #44
          Hello DC,

          No, but I found where the great vibrations came from.
          A big difference of pitch between the 2 blades because a problem of one my 2 Digital Pitch Gauge.
          3 degree of difference

          Comment


          • #45
            Originally posted by Astronome View Post
            Hello DC,

            No, but I found where the great vibrations came from.
            A big difference of pitch between the 2 blades because a problem of one my 2 Digital Pitch Gauge.
            3 degree of difference
            Yep, that's the problem, don't forget this and I think a few people don't know this, you need to use a flat edged pitch gauge for the stock flat botton Roban blades, you get a true reading when the gauge is flat against the blade.

            Comment


            • #46
              Yes DC,

              but we must not forget that even after more than 30 years of model making we still make beginner mistakes.

              I really suck. Click image for larger version

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              • #47
                Originally posted by Astronome View Post
                Yes DC,

                but we must not forget that even after more than 30 years of model making we still make beginner mistakes.

                I really suck. Click image for larger version

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                Yes sir, you got that one right, sometimes I'm like, why did I not check this or that first, we all do it......​​​​​​

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                • #48
                  Yes I agree

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                  • #49
                    It definitely happens to us all! So getting the blade pitch corrected- did that solve the issue?

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                    • #50
                      Yes sfcfury

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                      • #51
                        Originally posted by Astronome View Post

                        Hello F106DeltaDart
                        That's exactly what I did.
                        Balanced blades
                        Verified Center of Gravity: Vibrations still present blades removed.
                        Head removed: ditto
                        I’m confused. How did blade angle fix vibrations that were present when the blades were removed and when the head was off?

                        Comment


                        • #52
                          Hello PawPAw,

                          Without the blades there were still some vibrations, but I think it was normal.
                          I tightened the belt, there is now less vibration

                          Comment


                          • #53
                            Hi,
                            After the tests of the mechanics alone, I installed this one in the fuselage.
                            8.4 kg on the scale, without model accessories.

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                            Attached Files

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                            • #54
                              Originally posted by Astronome View Post
                              Hi,
                              After the tests of the mechanics alone, I installed this one in the fuselage.
                              8.4 kg on the scale, without model accessories.

                              Click image for larger version

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                              Looks awesome and yes you will be up over 20lbs when your done with it, I was worried about the weight on all the ones I have owned, not an issue when your flying them, makes it very scale........

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                              • #55
                                It's true DC, my old UH-1D weighed 23kg (50lbs) and the flight is totally different.

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                                • #56
                                  Looking good!

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                                  • #57
                                    What are you using for the tail servo horn?

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                                    • #58
                                      Hi sfcfury,
                                      I using a SAVOX DIGITAL SC-1258TG 12kg-0.08s for the tail
                                      and 3 SAVOX DIGITAL SA-1256TG 20Kg.cm/6v for the head.

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                                      • #59
                                        Well the actual servo horn is what I meant- it looks like you flipped the tail over?

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                                        • #60
                                          Yes I installed the tail rotor on the left side (like the real helicopter).
                                          With part VARIO 97/20
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                                          There is also the spare part ROBAN:
                                          https://www.motionrc.eu/products/rob...bn-678-052-set

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