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New to the forum with a UH1-D 800 series

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  • #21
    Originally posted by Alpha View Post
    Astronome Is there a certain RPM range where the vibrations begin, or end?
    Hey Alpha! Long time no see!

    Comment


    • #22
      Originally posted by Alpha View Post
      Astronome Is there a certain RPM range where the vibrations begin, or end?
      Hi Alpha,

      Vibrations start gradually from 1000rpm

      Comment


      • #23
        Originally posted by sfcfury View Post
        I know in there older mechanics sets, the main shaft bearings were suspect as well, but that probably seems to have been mostly corrected. Perhaps just a bent main shaft?
        Hi sfc,

        Maybe, but I have the latest version of mechanics HSM800 (with the helicoid gears)

        Comment


        • #24
          Originally posted by Astronome View Post

          Hi sfc,

          Maybe, but I have the latest version of mechanics HSM800 (with the helicoid gears)
          Personally, I’d try a set of tests slowly removing components from the mechanics. First try removing the blades and running it up. If it’s still present, you can eliminate the blades as a possibility. Next, remove the head and run it up. If vibrations are still present, you can eliminate the heads as a cause. That should help narrow down the options.

          Beautiful Vario choppers by the way, that’s some excellent craftsmanship!

          Comment


          • #25
            Just thinking out loud…..are you sure your motor pole count is entered correctly in the ESC/FBL governor?

            Comment


            • #26
              Originally posted by F106DeltaDart View Post

              Personally, I’d try a set of tests slowly removing components from the mechanics. First try removing the blades and running it up. If it’s still present, you can eliminate the blades as a possibility. Next, remove the head and run it up. If vibrations are still present, you can eliminate the heads as a cause. That should help narrow down the options.

              Beautiful Vario choppers by the way, that’s some excellent craftsmanship!
              Hello F106DeltaDart
              That's exactly what I did.
              Balanced blades
              Verified Center of Gravity: Vibrations still present blades removed.
              Head removed: ditto

              Comment


              • #27
                Originally posted by PawPaw View Post
                Just thinking out loud…..are you sure your motor pole count is entered correctly in the ESC/FBL governor?
                Yes PawPAw

                The Jeti Box allows you to read the parameters in clear:
                - Rotor/motor ratio 1:13.8
                - Rotor rpm mini/max: 1160/1240rpm
                - Number of poles: 10 for the Hacker engine

                Comment


                • #28
                  If it’s a 10 pole motor, did you enter 5? It’s poles / 2 = factor.

                  Comment


                  • #29
                    Also, is you drive belt too tight or loose? YouTube has a good video on proper adjustment of the belt.

                    Comment


                    • #30
                      Originally posted by PawPaw View Post
                      If it’s a 10 pole motor, did you enter 5? It’s poles / 2 = factor.
                      PawPaw,
                      No in the Jeti ESC, it is the number of real poles that must be indicated, I ask JETI for validation.
                      I also checked with a tachymeter.
                      I'll give you a picture tomorrow (it is 9:30 pm in France)

                      Comment


                      • #31
                        Ok, I have no experience with Jeti…only Castle Creations, Hobbywing, and now Scorpion Tribunus which all require poles/2. I do know that setting up the wrong number in that category will induce heavy vibrations as I have experienced on one occasion.

                        Comment


                        • #32
                          Hi PawPaw,

                          Here some JetiBox screen:

                          Number of pole
                          Cliquez sur l'image pour la voir en taille réelle   Nom : 		IMG_5771_01.JPG  Affichages :	0  Taille :		143,2 Ko  ID : 			341766


                          Rotor gear
                          Cliquez sur l'image pour la voir en taille réelle   Nom : 		IMG_5772_01.JPG  Affichages :	0  Taille :		141,0 Ko  ID : 			341767

                          RPM max
                          Cliquez sur l'image pour la voir en taille réelle   Nom : 		IMG_5774_01.JPG  Affichages :	0  Taille :		141,0 Ko  ID : 			341768

                          RPM min
                          Cliquez sur l'image pour la voir en taille réelle   Nom : 		IMG_5775_01.JPG  Affichages :	0  Taille :		143,9 Ko  ID : 			341769

                          Current data motor running without blades

                          Battery voltage
                          R: motor power
                          Temperature ECS in C°
                          Current
                          RPM

                          Cliquez sur l'image pour la voir en taille réelle   Nom : 		IMG_5777_01.JPG  Affichages :	0  Taille :		141,9 Ko  ID : 			341770

                          Bests flights

                          Daniel

                          Comment


                          • #33
                            Ok. What motor are you using? Also, what are your PWM and timing settings?

                            Comment


                            • #34
                              Hi PawPaw,

                              My motor is an Hacker A50-12L
                              My ESC: Jeti Mezon 130 lite
                              PWM: 8khz
                              Timing 17°

                              Comment


                              • #35
                                The Hacker A50-12L V4 shows to be a 14 pole motor. Is yours an older version? Also lists timing at 20-25.

                                Comment


                                • #36
                                  I see 2 different specs for the same A50-12L V4. One shows 10 and the other shows 14. I suspect yours is 14 poles and the source of the vibration. Click image for larger version

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                                  Comment


                                  • #37
                                    I have this model Turnado V4
                                    Click image for larger version

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                                    • #38
                                      I see that. I also see 14 poles listed for another A50-12L V4. My suggestion would be to count the poles in your motor to be certain, due to the very strong possibility your vibration issue is due to an incorrect ESC pole number entry. I got that number wrong on a 600 heli build several years ago and the vibrations were dramatic.

                                      Comment


                                      • #39
                                        Hi PawPaw,

                                        Effectively, my motor is the "TURNADO serie" A50-12L V4 look HERE but not a "Standard" A50-12L V4 here which is a 14 poles for 6/8S battery.
                                        Thanks for clarifying that.

                                        Daniel

                                        Comment


                                        • #40
                                          On my 212 600, with the same tail drive (slightly smaller)
                                          The drive shafts to the tail rotor I have both aligned in a lathe and both were not perfectly straight
                                          I also placed a ball bearing on the short shaft and 2 bearings on the long shaft. I also secured the bearings of the 45 degree teeth on the gears, tail had no vibrations on 1st flight. See video made in my backyard , tail doesnt shake at all

                                          https://youtu.be/-qHvv6QN4Uo

                                          Comment

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