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  • #1

    tight blade grips.........

    hello all,

    I managed to crash my Fury 50 last friday, I managed to get all the parts i need to repair it from Rotors & Motors...........Not the cheapest to be honest but i got them and Dave was extremely helpful. Anyway.........
    I have put it all back together....... Main shaft, Axel, New main blades, and a couple of links.

    I went out to the field and the heli wobbles quite allot on start up and it seems to have quite allot of vibration. I also put a gy401 on it and the tail seems to twitch randomly every now and then.

    I checked everything last night and i found that the blade grips feel a bit tight to move, which in turn make the flybar a bit tight too........why is this happening?

    I know i have given a load of issues but they might be related in some way..........

    Many thanks Lee
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  • #2
    Hi Lee,

    It's been a while since i've had a tinker with a Fury but i have had the Fury Extreme and Tempest's in the past and they are excellent machines.

    It might be worth checking your assembly to make sure everything is installed correctly, thrust races in the right way and nothing missing or check that everything is seating corrently etc.. I've seen a few instances where bearings have not seated correctly and will make the grips to bind up.

    Also might be worth while to check the main hub assembly, check that the dampers are installed the correct way and all the shims are correct etc.

    The gyro will be affected by excessive vibration, so this should'nt be a problem once the machines vibration issue is sorted.
    Thanks!
    Rossco
    sigpic
    Synergy N7 / Synergy E7SE / Synergy E5
    Synergy R/C Helicopters / Rail Blades / Fast-Lad Performance Flight Team
    Equipment for Sale:

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    • #3
      Hi rossco,

      Well funny you say that............. the races are a tricky one.. i dont get what they mean about the "cupped" side of the ball race! I could have them in the wrong way round! ooooooops! would that cause it to wobble and shake??????/

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      • #4
        If you look at a thrust bearing it is made of 3 different parts. 2 grooved washers with different inner diameters and a ball race. If you look at a ball race on one side you can see the ball bearings just poking through the race, the other side you can see almost all of the balls, this would be the cupped side. This should face in towards the main shaft, this way the grease is held in the bearing better. More important is that you get the grooved washers in the correct way, the one with the larger internal diameter goes in the blade grip first, then the race then the other smaller internal diameter washer, obvious but make sure the grooves face the race. If you get that wrong it can cause locking. Check that you have not got the washers the wrong way round or even that you have not used two small internal diameter washers in one grip and the two large in the other.
        Mikes Place - Home of the golden dump.

        Sponsored by Elite Models.
        http://www.elitemodelsonline.co.uk/

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        • #5
          Hi,

          The 'Cupped' side of the race is the side where the inner race cage will run, A Thrust bearing has an 'Inner' and an 'Outer' race.

          When installing the inner race will have a slightly larger ID (Internal Diameter) and a slightly larger OD (Outside Diameter) this will go to the side of the blade grip closest the hub and the outer race will have a slightly smaller ID (Internal Diameter) and a slightly smaller OD (Outside Diameter).

          The picture below shows how the center bearing cage runs within the cupped races.
          225px-Thrust-ball-bearing_din711_ex.jpg
          What a Thrust Bearing does is it takes the load from the centrifugal forces of the main rotor and allow everything the operate smoothly, if you did'nt have thrust races the standard radial bearings in the blade grips would'nt be able to take the loads and fail.

          Hope this helps
          Thanks!
          Rossco
          sigpic
          Synergy N7 / Synergy E7SE / Synergy E5
          Synergy R/C Helicopters / Rail Blades / Fast-Lad Performance Flight Team
          Equipment for Sale:

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          • #6
            Right, That is much clearer!!! cheers, will take it apart tonight and see which way i put them in! 10 to 1 i did it the wrong way!!!!!! lol

            thanks for the excellent explanation, but no one has said if this will cause the problems im having...............

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            • #7
              Having the thrust races in the wrong way can give you problems like you are experiencing, if the bearings are binding up inside or they have been damaged from the crash this can also be the cause of the tightness of the grips and the vibration issues.
              Thanks!
              Rossco
              sigpic
              Synergy N7 / Synergy E7SE / Synergy E5
              Synergy R/C Helicopters / Rail Blades / Fast-Lad Performance Flight Team
              Equipment for Sale:

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              • #8
                i think they may just be in the wrong way round, they looked ok when i had it all apart.......no obvious damage(that i could see)

                Just a quick one on the gyro, the "twitch" is very intermittent and its almost like its a electrical twitch more than a mechanical one. if that makes sense.

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                • #9
                  If it's a Futaba GY401 then check it's setup and connections, they have a two setting switch on the gyro itself for Standard and Digital Servo support just make sure its set for your type of servo.

                  Depending on the level of vibration your getting it could simply be that the vibration is just too much for the gyro and every so often it will 'spazz' out (That's a Rossco Technical Term Right there! ) It could also be that the gyro gain is slightly too high but i would sort out your vibration problem first before chasing a gyro gremlin as you may find out its the same gremlin!
                  Thanks!
                  Rossco
                  sigpic
                  Synergy N7 / Synergy E7SE / Synergy E5
                  Synergy R/C Helicopters / Rail Blades / Fast-Lad Performance Flight Team
                  Equipment for Sale:

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                  • #10
                    True!! Good point!

                    I have taken the "new Axel shaft" and just for my curiosity rolled it on a piece of glass............it seems to be slightly bent????????? it was brand new in the packaging, is this possible??

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                    • #11
                      Axel shaft?

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                      • #12
                        I'm guessing the "axel shaft" would be the feathering spindle. If it's bent it is no good, it would cause either vibrations or blades out of track or both.
                        Mikes Place - Home of the golden dump.

                        Sponsored by Elite Models.
                        http://www.elitemodelsonline.co.uk/

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                        • #13
                          Ye x-cell call it a "axel" but it's the feathering shaft. The strange thing is it's brand new out the bag!!! Weird!!!

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                          • #14
                            Maybe if could spell it would make sense! Axel = axle

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                            • #15
                              ok, so Dave at Motors & Rotors is sending out a new "Axle" will update when its all back together again and flying.......... thanks for all the advice guys!

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