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  • #1

    Unusual Failure

    Hi Everyone,

    Was happily flying my OS91HZ-PS equipped Srimok when the revs rose rapidly and the engine quit. Autoed in safely and upon checking the regulator was on the floor (retained by the fuel tubing). The main needle was completely missing!!

    Not sure if the engine vibration cause the needle to loosen but I must confess to never having checked the tightness of the needle in the engine casing - lesson learnt!.

    Does anyone know the best place to get a replacment Main needle valve assy (Pt No OS 29181900) as its for the PS it seems to be a difficult one to locate. (are any of the other OS main needles compatible?)

    Also in the exploded view the regulator is held onto the casing with washers either side of the reg. The washers are not listed as seperate parts, do you think that these would be supplied with the needle assembly?

    Cheers,

    Gav
    Tags: None
  • #2
    Meant to say that I had a previously flown the heli 40 times prior to the failure.

    Ta,

    Gav

    Comment

    • #3
      I had one come loose on an OS37 a few years back but thankfully it didn't come right out. Nearly but not quite.
      JR Vibe Fifty fb (YS56)

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      • #4
        you can try just engines
        but they will order it from ripofmax
        don't expect it to come this side of xmas
        this wil be ripmax not just engines

        the other one to try is bob at skyline
        Hirobo Turbulence D3
        a bunch of bls servo's and a 701 gyro
        Powered by an OS91 hz and a MP2
        Winner of the LHC Scale Cup 2011
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        2012 LHC Scale Cup Judge
        member of save the flybar foundation
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        sigpic

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        • #5
          At least you got her down safely, well done on that.
          Paul.
          2 x TDR II Bavarian Demon AXON, Pyro Comp 850/50, Kosmik cool 200, Futaba BLS, 15s
          TDR Bavarian Demon 3X, Pyro Comp 750/56, Kosmik cool, 14s, Savox: SB-2282SG, SB-2283SG Tail
          TD          R           Bavarian Demon 3SX, Pyro 750/56 comp Kosmik Cool 200, Savox,
          Logo 600SE, Bavarian Demon 3SX, Pyro700/52, 80HV,
          Logo 480 xxtreme, Bavarian Demon 3SX, Scorpion, Savox, YGE,

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          • #6
            Cheers for the info, will give them a try......as it's a little unusual
            I am expecting a bit of a wait......

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            • #7
              If you're sure on the part number then readyheli list that as 91 sz-hyper ..so standard 91 main needle valve system would fit?
              I might even have one on the carb of the align 91 engine I fried last year?..

              29181900 O.S. Needle Valve Assembly For The 91SZ-H Hyper
              PGK
              450Pro Clone fb, Trex500 fbl beastx, Trex 600N fbl beastx, Trex700N fbl msh brain, Spectra G Hanson 26 3dmax fb, Blitz Avro fb...Futaba 8FG

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              • #8
                Am confident in the part number as this comes from the exploded diagram of the carb in the manual.

                Cheers for the ready heli heads up, will have a look and see if the needles are compatible.(crosses fingers)

                Ta,

                Gav

                Comment

                • #9
                  I have a spare ( used ) if that's any help?? PM me if you're interested

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