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RevCo Hard One 0.5m Pinion Gear 3.17mm Meshing problem. Odd?

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  • RevCo Hard One 0.5m Pinion Gear 3.17mm Meshing problem. Odd?

    Alright all,
    Anybody used the RevCo Hard One 0.5m Pinion Gear on their 450 sized bird?
    I figured you cant have too much power and bought a Scorp 2221-6 for my 450. After installing it and the above pinion it seems to be chewing the main gear to powder.
    I currently have and have had quite a few helis, I know there is a first time for everything but I'm pretty sure it's meshed correctly and I've never has a mesh related issue before afaik.
    I tested the mesh right around the main gear, just as I've done many times before but with this combo it gets to a certain (seemingly random) point and the pinion rolls over the top of the teeth of the main gear and a crunching resistance can be felt. This only happens when the main gear is turned by hand, if the motor is turned by hand instead, it does not happen.
    When the bird is flown, the gear mesh sounds noticeably nasty in the air and after only a few minutes I brought it back home to find powdered maingear all over the motor mount.

    My suspicion is that either the 9 tooth pinion is dimentionally too small with too big a gaps between the teeth (imagine for the sake of clarity what a 4 tooth would look like) or the teeth are the wrong shape for the STD main gear.

    The pinion is shouldered and I've shimmed the motor on the mount so that only the parallel faces of the 2 gears meet, it's not the shoulder mullering my main gear.

    Any ideas?
    D
    .......unless otherwise stated, all opinions are my own.

  • #2
    Originally posted by maddog7 View Post
    Alright all,
    Anybody used the RevCo Hard One 0.5m Pinion Gear on their 450 sized bird?
    I figured you cant have too much power and bought a Scorp 2221-6 for my 450. After installing it and the above pinion it seems to be chewing the main gear to powder.
    I currently have and have had quite a few helis, I know there is a first time for everything but I'm pretty sure it's meshed correctly and I've never has a mesh related issue before afaik.
    I tested the mesh right around the main gear, just as I've done many times before but with this combo it gets to a certain (seemingly random) point and the pinion rolls over the top of the teeth of the main gear and a crunching resistance can be felt. This only happens when the main gear is turned by hand, if the motor is turned by hand instead, it does not happen.
    When the bird is flown, the gear mesh sounds noticeably nasty in the air and after only a few minutes I brought it back home to find powdered maingear all over the motor mount.

    My suspicion is that either the 9 tooth pinion is dimentionally too small with too big a gaps between the teeth (imagine for the sake of clarity what a 4 tooth would look like) or the teeth are the wrong shape for the STD main gear.

    The pinion is shouldered and I've shimmed the motor on the mount so that only the parallel faces of the 2 gears meet, it's not the shoulder mullering my main gear.

    Any ideas?
    D
    Try moving the pinion a little bit lower towards the motor just enough for the pinion to ride just higher than the main gear. Maybe the angle meets the main gear from the pinion creating the dust and sound problems. Mesh it using the paper method and hold it as tightly against the main gear with the paper sandwich in between.

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    Julius

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