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Scope Weight Effect On Springers

Discussion in 'Anything Airgun Related' started by Pete2, Jun 30, 2020.

  1. Pete2

    Pete2 Normal fella - allegedly

    Likes Received:
    Random thought time.

    Been thinking about scopes and springers.
    I have a recently acquired TX200 which I believe has a rotating piston.
    Does putting a larger scope on high mounts (as an example) emphasis the movement as the piston rotates? Pull the trigger, will the higher weight cause a twist to the side if you compare it to a small scope on low mounts?
  2. td_boy

    td_boy Donator

    Likes Received:
    I would of thought the greater mass would provide a greater resistance to any torque generated by any drag generated by piston or spring rotation.
    But I would have thought any torque imparted would be minimal in the first place.
  3. Geezer

    Geezer Posting Addict

    Likes Received:
    I like smaller scopes on springers, for reasons of handling, weight, and looks.

    But some research I read a while ago by Jim Tyler suggested that bigger (ie heavier) scopes do damp down spring surge and reduce hold sensitivity/increase accuracy. Which makes sense.

    I guess if I’m adding weight to a springer, I’d rather do it in the stock or through a muzzle weight than a big scope with an inferior cheek weld.
  4. Chouchin66

    Chouchin66 Keyboard Hero

    Likes Received:
    California USA
    On a non - rotating piston gun, I would think any torque would be multiplied by the heavier/ higher scope( inertia), rotating piston , not so much. The lower a scope can be mounted though , is always better... Cant won't be accentuated as much/ lower center of gravity & like that.

    TORNADOS7 and Pleides like this.

    TORNADOS7 Top Poster

    Likes Received:
    The idea of the rotating piston is to help "minimise" the torsional effect that the spring has as the rifle fires so high, low, medium mounts should make no difference, mounts should be selected to provide you with the most consistent and repeatable head/eye position possible...

    Some target shooters prefer high mounts as it aids with hold over/under (or something along those lines anyway) as for "me" I prefer my scopes to be mounted as low as possible to enable a solid/consistent connection between the stock and my cheek but I am a hunter and not a target shooter...
    Pete2, robs5230 and Chouchin66 like this.
  6. robs5230

    robs5230 Oversprung

    Likes Received:
    bideford devon
    As above with the benefit of the rotating piston.

    For me, scope weight is simply additional weight and not a feature I desire in a springer of any make.

    I much prefer to soften the shot cycle by tuning rather than add weight.
    TORNADOS7 and Guloluseus like this.
  7. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

    Likes Received:
    The torsional reaction forces at the rifle and piston as a result of the spring uncoiling will be equal, the angular acceleration in each proportional to their radii of gyration and effective mass. Both are far larger for the rifle so it will be subject to far less angular displacement than the piston; to the extent that I'd consider it negligeable (has anyone noticed their TX rotating during the firing cycle or observed this to me a more pronounced phonomena in this rifle than in those with non-rotating pistons that react this force internally like the HW unerlevers?).

    To answer the question directly adding scope mass or placing this mass further from the centreline of the spring will increase the systems resistance to angular displacement during firing, but as above this seems so minimal to start with that in real world terms it's not worth worrying about.
    Pete2 and 1260engineer like this.
  8. Wofty

    Wofty 'This is the way'

    Likes Received:
    Galaxy rim and occasionally Wiltshire
    I use fecking hooge scopes for BR on my springers.
    If I don't strap em down I flip over!!!
    Pete2 and Chouchin66 like this.
  9. 1260engineer

    1260engineer Busy Member

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    you do realise that went right over there heads :claping::claping::laff:
    cloverleaf likes this.
  10. Roger Archbold

    Roger Archbold Engaging Member

    Likes Received:
    Hampton, middlesex
    I found with springers, anything, either added or taken away can change the poi, even adding a torch, as I found out many years ago on my 80, which was one of my reasons for getting into PCPs in the first place, but a bit of weight can certainly calm a lively springer down

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