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Rapid Shot Count

Discussion in 'Technical' started by danfullwood, Sep 14, 2019.

  1. danfullwood

    danfullwood Active Member

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    I think my Rapid is not running as efficiently as it could be, anyone any idea what might cause this?

    Recently had it serviced and the leak I had is sorted but now I feel as if I’m only getting 100 shots or so 200 bar down to 100.

    Haven’t done a proper test but I know for sure it’s not the 400 people say you should expect.

    It is a 2010 mk2 12 ft.lb in .22

    Any ideas would be helpful!

    Thanks,

    Dan


    .
     
  2. sharpsman

    sharpsman Posting Addict

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    with a 400cc bottle you should be getting close to 300 shots , sounds like you have a leak or it has not been set up rite
     
  3. buffy vampire slayer

    buffy vampire slayer Keyboard Hero

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    i get 80 plus with mine running at mid 30's.
    a .22 sub 12 should be doing near enough 400
     
  4. danfullwood

    danfullwood Active Member

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    Hmm. I need to confirm the fault really. It was properly set up by Kev G and I've just checked for leaks. Didn't find anything.

    Is there potentially something wrong with a part?

    Thinking of getting a quick fill and gauge kit too. Preferably one that doesn't stick out too far. I like the ones that replace the reg and do a v type cut out. I'm just too scared to cut the stock myself.

    Dan

    .
     
  5. sharpsman

    sharpsman Posting Addict

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    Kev G knows his stuff and would have set it up correctly, dr bob supplies a quick fill with gauge it moves the bottle forward about 12mm but the stock will need drilling to fit one , I have one on mine and it's brilliant , no messing on unscrewing bottles and easier to keep an eye on pressure.
     
    metalman likes this.
  6. keithy

    keithy Posting Addict

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    Check your bottle itself isnt leaking where the valve screws into it. Once the bottle is screwed to the gun the valve in the bottle is always open so the gun block is responsible for holding air. Check reg bleed hole for leaks also with bolt closed put a balloon over end of barrel. See if it inflates.
     
  7. keithy

    keithy Posting Addict

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    if you take the reg out it will be fac and tricky to get a flat power curve. I bought one with a quick fill it had a power curve like a rainbow
     
  8. Squintykid

    Squintykid Engaging Member

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    Assuming no external leaks..bubble test on bottle holder.......have you removed the mod and checked for air coming from the barrel ? (bolt closed)
    Is it louder than usual? ...dynamic air leak
    Would guess at valve o-rings, 5p part failure.

    Wouldn't bother with a QF, plenty of shots as is and there is the cutting ...:(
     
  9. katluke

    katluke Donator

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    Thinking of getting a quick fill and gauge kit too. Preferably one that doesn't stick out too far. I like the ones that replace the reg and do a v type cut out. I'm just too scared to cut the stock myself.

    Dan

    Before fitting a gauge and quickfill remember that this will add more orings to the guns action so more potential possible leak spots and also the chance of ruining your stock . Far better to just do a chrono string from a full charge to work out your shot count and this will also give you your ave fps across the full string ( handy for setting scope up) Once you know shot count of your gun just keep that amount of pellets in a suitably sized container, then once there gone its time for a refill and no more guess work. hth
     
    Last edited: Sep 14, 2019
    2506sendero and Tim_B like this.
  10. danfullwood

    danfullwood Active Member

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    Sounds like I need a chrono.

    .
     
  11. sharpsman

    sharpsman Posting Addict

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    The dr bob one can be fitted and you can still leave your reg in place, the stock drilling is easy if done by some one who knows what they are doing, the extra o rings shouldnt cause a problem the one likely to leak is the one on the fill valve and that is only a two minute job, not everyone agrees but just knowing the pressure you have left and more importantly lets you know if you have a slow leak is what pushed me to fitting one.
     
  12. buffy vampire slayer

    buffy vampire slayer Keyboard Hero

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    are you sure the bottle is fully tightened.if you're not too familiar with rapids,when you think it is,generally it will screw in another half turn or so.
     
    32:1 and bucketboy like this.
  13. keithy

    keithy Posting Addict

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    As above they are very tight when first screwed on, after a shooting session before you put the gun in your bag check and see if the bottle will tighten further. I asked about this recently and the general opinion was tighten too the stop. I now do this but it is a real strength test with a fully charged bottle BEWARE it is possible to snap your stock at the start of the butt section doing this so be careful how you hold the rifle.
     
  14. danfullwood

    danfullwood Active Member

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    Definitely sure it's on all the way. Going to need to chrono it I think.

    .
     
  15. Vard

    Vard Posting Addict

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    If Kev g has set your rifle up it should be singing as sweet as it possibly can.
    If you have any concerns get back in touch with him as am sure he would go out of his way to make you happy .
    Also @bucketboy on here is pretty awesome on things rapid .
    Both are the go to people IMO.
    As for quick fill and regs ....
    RAW ones from Tawns although expensive are I believe factory spec???? If not better.
    Kev g also does ones for mk1 rapids .
     
  16. danfullwood

    danfullwood Active Member

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    I’m not worried about the work he has done. I’m an engineer myself and I was in awe watching him work.

    My concern is that perhaps one of the parts in my rifle could have failed afterwards. Not really knowing much about the design I am wondering if there’s something other than a leak that could be causing a lack of efficiency.

    Dan.


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  17. bucketboy

    bucketboy Keyboard Hero

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    could be a few things.
    Probe not seating correctly wasting air
    Inner probe allowing air to escape into bolt
    Hammer bounce due to too little hammer load
    Inertia weight not doing its job, ( sticking, mashed spring or in backwards)
    Valve sticking open
    Valve stem not sealing in valve tail
    Air coming out of valve location screw
    Your gun running hot
    Barrel not sealing in block
    Your barrel only 3” long


    Bb
     
    bigal, danfullwood and 2506sendero like this.
  18. danfullwood

    danfullwood Active Member

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    Thanks for that. I had considered a couple of those. Namely the gun running hot and hammer bounce. I’m pretty sure something is up despite not being able to keep a true track of it (lack of a gauge). I’d know if I was getting 400 shots though. I’ve filled up 3 times in less than a tin of pellets.

    I think the barrel is longer than 3” haha!

    I need it checking out at some point. Will probably take it back to Kev. Alternatively I do go to Peterborough regularly if you could help? Once I’ve gotten past the imminent arrival of my son (birth will be tomorrow).

    Dan


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  19. bucketboy

    bucketboy Keyboard Hero

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    Yes mate I can help.

    Best of luck on the birth:thumb:

    and to mum...

    That’s going to sting a little:D

    Bb
     
    danfullwood likes this.
  20. katluke

    katluke Donator

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    There have been plenty of posts over the years on R7OC regarding leaking quickfills/gauges so it is common. If you do have a leak having a quickfill fitted means you also have other areas to check. Less orings in a guns action the better as it reduces the amount of possible leak areas.If you have ever had to chase down a really slow leak on a Rapid you know that less orings is better. If you know your shot count it removes all guess work and you do not need to know what pressure you have left. As well as some of these available quickfills when fitted pushing the bottle forward which looks crap imo .
     
    bucketboy likes this.

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