Daystate Huntsman – Looking for hammer spring rate

Forums PCP Airguns Daystate Huntsman – Looking for hammer spring rate

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    MDiver
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    Hi

    I am looking for information on hammer spring rate v power on Daystate slingshot rifles.
    For example: 10.28 lb/in spring gives me 11.4Fpe
    Thank you

    Sorry, edited spring rate again as my conversion from metric was wrong!

     

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    MDiver
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    If I could have spring dim’s for given power, that would be a massive help.
    Thank you

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    jking
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    Mdiver, I can get you those dimensions but it’ll be Sunday or Monday. Out of town right now.
    jimmy

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    MDiver
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    Many thanks Jimmy.  I sure can wait

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    jking
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    Here ya go, these are out of my 22fac.
    Jimmy



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    MDiver
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    Many thanks Jimmy.
    This will really help me to understand power mods better.
    Your spring is 48% stiffer than the one I have in my 12fpe HC.
    Do you also have a top hat on your spring?
    Is your gun fitted with slingshot hammer?
    What fpe do you get with this spring?
    Bruno

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    jking
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    You bet Bruno,
    No bushing on mine. It does have a short piece of slitted plastic that is very thin,  about 5/8 tall that slides over the spring loosely. I’m not sure what it’s for but I bet it could be left out and no difference would be noticed.
    Yeah, “sling shot hammer”
    I’m normally shooting it around 29-31fpe with 18.1’s
    I’m not sure what other differences that might be between the 12fpe and a 30fpe. Maybe transfer port and barrel port size?
    I had it completely apart the other day, I should have measure that then.
    Jimmy

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    jking
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    Forgot to ask Bruno, did you calculate the stiffness of the springs somehow? Just curious.
    Jimmy

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    MDiver
    Participant
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    My HC .177 114cc small tank (July 2012)
    No bushing on mine and same slitted sleeve over the spring.
    Power on my Hc had been tweaked by previous owner to achieve 15fpe by screwing the striker adjuster so far out that it protruded by ~1/4. End result was a poor shot string  with only 30 good shots per fill (so going from its original 60 12fpe shots to 30 15fpe shots).  High price to pay for 3fpe!
    So decided to go back to its intended power ~11.4, and it is in this configuration today.
    … But I want a bit more power!  IMHO, playing with the striker adjuster is very limited to achieve power increase, as it will quickly compromise the slingshot system.
    So thanks to you Jimmy I will now source a spring with an extra ‘x’ % stiffness to get more power, 18fpe could be my target (?)
    I am aware that other parameters could come into play, but one thing at the time.  The next step will then be to fine tune the damned slingshot to achieve that sweet power curve.
    I will measure ports size once the gun is in bits.  I don’t think they will be different from yours
    Springs characteristics so far:
    for 12fpe:  OD: .726;  Wire: .063;  Active coils: 7.75; Free length: 2.362; Stiffness: 10.28 lb/in
    for 30fpe:  OD: .725;  Wire: .069;  Active coils: 7.75; Free length: 2.214; Stiffness: 15.22 lb/in

    Spring rate (stiffness) calculated using: http://www.acxesspring.com

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    MDiver
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    I have just find out that there are 2 different slingshot hammers fitted on these rifles:

    So comparison between springs can only be done with the same hammer.

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    Hopetown
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    Question for Jimmy:  A bit off the subject but is close.  I just bought a slightly used Regal based on reading a lot of Jimmy’s write ups.   Mine is fine in all respects but it is very hard to cock.   I have played with how I pull the bolt back and think it is hard due to maybe the power adjustment has been adjusted for more power or maybe it needs something done to it. The first part of the pull back is pretty smooth and doesn’t have much feeling of needing lubrication.   Do you have any suggestions on where to start in reducing the cocking effort?
    ​Jim

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    MDiver
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    Are you getting close to coil bound?

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    Rosco860
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    I just bought a new Regal a couple months back and I love it. I don’t have the confidence yet to tinker and adjust it, so I just leave it alone and shoot it. It’s just so good in stock form, I figure don’t mess with a good thing. But to Hopetowns point, mine too is really tough to cock. I thought maybe it’s my carple tunnel issue in my hands but it’s not that. Any info on why it cocks so hard and fits would be appreciated.

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    MDiver
    Participant
    Member

    From a member on Daystate owners club:
    “First check the adjustment of the bolt Alen head grub screw, it’s located at rear of dovetail, may be under rear scope point. Slacken of a quarter turn and try again. Make a note of what you do and let us know how you get on.”

    I have tried it, 1/4 turn ccw has done it for me.  Happy with result

    Hope this help

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