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April 27, 2017, 02:44 AM | #1 |
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Cartridge impulse - slide weight - spring force
Is there a formula for calculating the spring force in a straight blowback handgun with a given cartridge impulse and slide weight?
Thx
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"Get off of my lawn!" Walt Kowalski . ISSC PAR .223 |
April 27, 2017, 06:36 AM | #2 |
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April 27, 2017, 02:15 PM | #3 |
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Kozak,
That is a great resource! Thanks. |
April 28, 2017, 02:42 AM | #4 |
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I still don't get it - if the spring force was irrelevant for the blowback action, why would you have to change the spring e.g. when changing caliber in multi-caliber pistols?
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"Get off of my lawn!" Walt Kowalski . ISSC PAR .223 |
April 28, 2017, 05:56 PM | #5 | |
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Quote:
It's just not what holds the bolt in place alone. It's purpose is to cushion the blow, and return the bolt to battery.
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April 28, 2017, 11:09 PM | #6 |
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Most blowback pistols and rifles will work fine without any return spring at all, and some have been made that way, including a single shot rifle and a single shot pistol, both .22. At least one .32 ACP pistol has been made with no return spring. A few pistols made for use with suppressors have a padded bolt and no return spring so as to keep the bolt clatter to a minimum. Of course, the bolts have to be returned to battery by hand.
Jim |
May 2, 2017, 04:56 AM | #7 | |
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I'm not sure on this one.... |
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May 2, 2017, 11:41 AM | #8 | |
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Quote:
Additionally—although factory caliber-change kits may not have been offered—many blowback pistols offered in both .32 and .380 with barrels that aren't fixed to the frame can be switched between calibers easily. For example, the Beretta 81 and 84 can exchange calibers with a simple barrel and magazine swap; the recoil springs are actually the same!
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May 2, 2017, 05:03 PM | #9 |
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Thanks Chris!
I didn't know such a critter was out there. |
May 3, 2017, 07:32 AM | #10 | |
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Quote:
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May 3, 2017, 04:41 PM | #11 | |
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Quote:
I forget which volume its in, but in one of the volumes of "The Machine Gun" (col Chinn) there are formulas for calculating bolt mass & spring tension needed for blowback operation of various cartridges.
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May 5, 2017, 11:25 AM | #12 |
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Chinn Vol 4,...it's in the link up above by kozak6
Really neat info - in addition to that info. |
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