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Thread 64502508

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Anonymous No.64502508 [Report] >>64502553 >>64502555 >>64502564 >>64502586 >>64502647 >>64503481
Firearm ideas
I had a great idea /k/.

People keep rifling gun barrels so that the bullet spins, right? Well, what if we build a gun that has a spinning barrel? Like, the barrel spins super fast while if fires the bullet. That would make the bullet spin even more faster and be more accurate, right? Or, maybe it could spin to the bullet to make it curve, kind of like a pitcher throwing a curve ball. Think about it.
Anonymous No.64502547 [Report]
I kinda want to get a 7mm prc rifle and rebarrel it with a .510 barrel, then cut down 375 ruger brass and load it with .510 bullets to just under 7mm prc length.. it should fit in the mag, have to work out the pressures, and let you fire fuckhuge bullets at faster than 500 mag velocities without having to mess with the bolt face…
Anonymous No.64502553 [Report]
>>64502508 (OP)
introduce a bunch of moving parts and complexity, have to keep a barrel on a lathe, all you get in return is supposedly reduced barrel wear.
Anonymous No.64502555 [Report]
>>64502508 (OP)
cheaper to just spin the rifle while you shoot it, git gud
Anonymous No.64502564 [Report]
>>64502508 (OP)
Baseball spin is only as effective for generating movement as it is because of the seams.

Here's your challenge, how do you get a good gas seal between your spinning assembly and static assembly? What about balancing and supporting your rotating assembly?
How about not turning your gun into a mobile Chinese industrial accident?

There are already extreme twist rate cartridges out there that kind of answer your question about "what if spin? But more?"
Anonymous No.64502571 [Report]
More guns should have reciprocating barrels. I dont know anything about them, theyre just cool.
Anonymous No.64502586 [Report] >>64502620
>>64502508 (OP)
>what if we build a gun that has a spinning barrel
Theoretically that could work. Now go to the math on how fast a bullet spins and you'll see how ridiculous of an idea that is.
Anonymous No.64502588 [Report] >>64502599
An artillery piece where you can pull a vacuum in the bore to increase muzzle velocity would be kind of fun, I know that's common with really high powered air cannons
Anonymous No.64502599 [Report] >>64502620
>>64502588
>I know that's common with really high powered air cannons
Anonymous No.64502620 [Report] >>64502816
>>64502586
You can already reach high enough spin rates to where the bullet disintegrates due to hoop stress with high twist rate rifling, you don't need to get overly fancy with it.

>>64502599
I mean these things, which are more akin to lab equipment.
https://youtu.be/E60G3ba4TUA
Anonymous No.64502647 [Report]
>>64502508 (OP)
there is an optimal spin for a bullet op based on weight, length, diameter from memory I think its miller formula(just checked...wrong it is the miller twist rule). There are more subtelties like how gyroscopic force is effected by the core of the bullet being hollow or having a lighter material etc etc but the main point is there is an optimal spin rate for a certain bullet and you would gain nothing much from your proposal but I stand to be corrected, spin too fast and the bullet won't follow the arc trajectory, faster rpm would just diminish accuracy so there is an ideal range of rpms between the slowest and fastest for given bullet. Just adding more RPMs above the ideal range would be bad. Most efforts in rifling aim to impart the idea RPM while also reducing velocity as little as possible. A secondary factor is barrel vibration and tuning, imagine a light whippy stick that you flick around and how the end of the stick moves, now imagine a heavy thick stick, the end does not whip around (many accuracy barrels are heavy for this reason but all barrels have whip and a multi wave vibration pattern. For accuracy nuts like me this can be tuned out by carefully handloading and adding weight at an ecact point on the end of the barrel..imagine tying a lead weight to the end of your whippy stick..see, the end whips around less. By spinning the barrel you would cause the barrel whip to spray bullets much less predicably and cause chaos with barrel harmonics.

https://en.wikipedia.org/wiki/Miller_twist_rule

I don't want to discourage your inventiveness but just give you an idea of the wonderful complexcity you are begining to understand. Consider reading
"The Gun and Its Development by Greener W W,

Which I think (you check I think it has many of the early formulas in it. ). Of course formulas imroved and got even more exacting, a classic is 1910 is "Lehrbuch der Ballistik" (Textbook of Ballistics) Karl Julius Cranz,
Anonymous No.64502816 [Report]
>>64502620
>You can already reach high enough spin rates to where the bullet disintegrates due to hoop stress with high twist rate rifling, you don't need to get overly fancy with it.
My point was that even something like a slow-twist black powder projectile spins at many 10's of thousands of RPM, enough to make such a gun extremely complex with all sorts of problems. A modern rifle bullet spins even faster, to the point that duplicating this with a spinning barrel would be a big fucking challenge.
Anonymous No.64503481 [Report]
>>64502508 (OP)
Spinning the barrel takes a lot of energy that you could use to propel the bullet forward.