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Old 02-21-2014, 11:47 AM   #11
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Well to stabilize a 308 the barrel would have to hit something north of 200,000 rpm...

A dremel tool which is pretty speedy barely hits 35,000 rpm...

A 20mm vulcan spins at About 7000 rpm...

An average car tire rotates at around 800 rpm at 60 mph...

I doubt you could put enough vents in a barrel to get it going that fast. I doubt you could do it using a turbo jet engine for propulsion.

Rifling is a very simple cheap and elegant solution to stabilizing projectiles. One of the main reasons we aren't using rail guns is, there is no way to effectively stabilize the projectile at range
Rail guns are coming and most big tanks have smooth bore cannons. The projectiles are self stabilizing and very accurate.
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Old 02-21-2014, 11:54 AM   #12
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If the barrel would most likley spin off alot of the bullets volicity. When the bullet hit ls the rifiling on a barrel that spins it would want to find the easest path out and doing the math would most likley start spinning the barrel before the gases hit tue comp.

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Old 02-21-2014, 05:36 PM   #13
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good point

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Old 02-21-2014, 06:03 PM   #14
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I didn't say use the barrel rotation to stabilize the bullet instead of barrel rifling, barrel still has rifling.
I said barrel rotates only after bullet left the barrel, let's take a look at guns like PX4, although not 360 degrees, but its barrel rotates too. I know the concept is different at all, PX4 rotates back n' forth and it's short recoil cam driven, but it only rotates after bullet left the barrel and stops while chambering.

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Old 02-21-2014, 06:14 PM   #15
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Rail guns are coming and most big tanks have smooth bore cannons. The projectiles are self stabilizing and very accurate.
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I didn't say use the barrel rotation to stabilize the bullet instead of barrel rifling, barrel still has rifling.
I said barrel rotates only after bullet left the barrel, let's take a look at guns like PX4, although not 360 degrees, but its barrel rotates too. I know the concept is different at all, PX4 rotates back n' forth and it's short recoil cam driven, but it only rotates after bullet left the barrel and stops while chambering.
they are smooth bore fin stabilized rounds or saboted rounds where the sabot imarts spin. short range projectiles only. rail guns are extreme high velocity and current metalurgy tends to rip fins or destabilize the rounds unless perfectly machined costing a ton. anyway rail guns are impractical right now and just a huge sinkhole to burn tax dollars.

rotating barrel serves no purpose after the bullet leaves the barrel... the px4 the barrel doesnt spin it just unlocks sideways instead of up and down to get a lower bore axis. it serves no plus or minus in recoil due to the rotation itself. a lower bore axis improves how recoil forces are applied.
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Old 02-21-2014, 06:46 PM   #16
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HSQ, That is a lot of energy spent in trying to accomplish the action you are looking for.

I don't know your experience, but check out the bolt carrier of an AR or such rifle.

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Old 02-21-2014, 07:01 PM   #17
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well, your probably right. I couldn't decide to stop doing dumb things
I kinda reversed the concept of PX4 and drew this

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Old 02-21-2014, 07:07 PM   #18
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to be honest, I aint no expert or enthusiast, all my firearm experience were the few magazines I shot out of a glock in a shooting range long while ago, I just dont have all the money and time in the world to support what I like, but I do enjoy watching everything about firearms on the internet espeicaly those channels on youtube

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Old 02-25-2014, 03:44 AM   #19
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You're overlooking Newton's law. An object at rest tends to stay at rest.

Since the bullet (and gasses) are in the barrel about .001 seconds or so, I would hate to think of the amount of energy it would take to rotate a mass of a few pounds to the point it would do any good.....IF it did any good to do so.

On the other end of it, the forces acting on a rifle from firing are a forward/back force, again based on "equal and opposite reactions". The weight of the firearm counters the forward force being placed on the projectile. A modern compensator also redirects some of the gasses expelled, which acts the same as the initial force, only in the reverse direction. The only force you suggest to impart on the system is rotational, which is not a part of the forces being placed on the system. (ever heard of a large bore rifle being redesigned to make it heavier? That's why.)

If you are referring to the affects of the projectile spinning in the rifling, that force is countered by the weight of the barrel, which is more than sufficient absorb that force. Also, twist is selected very specifically for stabilization. Any alteration of that would throw the end gyroscopics off by either decreasing or increasing the rotation of the projectile, depending on the direction you proposed to turn the barrel. Come to think of it, if the barrel spun freely enough, theoretically the barrel would start to spin opposite the twist, counteracting what ever the porting did further down the barrel.

You can tinker all you want, but the laws of physics will remain consistent.

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Old 02-26-2014, 07:42 AM   #20
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knowledge received. thank you

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