RYANSCHLESINGER wrote:The reason you thread a barrel is to make the projectile spin...
Aside for fact you didn't use the word "rifling", yeah - more or less.
...cutting down on resistance.
But this part is off. Rifling does not improve drag - much of the time, the rifling marks on the projectile actually worsen drag marginally. (And, as inonickname says, eccentricities caused by the spin also cause increases in drag).
There are two reasons to rifle a projectile.
Firstly, it imparts gyroscopic stability and stops the projectile just tumbling in the air.
Secondly, it "averages" out any aerodynamic imbalances in the projectile - things that on an unspinning projectile would cause the projectile to arc off in whatever direction. The high rate of spin means that these aerodynamic faults don't act in only one direction, and instead get spread out in ALL directions, stopping the projectile ending up wherever.
the backspin cuts down on air resisitance even more.
Again, no. Backspin does nothing to benefit drag.
Similarly to rifling, it imparts gyroscopic stability.
However, in place of "the aerodynamic averaging" what it does is produce lift via the Magnus effect, counteracting the forces of gravity.
But only to a limited extent - as drag slows the projectile, the airspeed over the projectile decreases, reducing the lift produced. Also, the projectile's angular velocity (revolutions per second) will drop, also losing lift.
Eventually, gravity will win.
this makes the projectiles fly more accuarate and faster.
More accurate - yes, both rifling and backspin offer accuracy improvements over an unstablised projectile.
Faster - No. Drag isn't reduced. The truth is that the energy expended in spinning the projectile reduces muzzle velocity.
However, backspin does offer a flatter trajectory - and with that, it can be used to shoot further (even disregarding the improvements on accuracy making longer ranges more effective.)
if anybody's going to try to intagonize me or try to be disespectful for one know what your talking about and to you can say it to my face.
Not trying to either antagonise you, and I don't see correcting someone as disrespectful.
Either way:
1) I do know what I'm talking about. Not the best on the forum, but definitely up there.
2) Sorry, "say it to my face" doesn't sound "hard" here, it sounds like you want us to come round your house to teach you science.
If i don't talk junk neither should anybody else
I'm sorry, but you are very much talking rubbish here.
An important thing to learn about this forum is that we do know our science pretty well. If for whatever reason, our science and yours don't match, it's more likely to be you in error.
If you do wish to question something that we've posted, feel free - but don't act like you're unquestionably right, because people who've acted like anyone who doesn't agree with them is an idiot inevitably look pretty silly when they get proven wrong.
