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slow and heavy
buschmaster
Member Posts: 14,229 ✭✭✭
Sam06's Combat Master shoots .45 USGI Ball at 700 ft/s. slow as a bb gun. I'm sure we have all shot a .45 at one time or another and could see the bullet flying downrange.
how about a bullet so slow you can see it coming at you. [:)] I'm thinking 400 ft/s and still have a power factor of 200, about that of a .45ACP.
that would take a 500 grain bullet and probably have to be .60 or .75 caliber.
50GI uses 300 grain bullets, if you could get away with 500 grainers somehow....
how about a bullet so slow you can see it coming at you. [:)] I'm thinking 400 ft/s and still have a power factor of 200, about that of a .45ACP.
that would take a 500 grain bullet and probably have to be .60 or .75 caliber.
50GI uses 300 grain bullets, if you could get away with 500 grainers somehow....
Comments
BLOOP!
And watch the round go downrange....... WHOOMPH!
Sam06's Combat Master shoots .45 USGI Ball at 700 ft/s. slow as a bb gun. I'm sure we have all shot a .45 at one time or another and could see the bullet flying downrange.
how about a bullet so slow you can see it coming at you. [:)] I'm thinking 400 ft/s and still have a power factor of 200, about that of a .45ACP.
that would take a 500 grain bullet and probably have to be .60 or .75 caliber.
50GI uses 300 grain bullets, if you could get away with 500 grainers somehow....
You are right about slow. I remember when I went to the gravel pit to shoot that Mk1 if the sun was out(Very unusual in Western WA state[;)]) You could see the sun "glint" off the bullets.
I have been shot at more than most folks I know and I have never seen a bullet coming at me. I have seen mortar round coming in and at night I have seen arty burning the air but no bullets. Mk 19 rounds can be seen in bound as can the Russian AGS-30 rounds.
I guess if everything was right you could see a bullet but it would have to be slow and it would have to have the sun/light just right.
"Incoming rounds always have the right of way!"
400 ft./s with a 500 gain projectile? It might get out to about 50 feet before it hits the ground, that is if you were aiming at the sky
You need to brush up on your physics just a wee bit.
If fired from a height of 5 feet with the barrel dead horizontal, it would take approx 1/2 second for the bullet to hit the ground. That would be 200 feet or 4 times your example.[}:)]
In a vacuum.
Wouldn't matter much. You'd need zero gravity to make it fly straight.
Oh goody!! Can we argue about this?? Can we?? Can we??[:)][}:)][:p]
Just give it some time Ricci. [:0][:D]
in a vacuum, of course, there isn't air to give it resistance and reduce the speed, thereby reducing the distance it travels. but the effect is small and should be ignored if we are to understand how this works.
you will notice that while the bullet's time-to-hit-the-ground is increased by the first term, the time is decreased by the second term (less forward velocity, according to the cosine) and that is why you always get the maximum distance by aiming at 45 degrees.
Once again, 45 degrees is the optimum angle 'in a vacuum'. In 'reality' the angle is usually between 30 and 40 degrees.
ever see a .45acp shot at 200 yards?
midwest regional championship had a side match for cash 1.00 a shot at a popper placed 200 yards out, first guy up unloaded a magazine downrange every bullet hit the ground, 1 bullet bounced up and hit the popper at 7 seconds, he was aiming at about 35 degrees
quote:Originally posted by iceracerx
quote:Originally posted by buschmaster
in a vacuum, of course, there isn't air to give it resistance and reduce the speed, thereby reducing the distance it travels. but the effect is small and should be ignored if we are to understand how this works.
you will notice that while the bullet's time-to-hit-the-ground is increased by the first term, the time is decreased by the second term (less forward velocity, according to the cosine) and that is why you always get the maximum distance by aiming at 45 degrees.
Once again, 45 degrees is the optimum angle 'in a vacuum'. In 'reality' the angle is usually between 30 and 40 degrees.
...and once again, the example ignores air resistance so you can understand how this works. if you don't think that's necessary why don't you explain how 'in reality' the optimum angle is 30-40 degrees... without referring the 'ideal' mechanics in a vacuum. I would like to see how that goes.
Actually, a ballistics calculator 'factors' in 'drag' when the bullet's 'ballistic coefficient' in input. If your 500 grain 'example' is just a larger version of the 230 grain Hardball round, it's BC = 0.205 (for your velocity)
You can Google info on the 'optimized' angle. I did (because I can't lay my hands on my artillery book)
so explain why the optimum angle is 30-40 degrees.
I don't care about google. I didn't use it to get the base equation, or the trigonometric derivative, or to c&p the explanation. did it all on my own.
go ahead. google me an explanation. without referring to the ideal case that says 45 degrees.
I didn't google the formula to determine the time for the projectile to drop from 5', either. And I took basic Newtonian physics over 40 years ago.
I was told over 50 years ago that the optimum angle for maximum range was 30 degrees. Equipped with that 'fun fact' I sought information from a reliable source (those sites that end in .edu) for a more definitive answer. I'm satisfied.
You want to come off as a smart fella, do your own research. Or not. I've already given you the 'real world' answer.
PS: Here's another 'fun fact'. (passed on by the same guy that told me about the 30 degrees) If the range is sufficient and you see the plume of gas exit the barrel pointed at you, you should duck. (and 'we're' talking about high powered rifle 'bullets').
we can use the standard quadratic solution
x = [-b +/- SQRT(b^2 - 4*a*c)] / 2*a
Hey, watch your language. [;)][:)]