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woodssj

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Ballistics Discussion Sticky
May 15^th, 2018 at 8:23pm

For all your Ballistics discussion needs.

Enjoy, and remember these important formulas:

Range:
Horizontal Range=(v0)^2 (sine of 2x launch angle) / 2g
Where:
v0 = initial velocity (m/s)
g = acceleration due to gravity (9.80 m/s2)

Ballistic Coefficient:
https://en.wikipedia.org/wiki/Ballistic_coefficient

Initial Velocity from Range and Angle:
https://answers.yahoo.com/question/index?qid=20110413210958AAS1wm1&guccounter=1

Also, Gravity, Friction, and Atmospherics exist. Please no Spherical Cows.
https://en.wikipedia.org/wiki/Spherical_cow

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NooneOfConsequence

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Re: Ballistics Discussion Sticky
Reply #1 - May 16^th, 2018 at 8:03am

Hey! Those spherical cows come in handy sometimes Grin

Don’t forget the internal/intermediate ballistics category where your projectile gets all that spin stabilization and where small variations in release timing have a huge impact on accuracy.

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Re: Ballistics Discussion Sticky
Reply #2 - May 16^th, 2018 at 8:17am

Magnus effect is another big issue for slinging:
https://en.m.wikipedia.org/wiki/Magnus_effect

With practice, you can use it to throw curveballs. It’s also a driving factor in choosing a slinging style: underhanded throws drop to the ground prematurely with frontspin but Apache with backspin floats a bit longer thanks to Magnus.

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler

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woodssj Forum Moderation Offline That lake isn't going to fill itself, y'know... Posts: 302 'Round & about, Here and there Gender:	Re: Ballistics Discussion Sticky Reply #3 - May 16^th, 2018 at 6:17pm Interesting. I didn't think we would be dealng with velocities or distances which would require those calculations, but the more I look at it, Slings are vastly different from the Rifles I work with otherwise. This could get real interesting real fast.
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NooneOfConsequence

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Re: Ballistics Discussion Sticky
Reply #4 - May 16^th, 2018 at 9:00pm

there are more degrees of freedom and fewer constraints on a sling projectile compared to a rifle bullet. With a slight wrist adjustment, you can change the orientation of the spin relative to the direction of travel and can have all sorts of stable (or unstable) ballistic states for a glande.
The physics model can get quite complicated... especially if we aren’t allowed to assume any spherical cows

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler

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NooneOfConsequence

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Re: Ballistics Discussion Sticky
Reply #5 - May 16^th, 2018 at 9:03pm

Magnus is pretty easy to demonstrate at slow speeds too. All you need is a large surface area to mass ratio for your projectile:

https://m.youtube.com/watch?v=4VFcovvvQXA

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler

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woodssj

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Re: Ballistics Discussion Sticky
Reply #6 - May 17^th, 2018 at 12:35am

Neat.

Also, I'll have it be known that I despise maths in much the same way as Dr. Irving Finkle of the British Museum. His video on playing the Royal Game Of Ur is a pretty good description at 10 minutes and 21:30 there.
https://www.youtube.com/watch?v=WZskjLq040I

But regardless, there's some basic calculation to clear out of the way first: Angle of shot, muzzle velocity, bullet mass, and so on to get some theoretical maximum ranges. Then, we move into adding drag and ballistic coefficient (determined by ammo), and so on.

You're far ahead of me on this... So have at it. But, cover the basics first.

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NooneOfConsequence

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Re: Ballistics Discussion Sticky
Reply #7 - May 17^th, 2018 at 1:19am

Wait... the administrator of the maths forum hates math?!

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler

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woodssj Forum Moderation Offline That lake isn't going to fill itself, y'know... Posts: 302 'Round & about, Here and there Gender:	Re: Ballistics Discussion Sticky Reply #8 - May 17^th, 2018 at 7:30pm That's besides the point... let's get the discussion based initially around a muzzle velocity rage, determined as the possible and attainable. I'd say about 50m/s would be a good general rule.
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woodssj Forum Moderation Offline That lake isn't going to fill itself, y'know... Posts: 302 'Round & about, Here and there Gender:	Re: Ballistics Discussion Sticky Reply #9 - May 20^th, 2018 at 3:13pm Well....... This is really handy, what with the website being somewhat accessible again: https://web.archive.org/web/20121016213520/http://slinging.org/index.php?page=th...
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NooneOfConsequence

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Re: Ballistics Discussion Sticky
Reply #10 - May 21^st, 2018 at 9:32am

That's a nice summary. Thanks!

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler

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KnollSlinger Senior Member Offline The Davidson Road KnollSlinger Posts: 356 Chandler, Arizona, USA Gender:	Re: Ballistics Discussion Sticky Reply #11 - Jun 16^th, 2021 at 12:52am woodssj wrote on May 17^th, 2018 at 7:30pm: That's besides the point... let's get the discussion based initially around a muzzle velocity rage, determined as the possible and attainable. I'd say about 50m/s would be a good general rule. circular cow alone in the universe
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