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General >> Here Be Maths... >> Ballistics Discussion Sticky https://slinging.org/forum/YaBB.pl?num=1526430182 Message started by woodssj on May 15th, 2018 at 8:23pm |
Title: Ballistics Discussion Sticky Post by woodssj on May 15th, 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 |
Title: Re: Ballistics Discussion Sticky Post by NooneOfConsequence on May 16th, 2018 at 8:03am
Hey! Those spherical cows come in handy sometimes ;D
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. |
Title: Re: Ballistics Discussion Sticky Post by NooneOfConsequence on May 16th, 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. |
Title: Re: Ballistics Discussion Sticky Post by woodssj on May 16th, 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. |
Title: Re: Ballistics Discussion Sticky Post by NooneOfConsequence on May 16th, 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 :) |
Title: Re: Ballistics Discussion Sticky Post by NooneOfConsequence on May 16th, 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 |
Title: Re: Ballistics Discussion Sticky Post by woodssj on May 17th, 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. |
Title: Re: Ballistics Discussion Sticky Post by NooneOfConsequence on May 17th, 2018 at 1:19am
Wait... the administrator of the maths forum hates math?!
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Title: Re: Ballistics Discussion Sticky Post by woodssj on May 17th, 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. |
Title: Re: Ballistics Discussion Sticky Post by woodssj on May 20th, 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=the-ballistics-of-the-sling---thom-richardson |
Title: Re: Ballistics Discussion Sticky Post by NooneOfConsequence on May 21st, 2018 at 9:32am
That's a nice summary. Thanks!
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Title: Re: Ballistics Discussion Sticky Post by KnollSlinger on Jun 16th, 2021 at 12:52am woodssj wrote on May 17th, 2018 at 7:30pm:
circular cow alone in the universe |
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