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General >> General Slinging Discussion >> Calculating release speed from distance https://slinging.org/forum/YaBB.pl?num=1637205605 Message started by IronGoober on Nov 17^{th}, 2021 at 10:20pm 
Title: Calculating release speed from distance Post by IronGoober on Nov 17^{th}, 2021 at 10:20pm
https://www.desmos.com/calculator/on4xzwtdwz
In the linked calculator, if you fix the ratio of crosssectional area to mass and the distance traveled is always the same. So, it should be possible to calculate max distance given a certain release speed for a sphere or ellipsoid of any size. Here, I assume a drag coefficient of 0.1 for the projectile and a spherical shape for simplicity (the Cd should probably be higher). For a 65 m/s throw, the distance is 340m with a 50g stone and 390m with 50g of lead. For Larry Bray's throw, the release speed I calculate using this method is ~75 m/s. It is similar for a 500m throw with 50g of lead. If you want to calculate it yourself: For a 50g projectile the ratios are (the ratios change if the mass is changed because area and volume scale differently): this is in kg/m^2 Lead:154 (1.01cm radius) Granite:59 Basalt:64 Approximately 41° is the optimal release angle with drag. I included a quick calculator if you want to use your own size/material. https://slinging.org/forum/YaBB.pl?action=downloadfile;file=MassToXsecArea.xls (26 KB  9
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Title: Re: Calculating release speed from distance Post by Sarosh on Nov 24^{th}, 2021 at 5:30am
somehow i didnt see this post.
nice calculator I dont understand the purpose of having different drag coefficients and surface areas for the x and y axis. 
Title: Re: Calculating release speed from distance Post by IronGoober on Nov 24^{th}, 2021 at 9:33am Sarosh wrote on Nov 24^{th}, 2021 at 5:30am:
Agreed. It doesn't seem to be that useful of a feature. 
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