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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
5,000 fps coyote rifle?
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<blockquote data-quote="ntsqd" data-source="post: 1761621" data-attributes="member: 93138"><p>Due to this thread I got curious about centripetal force acting on the bullet at that velocity. Suppose you had a bullet that was stable at 3000 fps, what twist would you want to hopefully duplicate that stability at 5000 fps? I'm intentionally ignoring all of the other factors in the reality of this and just looking at twist rate in an effort to duplicate projectile rpm. I've also noted the resulting RPM so if you had a desired rotational speed the twist can be chosen. It's a simple Excel file, but the forum won't allow that upload, so PM if you want it so you can evaluate at different speeds.</p><p></p><p>3k twist: 6.5</p><p>5k twist: 10.8 </p><p>332308</p><p></p><p>3k twist: 7.0</p><p>5k twist: 11.7 </p><p>308571</p><p></p><p>3k twist: 8.0</p><p>5k twist: 13.3</p><p>270000</p><p></p><p>3k twist: 9.0</p><p>5k twist: 15.0 </p><p>240000</p><p></p><p>3k twist: 10.0</p><p>5k twist: 16.7 </p><p>216000</p><p></p><p>3k twist: 11.0</p><p>5k twist: 18.3 </p><p>196364</p><p></p><p>3k twist: 12.0</p><p>5k twist: 20.0</p><p>180000</p><p></p><p>3k twist: 13.0</p><p>5k twist: 21.7 </p><p>166154</p><p></p><p>3k twist: 14.0</p><p>5k twist: 23.3 </p><p>154286</p><p></p><p>3k twist: 15.0</p><p>5k twist: 25.0 </p><p>144000</p><p></p><p>3k twist: 16.0</p><p>5k twist: 26.7</p><p>135000</p><p></p><p>3k twist: 17.0</p><p>5k twist: 28.3 </p><p>127059</p><p></p><p>3k twist: 18.0</p><p>5k twist: 30.0</p><p>120000</p><p></p><p>Clearly this isn't the end-all, be-all solution but it does answer one of the questions.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 1761621, member: 93138"] Due to this thread I got curious about centripetal force acting on the bullet at that velocity. Suppose you had a bullet that was stable at 3000 fps, what twist would you want to hopefully duplicate that stability at 5000 fps? I'm intentionally ignoring all of the other factors in the reality of this and just looking at twist rate in an effort to duplicate projectile rpm. I've also noted the resulting RPM so if you had a desired rotational speed the twist can be chosen. It's a simple Excel file, but the forum won't allow that upload, so PM if you want it so you can evaluate at different speeds. 3k twist: 6.5 5k twist: 10.8 332308 3k twist: 7.0 5k twist: 11.7 308571 3k twist: 8.0 5k twist: 13.3 270000 3k twist: 9.0 5k twist: 15.0 240000 3k twist: 10.0 5k twist: 16.7 216000 3k twist: 11.0 5k twist: 18.3 196364 3k twist: 12.0 5k twist: 20.0 180000 3k twist: 13.0 5k twist: 21.7 166154 3k twist: 14.0 5k twist: 23.3 154286 3k twist: 15.0 5k twist: 25.0 144000 3k twist: 16.0 5k twist: 26.7 135000 3k twist: 17.0 5k twist: 28.3 127059 3k twist: 18.0 5k twist: 30.0 120000 Clearly this isn't the end-all, be-all solution but it does answer one of the questions. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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5,000 fps coyote rifle?
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