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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Magnetospeed Error Correction
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<blockquote data-quote="Engineering101" data-source="post: 928208" data-attributes="member: 63138"><p><span style="font-family: 'Verdana'"><span style="font-size: 12px">MontanaRifleman</span></span></p><p> </p><p> <span style="font-family: 'Verdana'"><span style="font-size: 12px">I assume you are saying that the numbers on the displays of the two chronos closely matched. That is very interesting. I would expect that they would not match because there is velocity loss from the end of the barrel to a conventional chrono of about 7 fps (depending on bullet BC and how far down range you put the sky screens) so a conventional chrono should always read slower than a magetospeed which is right on the barrel. And for the reasons I stated above, the magneotospeed should read fast by about the same amount (depending on rifle recoil). Sooooo… when everything is working right the magneto readout should be about 15 fps faster than the conventional chrono. Did you take this correction into account when you say the chronos agreed with each other?</span></span></p><p> </p><p> </p><p> </p><p><span style="font-family: 'Verdana'"><span style="font-size: 12px">MudRunner2005</span></span></p><p> </p><p><span style="font-family: 'Verdana'"><span style="font-size: 12px">What gave me away? I knew I should have picked a different login right after I pushed the button. Yes I was a engineer – and now I'm just an old and senile gun nut.</span></span></p><p> </p><p><span style="font-family: 'Verdana'"><span style="font-size: 12px">You are of course correct when you say the bullet leaves the barrel way before you feel any recoil. In fact the rifle has moved about 0.060" backwards at that point, which on a human scale is essentially zero. It does however have a velocity of about 9 feet per second due to the equal and opposite reaction thing. I was just wondering how the magneospeed dealt with that.</span> </span></p></blockquote><p></p>
[QUOTE="Engineering101, post: 928208, member: 63138"] [FONT=Verdana][SIZE=3]MontanaRifleman[/SIZE][/FONT] [FONT=Verdana][SIZE=3]I assume you are saying that the numbers on the displays of the two chronos closely matched. That is very interesting. I would expect that they would not match because there is velocity loss from the end of the barrel to a conventional chrono of about 7 fps (depending on bullet BC and how far down range you put the sky screens) so a conventional chrono should always read slower than a magetospeed which is right on the barrel. And for the reasons I stated above, the magneotospeed should read fast by about the same amount (depending on rifle recoil). Sooooo… when everything is working right the magneto readout should be about 15 fps faster than the conventional chrono. Did you take this correction into account when you say the chronos agreed with each other?[/SIZE][/FONT] [FONT=Verdana][SIZE=3]MudRunner2005[/SIZE][/FONT] [FONT=Verdana][SIZE=3]What gave me away? I knew I should have picked a different login right after I pushed the button. Yes I was a engineer – and now I’m just an old and senile gun nut.[/SIZE][/FONT] [FONT=Verdana][SIZE=3]You are of course correct when you say the bullet leaves the barrel way before you feel any recoil. In fact the rifle has moved about 0.060” backwards at that point, which on a human scale is essentially zero. It does however have a velocity of about 9 feet per second due to the equal and opposite reaction thing. I was just wondering how the magneospeed dealt with that.[/SIZE] [/FONT] [/QUOTE]
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Magnetospeed Error Correction
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