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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
shawns video is confusing me but i would recommend
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<blockquote data-quote="jmden" data-source="post: 207116" data-attributes="member: 1742"><p>tjon,</p><p> </p><p>These weather stations/ watches/whatever make altitude predictions (and that's all they are) based on the barometric pressure. If you really want to know your altitude, use a GPS with good reception to many satellites located in very different parts of the sky, set it down and give it time to really lock in this nubmer--this is probalbly the most accurate and even that will change a bit on the unit. And even if you can pinpoint your location on a topo, you still have to try to estimate your altitude between lines on the map. </p><p> </p><p>So, as barometric pressure changes with you moving up or down in elevation or a hi or lo pressure weather system moves in when you haven't changed elevation at all, your weather station will tell you that your elevation has changed--a very poor way to get accurate elevation. If you can pinpoint your elevation with GPS or topo and enter this in your weather station, your altitude reading will still change even if you don't change elevation as lo and hi pressure weather systems move in and out of the region. So, altitude by itself in regards to trajectory calculation, in my understanding, means next to nothing. It is station barometric pressure that is the important factor, not altitude, to determine bullet path. </p><p> </p><p>Now there may be some ethereal calculations that can show that the bullet will change it's flight due to changes in gravitational pull or the coriolis effect or the like if you change elevation drastically, I don't know. But I think that for meat and potatoes LRH, these issue are probably not important. I'm sure there are others on LRH.com that are much more versed in all of this that can set us straight, if that is not the case.</p><p> </p><p>Good luck.</p></blockquote><p></p>
[QUOTE="jmden, post: 207116, member: 1742"] tjon, These weather stations/ watches/whatever make altitude predictions (and that's all they are) based on the barometric pressure. If you really want to know your altitude, use a GPS with good reception to many satellites located in very different parts of the sky, set it down and give it time to really lock in this nubmer--this is probalbly the most accurate and even that will change a bit on the unit. And even if you can pinpoint your location on a topo, you still have to try to estimate your altitude between lines on the map. So, as barometric pressure changes with you moving up or down in elevation or a hi or lo pressure weather system moves in when you haven't changed elevation at all, your weather station will tell you that your elevation has changed--a very poor way to get accurate elevation. If you can pinpoint your elevation with GPS or topo and enter this in your weather station, your altitude reading will still change even if you don't change elevation as lo and hi pressure weather systems move in and out of the region. So, altitude by itself in regards to trajectory calculation, in my understanding, means next to nothing. It is station barometric pressure that is the important factor, not altitude, to determine bullet path. Now there may be some ethereal calculations that can show that the bullet will change it's flight due to changes in gravitational pull or the coriolis effect or the like if you change elevation drastically, I don't know. But I think that for meat and potatoes LRH, these issue are probably not important. I'm sure there are others on LRH.com that are much more versed in all of this that can set us straight, if that is not the case. Good luck. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
shawns video is confusing me but i would recommend
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