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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Altitude vs. Barometric pressure
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<blockquote data-quote="Mikecr" data-source="post: 1518328" data-attributes="member: 1521"><p>As mentioned earlier in the thread, DA is calculated from measurement of station Pressure, Temp, and Rh. These things(all 3) have to be measured, so it makes sense to simply use them directly.</p><p>A side problem with DA, at least in discussion, is that folks don't understand that DA has nothing to do with altitude. There are also devices out there that dismiss RH, providing pressure altitude in place of actual density altitude, because even the makers of these devices do not know the difference..</p><p></p><p>This weakness(dismissing Rh) also presents in ballistic software, and it matters because MACH# is affected by Rh. Again, the makers miss it.</p><p>This whole thread demonstrates that shortcuts lead to misunderstandings.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1518328, member: 1521"] As mentioned earlier in the thread, DA is calculated from measurement of station Pressure, Temp, and Rh. These things(all 3) have to be measured, so it makes sense to simply use them directly. A side problem with DA, at least in discussion, is that folks don't understand that DA has nothing to do with altitude. There are also devices out there that dismiss RH, providing pressure altitude in place of actual density altitude, because even the makers of these devices do not know the difference.. This weakness(dismissing Rh) also presents in ballistic software, and it matters because MACH# is affected by Rh. Again, the makers miss it. This whole thread demonstrates that shortcuts lead to misunderstandings. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Altitude vs. Barometric pressure
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