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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Question About Ballistics App and Kestrel
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<blockquote data-quote="kyron" data-source="post: 1217376" data-attributes="member: 95130"><p>If you kestrel will give station pressure I would use that and set the pressure to absolute in your ballistic ae. The nonstandard temperature that is used to correct pressure altitude to density altitude is based on altitude. So it is comparing the current temp to the standard temp at your current altitude. It would quickly get confusing and very likely to make an incorrect entry to try to go from density altitude back to pressure altitude and temp.</p><p></p><p>The problem comes from the fact that even with an actual Mercury barometer the reading from that still does not give you the full picture of atmospheric density. You have to take temperature into account.</p><p></p><p>So a ballistic solver that is given station pressure and told it is absolute still needs temperature. Once it has that, it can calculate you density altitude which is what it uses to obtain your drop data. If you enter the density altitude where it is looking for pressure and then enter temperature it will correct the already corrected number for temperature. Resulting in it giving you bad drop information.</p><p></p><p>Density altitude is extremely important but most systems are not set up for you the user to even be aware that it exists. I would try to avoid using it for anything that is not specifically asking for it.</p></blockquote><p></p>
[QUOTE="kyron, post: 1217376, member: 95130"] If you kestrel will give station pressure I would use that and set the pressure to absolute in your ballistic ae. The nonstandard temperature that is used to correct pressure altitude to density altitude is based on altitude. So it is comparing the current temp to the standard temp at your current altitude. It would quickly get confusing and very likely to make an incorrect entry to try to go from density altitude back to pressure altitude and temp. The problem comes from the fact that even with an actual Mercury barometer the reading from that still does not give you the full picture of atmospheric density. You have to take temperature into account. So a ballistic solver that is given station pressure and told it is absolute still needs temperature. Once it has that, it can calculate you density altitude which is what it uses to obtain your drop data. If you enter the density altitude where it is looking for pressure and then enter temperature it will correct the already corrected number for temperature. Resulting in it giving you bad drop information. Density altitude is extremely important but most systems are not set up for you the user to even be aware that it exists. I would try to avoid using it for anything that is not specifically asking for it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Question About Ballistics App and Kestrel
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