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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
WildcatBullet 338 cal 350 gr elevation at 2000 yards ???
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<blockquote data-quote="DANTEC" data-source="post: 65884" data-attributes="member: 685"><p>I not agree with you </p><p></p><p>if you plan to measure ( metrolgy operation and not pretty display on a computer because display on a computer is NOT a true thing EXCEPT after to have check all step of the measure from adta aquisition , to A/D conversion to final sofware equation checking and software programming )</p><p>a velocity with a oehler 43 ( sound target ) you perhaps need to be sure of all atmospheric parameters because speed of the sound vary with air density </p><p>you need to carefully calibrate your sound target system for the velocity you want to catch because subsonic fly noise , transonic fly noise , supersonic fly is not the same </p><p>you need to calibrate to your sound target for bullet location and be sure than your measurement map give you the same reading data , so at 2000 yards where you shoot in your target ??? </p><p>you need too to carefully check your instrumental velocity to the bullet velocity ( not really the same if you plan to reach the real accuracy in measurement )</p><p></p><p>now on my idea to compare things to things </p><p></p><p>you shoot at a know distance with a know bullet ( BC ) launch at a know velocity in a know atmospheric conditions </p><p>you get a elevation ( on turret ) to reach your target </p><p>all of that are true fact , parameters as tail wind ... can be forget ) </p><p>you do another trails with another bullet</p><p>change is only bullet and velocity but you can record all parameters EXCEPT bullet BC so you can by computation get an good idea of the bc of the bullet you have shoot </p><p></p><p>and by computation you can find you BC bullet IF all your fly is in true supersonic velocity to stay in the straight aera of your drag curve and avoid transonic aera </p><p></p><p>as Dopller story/myth /dream/myhery </p><p></p><p>Doppler is costly to use that a fact </p><p>Dopler data need to be post compute by a software as PRODAS ( another $$$$$$ piece of equipement ) to get BC data and usefull data because raught dopller data is just a numerical file without any use without post computing </p><p>Dopler data need to be use ONLY by qualified engineer to not spread internet with dummy value or magic results </p><p></p><p>so to make a conclusion logic and engineering view of problem can allow to make pretty accurate thing without million of $ of equipement </p><p></p><p>as equipment I use I use impact target ( piezo sensor and measure time of fly between the muzzle and my impact , transmision time is calibrated with a 100 Mhz pulse generator to measure how much time my impact target signal ( during data acquisition and after data aquisition ) take to come back to my computer </p><p></p><p>I have more fun to make field instrumention than to make noise with costly shinny rifle and I am interesting first by true enegineering speaking .</p><p></p><p>good shooting </p><p></p><p>DAN TEC</p></blockquote><p></p>
[QUOTE="DANTEC, post: 65884, member: 685"] I not agree with you if you plan to measure ( metrolgy operation and not pretty display on a computer because display on a computer is NOT a true thing EXCEPT after to have check all step of the measure from adta aquisition , to A/D conversion to final sofware equation checking and software programming ) a velocity with a oehler 43 ( sound target ) you perhaps need to be sure of all atmospheric parameters because speed of the sound vary with air density you need to carefully calibrate your sound target system for the velocity you want to catch because subsonic fly noise , transonic fly noise , supersonic fly is not the same you need to calibrate to your sound target for bullet location and be sure than your measurement map give you the same reading data , so at 2000 yards where you shoot in your target ??? you need too to carefully check your instrumental velocity to the bullet velocity ( not really the same if you plan to reach the real accuracy in measurement ) now on my idea to compare things to things you shoot at a know distance with a know bullet ( BC ) launch at a know velocity in a know atmospheric conditions you get a elevation ( on turret ) to reach your target all of that are true fact , parameters as tail wind ... can be forget ) you do another trails with another bullet change is only bullet and velocity but you can record all parameters EXCEPT bullet BC so you can by computation get an good idea of the bc of the bullet you have shoot and by computation you can find you BC bullet IF all your fly is in true supersonic velocity to stay in the straight aera of your drag curve and avoid transonic aera as Dopller story/myth /dream/myhery Doppler is costly to use that a fact Dopler data need to be post compute by a software as PRODAS ( another $$$$$$ piece of equipement ) to get BC data and usefull data because raught dopller data is just a numerical file without any use without post computing Dopler data need to be use ONLY by qualified engineer to not spread internet with dummy value or magic results so to make a conclusion logic and engineering view of problem can allow to make pretty accurate thing without million of $ of equipement as equipment I use I use impact target ( piezo sensor and measure time of fly between the muzzle and my impact , transmision time is calibrated with a 100 Mhz pulse generator to measure how much time my impact target signal ( during data acquisition and after data aquisition ) take to come back to my computer I have more fun to make field instrumention than to make noise with costly shinny rifle and I am interesting first by true enegineering speaking . good shooting DAN TEC [/QUOTE]
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WildcatBullet 338 cal 350 gr elevation at 2000 yards ???
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