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 November 8, 2017, 10:30 PM #1 TXAZ Senior Member   Join Date: September 5, 2010 Location: Cyber-Texas Posts: 2,962 How high will the bullet go if fired upward? Someone asked the question, "How high will the bullet go if shot straight up?? In a vacuum, it's an easy kinetic to potential energy calculation. (1/2mv^2 = mgh) But in reality I'm trying to get the Shooter app to tell me how high if shot vertically, but it doesn't like that. Does anyone know how to get the Shooter or Ballistic AE app to calculate the maximum height of a 750 grain bullet fired at 2800 fps upwards? Thanks! __________________ أنا لست ارهابيا .50 BMG: 1 Shot 1 THRILL! Last edited by TXAZ; November 9, 2017 at 07:53 AM.
 November 8, 2017, 10:37 PM #2 rickyrick Senior Member   Join Date: March 15, 2010 Posts: 6,508 I member doing problems like that in physics class... the knowledge didn’t stick though. You could calculate for sure if you know all the variables. I bounced a 50cal tracer off of a tank and it went into some low clouds. So at least that far. I’m bored lol, sorry for not being any help.
 November 9, 2017, 03:21 AM #3 geologist Senior Member   Join Date: March 8, 2005 Location: BC, Canada Posts: 192 The bullet will decellerate due to the acceleration of the earths gravity which will vary depending on elevation. At sea level it will decellerate at 32 feet per second squared. It will also decellerate due to air resistance and this will vary with the djameter and shape of the bullet plus the density of air. There may also be a measurable deviation due to the Coriolis effect from the earths rotation. This may vary by latitude. So you will need to know the muzzle velocity and then decellerate the bullet due to gravity and air resistance until the velocity equals zero.
 November 9, 2017, 04:19 AM #4 ms6852 Senior Member   Join Date: April 3, 2010 Location: Texas Posts: 710 When I was in the Army we would no night qualifications with our m16's and use a lot of tracers. Often you would see some ricochet strait up to the sky high enough to bring a chopper or small plane flying before the tracer would burn out. Good question but I hated physics, loved geometry. __________________ ONLY TWO DEFINING FORCES HAVE GIVEN UP THEIR LIVES FOR YOU. ONE IS JESUS CHRIST FOR YOUR SOUL AND THE OTHER IS THE AMERICAN SOLDIER FOR YOUR FREEDOM.
November 9, 2017, 02:23 PM   #5
Robert.Greene
Junior Member

Join Date: August 27, 2013
Posts: 1
Quote:
 Originally Posted by TXAZ Someone asked the question, "How high will the bullet go if shot straight up?? In a vacuum, it's an easy kinetic to potential energy calculation. (1/2mv^2 = mgh) But in reality I'm trying to get the Shooter app to tell me how high if shot vertically, but it doesn't like that. Does anyone know how to get the Shooter or Ballistic AE app to calculate the maximum height of a 750 grain bullet fired at 2800 fps upwards? Thanks!
From your own equation, with muzzle speed of 2800 fps you get 37,123 m = 23.1 miles. Add in air friction, etc I'm guessing no more than 10-15mi? Still seems quite high.

 November 9, 2017, 02:24 PM #6 Buzzcook Senior Member   Join Date: November 29, 2007 Location: Everett, WA Posts: 6,040
 November 9, 2017, 02:37 PM #7 DMK Senior Member   Join Date: November 18, 2001 Location: Over the hills and far, far away Posts: 2,854 Wow, that's impressive. More than 9,000 feet of altitude for 30-06 and more than 4,000 feet of altitude for a 9mm. __________________ DMK - Homeland Security begins at home: Support your Second Amendment. - Remember to support friends who support us: http://www.gunowners.org/ - http://www.nra.org/ http://www.jpfo.org/ - http://keepandbeararms.com/ http://www.2asisters.org/ http://www.grnc.org/ - http://www.ncrpa.org/
 November 9, 2017, 02:40 PM #8 carguychris Senior Member   Join Date: October 20, 2007 Location: Richardson, TX Posts: 7,482 750gr @ 2,800 fps sounds like .50 BMG... I bet you could find some vintage U.S. military manuals with trajectory charts, as this was one of the most common anti-aircraft rounds before the transition to SAMs. __________________ "Smokey, this is not 'Nam. This is bowling. There are rules... MARK IT ZERO!!" - Walter Sobchak
 November 9, 2017, 04:04 PM #9 TracerTesterman Junior member   Join Date: November 9, 2017 Posts: 59 It would be hard to gauge a tracer distance, those little buggers like to zing off after a couple hundred rounds to go start a range fire on a berm in my experience. But interesting topic!
 November 9, 2017, 04:44 PM #10 RAEIndustries Member   Join Date: October 6, 2017 Location: Colorado Posts: 25 so the .50 would be substantially higher ?
 November 10, 2017, 02:47 AM #11 ShootistPRS Senior Member   Join Date: January 3, 2017 Posts: 1,571 It is actually just over 10000 feet. (10170.6367 feet) I don't have any model rockets that will go that high.
 November 10, 2017, 05:25 PM #12 TXAZ Senior Member   Join Date: September 5, 2010 Location: Cyber-Texas Posts: 2,962 Thanks to a fellow .50 shooter who has an app that does allow vertical shots, and takes BC, bullet weight, humidity and other factors into consideration, the answer is 3.27 miles. Straight up. 5262 meters, 17,266 feet. That corroborates with Barrett’s 7 mile max horizontal range and another less precise calculator. Thanks. __________________ أنا لست ارهابيا .50 BMG: 1 Shot 1 THRILL!
 November 10, 2017, 05:55 PM #13 rickyrick Senior Member   Join Date: March 15, 2010 Posts: 6,508 Crazy, and interesting.
 November 12, 2017, 05:28 PM #14 Archie Senior Member   Join Date: May 26, 2000 Location: Hastings, Nebrasksa - the Hear Posts: 2,153 As you may have guessed, the altitude achieved is directly related to the ballistic coefficient of the bullet, muzzle velocity, and climatic conditions. I recall Hatcher's Notebook, by Major General Julian S. Hatcher (USA) having some information, but that was in the 1910s and 1920s. Not sure if .50 BMG was mentioned. Based on experience with the Federal Government, I'll bet the information has been developed, measured, calculated or discovered on a Ouiji board by some agency or department. An Army manual more than likely lists it, but it would be titled something on the order of "Studies of Small Arms Ammunition Trajectories and Eccentricities for Range Designers" or similar. Good luck. __________________ There ain't no free lunch, except Jesus. Archie Check out updated journal at http://oldmanmontgomery.wordpress.com/
November 13, 2017, 10:29 AM   #15
carguychris
Senior Member

Join Date: October 20, 2007
Location: Richardson, TX
Posts: 7,482
Quote:
 Originally Posted by Archie An Army manual more than likely lists it, but it would be titled something on the order of "Studies of Small Arms Ammunition Trajectories and Eccentricities for Range Designers" or similar.
Although I'm kinda reiterating what I wrote earlier, I would recommend looking for vintage anti-aircraft field manuals.

I did 5 minutes of Googling after my prior post, and I managed to find some WWII-era manuals for 3" light AA artillery, complete with complex mathematical formulas and very detailed trajectory charts—stuff that no grunt operating the equipment would probably understand, and that would have required unrealistically advanced technology to use anyway (i.e. ranging radar and digital computers), but I digress.

I didn't find anything about .50 BMG, but it must be out there, possibly in Navy manuals, given that "quad 50" AA emplacements were installed on virtually every USN surface combatant at the time. I strongly suspect that the Navy would have considered the need to fire virtually straight up to counter dive-bombers.
__________________
"Smokey, this is not 'Nam. This is bowling. There are rules... MARK IT ZERO!!" - Walter Sobchak

 November 14, 2017, 06:56 PM #16 DaleA Senior Member   Join Date: September 12, 2002 Location: Twin Cities, MN Posts: 3,921 Whenever anybody mentions Naval anti-aircraft guns I think of this picture of the line up on the Essex class aircraft carrier USS Hornet from 1945. https://en.wikipedia.org/wiki/Oerlik..._20mm_1945.jpg
 November 14, 2017, 08:56 PM #17 Mal H Staff   Join Date: March 20, 1999 Location: Somewhere in the woods of Northern Virginia Posts: 15,612 The question has been answered by the OP - see post #12.

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