SpudFiles

Well, I finally got around to completing "hang time ballistics Live", a javascript program that calculates Muzzle velocity/hang time/Cd/Apogee of a projectile given some information.

For completeness, here are the input pairs and their outputs:

HangTime, Cd => search(Muzzle velocity), return(Appogee)
HangTime, Muzzle velocity => search(Cd), return(Apogee)
HangTime, Apogee => search(Cd,Muzzle velocity)
(HangTime-Apogee method not working well)

Cd, Muzzle velocity => return(HangTime, Apogee)
Cd, Apogee => search(muzzle velocity), return(hangtime)
Muzzle velocity, Apogee => search(Cd), return(hangtime)

Very cool, if you can use GGDT you can use this so it's not to difficult.

Seems pretty accurate to GGDT figures as well, nice stuff.

I just gave it a little go and I actually prefer it over GGDT its easier and just as accurate

looks good but what is apogee i googled it and it came up with a wiki page talking about orbiting and stuff

http://en.wikipedia.org/wiki/Apogee

edit: and do you have any idea how aerodynamic an airsoft bb is (6mm)?

edit 2: this page says it is 0.47 Cd http://www.arniesairsoft.co.uk/?filnavn ... t_time.htm

and your calcuator says i will be able to shoot a .43 sniper bb (6mm) ~130m and have an impact velocity of 22m/s which is nothing although if i shot a lightweight air rifle pellet with a better Cd then i could have massive ranges

This is a very nice and simple program. The only complaint I see is the fact that I have to convert from English to Metric, but that is really no big deal.

Good job.

ALIHISGREAT wrote:looks good but what is apogee i googled it and it came up with a wiki page talking about orbiting and stuff

in this case it refers to the peak of the projectile's trajectory.

in this case it refers to the peak of the projectile's trajectory

so its not the range then?

no, it's the point between the projectile stopping its upward travel and beginning its descent back to earth.

jackssmirkingrevenge wrote:no, it's the point between the projectile stopping its upward travel and beginning its descent back to earth.

so the calculator is assuming you are firing at a 45 degree angle then?

No, it assumes you are firing at an angle between 1 and 90 degrees.

i.e 'up'.

Do you know what a parabola is? Well the apogee is the height of the parabola of the projectiles travel.

From Webster:


Main Entry:
apo·gee
1: the point in the orbit of an object (as a satellite) orbiting the earth that is at the greatest distance from the center of the earth; also : the point farthest from a planet or a satellite (as the moon) reached by an object orbiting it — compare perigee
2: the farthest or highest point : culmination <Aegean>
— apo·ge·an Listen to the pronunciation of apogean \ˌa-pə-ˈjē-ən\ adjective

should there be something under the top box on the right because its blank for me with a funny symbol in the middle?

ALIHISGREAT wrote:should there be something under the top box on the right because its blank for me with a funny symbol in the middle?

???

i think there s meant to be a graph there or something but for me there isn't which is slightly annoying

If you are referring to my post, there was no graph. If you are referring to anyone elses post (which you have to be if you are not talking about mine) then I see no graph either.