[adibs3]

Hey everyone! Has anyone on this site done air drag and trajectory calculations for airsoft bbs? (not counting spin of course). I have been doing some today, it could be useful information. Let me know if you guys are interested.:tup:

 

[DillSS]

ATP - The Airsoft Trajectory Project

Old stuff but still good stuff

 

[adibs3]

Hey thank you! I really appreciate this.

 

[TacticalBeard]

This study is pretty sweet! If you look at the range with hop up though, the range is not as great as some of us because of the older hop designs... Also, I dont think the air volume was properly balanced with barrel lenght for each bb, though it may be possible but I doubt so. Still cool though.

 

[adibs3]

Yea, I figured. But you know, good to get a ballpark on building rifles anyhow.

 

[careful]

This study is pretty sweet! If you look at the range with hop up though, the range is not as great as some of us because of the older hop designs... Also, I dont think the air volume was properly balanced with barrel lenght for each bb, though it may be possible but I doubt so. Still cool though.

These numbers are fairly close. Air volume balancing has nothing to do with range(it determines efficiency and to an extent, accuracy), nor does hop up design affect range provided the hop up system is capable of providing adequate backspin.

 

[Reliku]

The numbers are fairly accurate I'd say as well but how you actually set your hopup and how you've got your scope zero'ed determines a lot about the range you will get. Or rather, the range you think you will get. Overhold and overhop or the absence of those can make quite the difference.

If you look at the trajectory of the .43g bb's at the 2.81J page, you will see that it goes up right away. This means the maximum potential of the backspin is not achieved, you could get further with more backspin and by aiming down a little, for example. It all depends on hopup setting and how the scope was zero'ed.

A bb will only fly absolutely straight for a certain distance. Even hot guns with heavy ammo will not shoot a flat trajectory at 100 yards. These graphs try to get a flat trajectory and thus actual range is not maximized, which explains the difference

But in the end, assuming the system can put enough backspin on the bb and the hop setting and zeroing is identical, muzzle energy and bb weight are the only two variables determining the actual distance the bb's will fly.

 

[Echorider]

Then let me ask this; i noticed after losing my flat hop patch while modding my hopup arm, that i know get a much more reliable flight path, with less hop. Same nub, same pressure, greater distance, more accuracy. i can hit a man sized target at 280 reliably now. 7/10 shots. is that because the flat hup was causing a negative effect on the hop of the bb?

 

[Reliku]

It was more likely that the flat hop was installed incorrectly (if part of the original mound shows in the hop window then you will lose consistency).

Flat hop and similar mods are popular because they increase consistency. The trajectory is the same vs other types of hopup but bb's shot out of a flat hop setup tend to deviate less. But it depends on many more factors, though.

Flat hop is better than normal hop, normally speaking, but if something went wrong during your first install then that would be your likely explanation why you are seeing better results now :tup: